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SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-K

OR

Commission file number: 000-27723

SonicWALL, Inc.

(Exact name of registrant as specified in its charter)

1143 Borregas Avenue

Sunnyvale, California 94089

(408) 745-9600

fax: (408) 745-9300

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Securities registered pursuant to Section 12 (b) of the Securities Exchange Act of 1934:

Securities registered pursuant to Section 12 (g) of the Securities Exchange Act of 1934:

Common Stock (no par value)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  ¨

Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Act).    Yes  x    No  ¨

The aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant’s most recently completed second fiscal quarter (June 30, 2003), was $204,016,346. Shares of common stock held by each executive officer, director and each person who beneficially owns 5% or more of the outstanding common stock have been excluded because such persons may, under certain circumstances, be deemed to be affiliates. The determination of affiliate or executive officer status is not necessarily conclusive for other purposes.

The number of shares of the registrant’s common stock outstanding on February 27, 2004 was 71,087,963.

DOCUMENTS INCORPORATED BY REFERENCE

Certain portions of the registrant’s proxy statement for its 2004 annual meeting of shareholders are incorporated by reference into Part III of this Form 10-K.

CAUTIONARY NOTE ON FORWARD-LOOKING STATEMENTS

This Annual Report includes “forward-looking statements” within the meaning of Section 27A of the Securities Act and Section 21E of the 1934 Act. We intend that the forward-looking statements be covered by the safe harbor provisions for forward-looking statements in these sections. In some cases, you can identify forward-looking statements by terminology such as “may,” “will,” “could,” “expect,” “plan,” “anticipate,” “believe,” “estimate,” “predict,” “potential,” “intend” or “continue,” the negative of such terms or other comparable terminology. These statements are only predictions, reflecting our expectations for future events or our future financial performance. Actual events or results may differ materially. In evaluating these statements you should specifically consider various factors, including the risks outlined under “Risk Factors.” These factors may cause our actual results to differ materially from any forward-looking statement.

Although we believe that the expectations reflected in the forward-looking statements are reasonable, we cannot guarantee future results, levels of activity, performance or achievements. You should not place undue reliance on these forward-looking statements, which apply only as of the date of this Annual Report.

PART I

ITEM 1.    Business

Overview

SonicWALL designs, develops, manufactures and sells integrated network security, mobility, and productivity solutions for small to medium size networks used in enterprises, e-commerce, education, healthcare, retail/point-of-sale, and government markets. Our Internet security infrastructure products are designed to provide secure Internet access to both wired and wireless broadband customers, enable secure Internet-based connectivity for distributed organizations, and process secure transactions for enterprises and service providers. We believe our access security appliances provide high performance, robust, reliable, easy-to-use and affordable Internet firewall security and virtual private networking (“VPN”) functionalities. Additionally, our Internet security products are designed to make our customers more productive and more mobile, while still maintaining a high level of security. As of December 31, 2003, we have sold more than 450,000 of our Internet security appliances worldwide. We also sell value-added security application services for our access security appliances, including content filtering and anti-virus protection on an annual subscription basis. In addition, we sell licensed software packages such as our Global Management System (“GMS”) and our Global VPN Client. Our Global Management System enables distributed enterprises and service providers to manage and monitor a large number of SonicWALL Internet security appliances and deploy our security services from a central location to reduce staffing requirements, speed deployment and lower costs. Our Global VPN Client service provides mobile users with a simple, easy-to-use solution for securely accessing the network. Our transaction security products provide high performance Secure Sockets Layer (“SSL”) acceleration and offloading to enable service providers and enterprises to deploy e-commerce and web-based applications without degrading web server performance. Our products are primarily sold on an indirect basis through two-tiered distribution, first to distributors and then to value-added resellers, who then sell to end customers.

Our SonicWALL product line and associated service offerings provide our customers with comprehensive integrated security including firewall, VPN, anti-virus, content filtering and SSL encryption and decryption functionality, giving users affordable Internet security and secure Internet transactions. SonicWALL delivers appliance solutions that we believe are high performance, easy to install and cost-effective. With current suggested retail prices ranging from $445 to $15,995, our products are designed to assist customers to reduce life cycle costs for Internet security. By using an embedded single purpose operating system and a solid state hardware design without moving parts, our products maximize reliability and uptime. The SonicWALL access security products can be used in networks ranging in size from one to more than 15,000 users and are fully compatible with VPN technology industry standards.

SonicWALL was initially incorporated in California in 1991 as Sonic Systems. In August 1999, we changed our name to SonicWALL, Inc. References in this report to “we,” “our,” “us,” and “the Company” refer to SonicWALL, Inc. Our principal executive offices are located at 1143 Borregas Avenue, Sunnyvale, California 94089, and our telephone number is (408) 745-9600.

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Industry Background

Growth of Internet Usage and Acceptance

Businesses and consumers access the Internet for a wide variety of uses including communications, information gathering and commerce. Businesses and enterprises of all sizes have accepted the Internet as a critical yet affordable means of achieving global reach and brand awareness, allowing access and shared information among a large number of geographically dispersed employees, customers, suppliers and business partners. The Internet has become a particularly attractive solution for small and medium size businesses due to its cost effectiveness and ease-of-use. Larger enterprises also connect their internal networks to the Internet allowing for greater and quicker communications and expanded operations. Many of today’s larger enterprises also have branch offices, mobile workers and telecommuters who connect electronically to the corporate office and each other. The Internet has also become a vital tool of information access and communication for schools, libraries and other institutions.

Increasing Use of Broadband Access Technologies

The connection speed by which individuals and businesses and enterprises of all sizes connect to the Internet is increasing. Small to medium enterprises, branch offices and consumers are shifting from dial-up connections which offer a maximum connection rate of 56 kilobits per second to substantially faster, always-on broadband connections such as digital subscriber lines (“DSL”) and cable Internet access, which offer Internet connectivity rates up to 1 megabit per second. Larger enterprises have begun to move from T1 connectivity (1.5 megabits per second) to T3 connectivity (45 megabits per second), and in some cases to OC-3 connectivity (155 megabits per second). These broadband connections allow for exponentially faster Internet access among many simultaneous users. Additionally, as Internet access speeds increase, both network bandwidth and network traffic speeds have significantly increased, further reflecting the ubiquity and the importance of the Internet to business operations.

Importance of Internet Security

Internet security is essential for businesses and enterprises due to the large amount of confidential information transmitted or accessible over the Internet. Broadband technologies, including DSL and cable, are always connected to the Internet and increase the risk that proprietary data or other sensitive information might be compromised by computer hackers, identity thieves, disgruntled employees, contractors or competitors. In addition, business or enterprise data and networks become vulnerable to security threats or sophisticated attacks as the number of connections to the Internet increase, through satellite offices or telecommuters, and the volume of confidential information accessible through the Internet increases. Breaches of network security are costly to a business, both financially and from the lost productivity resulting from network and computer down-time. Businesses and enterprises are increasing their network security budget to address these concerns and to increase the confidence of users that transactions over the internet are secure.

The market for Internet security products includes a variety of applications to address network vulnerabilities and protect confidential data during transmission and access. These applications include, among others, firewalls, VPN access products, anti-virus solutions, content filtering and SSL encryption. According to International Data Corporation (“IDC”), the market for information security products is expected to grow from $19 billion in 2002 to $45 billion in 2007, representing annual growth of 19%. IDC also estimates that the market for firewall/VPN security appliances priced at less than $10,000 will have a compounded annual growth rate for revenue of 14% over the same period.

Acceptance of Firewall Solutions for Internet Security

As network connection speeds and bandwidth have increased, and as more complex forms of data are transmitted by and within businesses and enterprises, reliable security solutions have developed that emphasize high rates of data transfer, or throughput, while maintaining the integrity and security of network data. Businesses and enterprises of all sizes require a broad array of high-performance, cost-effective products to secure their networks, delivering firewall protection and VPN connectivity to both the central office headquarters and for the perimeter branch offices and telecommuters.

Hardware-based security appliances have overcome many of the shortcomings of software-based solutions. By contrast, software-based security solutions can be difficult to install and manage, often requiring dedicated and highly-skilled in-house information technology (“IT”) personnel. Additionally, software security solutions can be difficult to integrate within networks, often requiring installation of dedicated server equipment and the use of complex load balancing switches to ensure a reliable, high-speed connection. Hardware security solutions can overcome many of these limitations by integrating firewall, VPN, anti-virus and content filtering into one easy-to-deploy device that is interoperable with other Internet Protocol Security (“IPSec”) devices. These hardware solutions can remain current with automatic update services.

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Importance of Productivity and Mobility

As security becomes a more visible component of network IT spending, the demands of IT professionals to demonstrate a return on investment can influence the relative attractiveness of our solutions. This trend among our end users has encouraged us to develop and position our solutions with a distinctive productivity slant. For example, content filtering can be used in an office environment to prevent employees from surfing on shopping or sports sites during business hours in addition to blocking objectionable material. Additionally, as networks become more accessible to vendors, suppliers, customers, partners and employees on the road or at remote locations, the need for mobile solutions that are secure also increases. Our approach to mobility goes beyond the obvious wireless solutions that we offer. Remote secure access through VPN tunnels is a hallmark of our product line.

The Advent of Secure Virtual Private Networks (VPNs)

Large and small businesses and enterprises have begun to utilize VPNs in the place of more costly private, dedicated networks or leased lines. VPNs allow for two or more individual networks to be linked to create one large private network. The private network is “virtual” insofar as it leverages the public Internet as the network infrastructure. Businesses and enterprises use VPNs to achieve a variety of objectives. Telecommuters and traveling workers can access a corporate network to work from their out-of-office locations using remote access VPN. Satellite and branch offices can connect to the home office network using site-to-site VPNs. An enterprise can connect with its business partners, suppliers and customers utilizing an Extranet VPN. These VPN connections must be secure from unauthorized access and safe from unauthorized alteration. To secure a VPN, information traveling between the locations is encrypted and authenticated, typically using the IPSec protocol. To help deliver the desired quality and security levels, businesses and enterprises can monitor and prioritize network traffic for business-critical applications and allocate bandwidth for specific traffic, typically using customer premises equipment encryption and authentication products.

In a distributed business model, branch offices and point-of-sale (POS) locations extend a company’s reach into key markets, but that communication link must be available at all times and be able to support the businesses applications. VPN solutions help companies establish centralized control over branch offices, POS locations, or remote kiosks providing the robust security and performance needed for business continuance. Traditional site-to-site connections require companies to lease expensive, dedicated data lines that are difficult to deploy and manage. With the advent of affordable broadband and standards-based VPN, organizations can deploy secure remote access via ubiquitous Internet connections. With today’s VPN technology and broadband connections, companies of any size use the Internet to securely communicate with their multiple locations.

Increasing Need for Anti-Virus and Content Filtering Solutions

In the 2003 Computer Security Institute Computer Crime and Security Survey the two most common forms of attack or abuse reported were virus outbreaks and insider abuse of network access. Of the companies surveyed, 82% experienced virus outbreaks and 80% indicated insider abuse of network access. In addition to lost productivity, corporations and their customers and partners are vulnerable to severe financial losses. This reality has been underscored by the rapid infection of many users through widespread and highly publicized virus outbreaks affecting business networks around the globe. Companies’ concerns about issues such as employee productivity, legal liability and network bandwidth continue to fuel the growth of content filtering. As a result, enterprises are spending rapidly to deploy anti-virus protection and content filtering solutions across the enterprise and expending technical resources on an ongoing basis to keep these solutions updated against the latest virus threats and objectionable or inappropriate web content. IDC expects sales of secure content management, including anti-virus and content filtering products to increase from $3.3 billion in 2003 to $6.4 billion by 2007.

Increasing Use of SSL to Secure E-Commerce Transactions

SSL is the most widely used encryption technology for enabling the secure transmission of confidential data in web browser-based e-commerce transactions. Data encryption provided by SSL allows e-commerce vendors to build secure systems, and also provides the basis from which a business can build trust with customers, suppliers, partners and employees.

The growth of e-commerce on the Internet and the need for secure transactions has created increased loads on web servers, which are typically equipped with general purpose central processing units (“CPUs”). These servers were not designed to handle the extreme processing requirements of SSL transactions and as a result, their performance, as measured by the number of transactions per second (“TPS”) that can be processed simultaneously, declines considerably with the use of SSL. Studies show that server performance declines by over 90% when processing SSL transactions versus ordinary non-encrypted Internet traffic. The need to improve the performance of servers processing e-commerce transactions has typically been addressed by installing an SSL acceleration board within the server. While these solutions increase performance, they continue to utilize the host CPU for a portion of the transaction processing, and therefore do not fully optimize the server’s performance. A more effective solution is to install an Internet appliance that fully offloads and accelerates the SSL encryption and decryption processes, thereby leaving the server completely free to process the unencrypted portions of the transaction and all other traffic at maximum performance. In addition, as businesses utilize highly specialized network equipment, such as content switches, load balancers and caching appliances to provide maximum performance for high traffic web sites and Internet applications, they are also seeking specialized products to address SSL encryption and decryption acceleration and offloading within these network architectures.

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The SonicWALL Solutions

SonicWALL products are designed to provide comprehensive Internet security for (1) networks ranging in size from one to more than 15,000 users (2) enterprises utilizing branch offices, POS locations and (3) e-commerce applications that handle millions of secure transactions daily. Our access security products span a wide range of requirements, from single-user set-top appliances to rack-mounted enterprise-class units capable of supporting thousands of users. Our products vary with respect to the number of supported users, the number of transactions handled, the number of ports and feature options such as VPN, anti-virus protection and content filtering, as well as management tools that enable our customers to easily manage SonicWALL appliances installed throughout their networks. Our transaction security products include appliance-based solutions, which can be deployed in the most sophisticated networks requiring the highest levels of transaction performance. Our SSL appliances enable web sites to maintain optimal performance while processing a growing number of secure transactions.

In addition to serving the security needs of the small to medium businesses, SonicWALL access security products are a fully compatible, perimeter security solution for large, distributed enterprises and their branch offices, POS locations and telecommuters. Our access security products are designed to be fully compatible with industry VPN technology standards. SonicWALL transaction security products are an ideal solution for enterprises and service providers who are deploying high performance e-commerce applications.

As of December 31, 2003, we have sold more than 450,000 of our Internet security appliances worldwide. The SonicWALL product line provides our customers with the following key benefits:

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Strategy

Our goal is to extend our leadership position by continuing the transition from a single product firewall / VPN company to a comprehensive provider of integrated security, productivity and mobility solutions. We plan to accomplish our goal by focusing on Value Innovation, the process whereby we target the majority adopters of technology and deliver solutions with outstanding price-performance. This approach emphasizes time-to-mass market acceptance over pursuit of customers who are early technology adopters. Successful implementation of this approach requires a timely match between our customers’ requirements and feature integration within our platform.

Key elements of our strategy include:

Products and Services

SonicWALL provides comprehensive complete Internet security solutions that include access security and transaction security products, value-added security applications, and training, consulting and support services. Our access security product line provides cost effective and high performance Internet security solutions to small, medium and large enterprise customers in commercial, healthcare, education and government markets. Our transaction security products enable our target enterprise and service provider customers to process large volumes of secure transactions using SSL technology without compromising the performance of their e-commerce or e-business applications.

Our Global Management System (“GMS”) enables distributed enterprises and service providers to manage and monitor a large number of SonicWALL Internet security appliances and deploy our security services from a central location to speed deployment, reduce staffing requirements, speed deployment and lower costs.

Access Security Features

SonicWALL access security products include high performance, solid-state Internet security appliances that provide integrated security to meet the needs of the individual telecommuter through the large distributed enterprise. SonicWALL Internet security appliances share a common set of Internet security features that have been tailored to meet the needs of our target markets:

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Stateful Packet Inspection Firewall Security.    Our firewall technology protects private networks against Internet-based theft, destruction or modification of data, and automatically notifies customers if their networks are under attack. SonicWALL has been awarded the internationally recognized ICSA Firewall Certification. In addition, the firewall technology in our products detects and thwarts such “denial of service” attacks as “ping of death”, “SYN flood”, “LAND attack” and “internet protocol spoofing”.

Internet Protocol Address Management.    SonicWALL products also include Network Address Translation (“NAT”) and Dynamic Host Configuration Protocol (“DHCP”) client and server capabilities. NAT allows a customer to connect multiple users on their private network to the Internet using a single public IP Address. DHCP Client allows the appliance to automatically acquire its IP address settings from the Internet Service Provider (“ISP”). DHCP Server allows computers on the private network to automatically acquire IP address settings from the appliance, simplifying client personal computer configuration.

Web Browser-Based Management.    SonicWALL appliances are easily and securely configured and managed through a web browser-based interface. The SonicWALL interface effectively insulates the user from the underlying complexity of Internet security, while providing enough flexibility to meet the diverse needs of our customers.

Logging and Reporting.    SonicWALL appliances maintain an event log of potential security concerns, which can be viewed with a web browser or automatically sent on a periodic basis to any e-mail address. SonicWALL appliances notify the administrator of high-priority security issues, such as an attack on a server, by immediately sending an alert message to a priority e-mail account such as an e-mail pager. SonicWALL also provides pre-defined reports that show different views of Internet usage, such as the most commonly accessed web sites.

Internet Security Appliances

SonicWALL Internet security appliances vary with respect to the number of supported users, the number of ports, product features, processor speed and scalability. During 2003 we introduced a new generation of products including new PRO series appliances that are powered by our new SonicOS 2.0 operating system that is part of a complete, integrated security and productivity solution. We also introduced the SOHO TZW to meet the end user demand for convenient wireless connectivity.

SonicWALL’s line of Internet security appliances now include:

SonicWALL TELE3 SP/TELE3 SPi.    This Internet security appliance provides affordable, highly reliable Internet security and VPN connectivity through the utilization of an integrated analog modem. The SonicWALL TELE3 SP/TELE3 SPi features automated “fail-over” and “fail-back” technology to ensure that VPN connections are available even when the primary broadband connection fails. Both the TELE3SP and TELE3 SPi provide the functionality to choose between broadband and dial-up connectivity.

SonicWALL SOHO3.    This Internet security appliance provides a flexible and affordable Internet security solution for small business networks using broadband connections to the Internet. SonicWALL SOHO3 is available in 10-user, 25-user and 50-user models and can be upgraded to support unlimited users.

SonicWALL SOHO TZW.    This wireless Internet security appliance provides an affordable secure wireless gateway that integrates secure wireless, firewall, and VPN technologies in a single, easy-to-use solution, delivering the convenience and benefits of both wireless and wired connectivity. By enforcing the use of IPSec 3DES encryption on the Wireless Local-Area Network (“WLAN”) solid security is provided.

SonicWALL TZ 170.    This Internet security appliance provides a total security platform, delivering network security, flexibility and reliability to home, small, remote and branch offices. This high performance stateful packet inspection firewall ships in multiple node configurations and offers a choice between absolute ease of use for basic networks and ultimate flexibility for networks with more complex needs. The functionality of the TZ 170 is extended by the integrated 5-port medium dependent interface crossover (“MDIX”) switch allowing multiple computers to be networked together.

SonicWALL PRO 200 and SonicWALL PRO 230.    This Internet security appliance meets the security demands of medium to large networks and support up to 500 simultaneous VPN connections for remote offices or workers. The SonicWALL PRO 200 and SonicWALL PRO 230 allow companies to increase productivity by establishing secure VPN connections with business partners, branch offices, telecommuters and mobile users.

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SonicWALL PRO 3060.    This Internet security appliance provides a total security platform for complex networks, utilizing six fully configurable Ethernet interfaces to provide cost-effective, enterprise-class firewall throughput and VPN concentration. The PRO 3060 is powered by the SonicOS 2.0 firmware which provides hardware fail-over, wide-area network (“WAN”) ISP fail-over and an automated secondary VPN gateway, ensuring continuous network uptime. This product can support up to 128,000 concurrent sessions, 25 VPN client sessions for remote users and 500 to 1,000 VPN site-to-site connections.

SonicWALL PRO 4060.    This Internet security appliance provides all of the features of the PRO 3060, but increases the concurrent sessions to 500,000, VPN client sessions for remote users to 1,000 and VPN site-to-site connections to 3,000.

SonicWALL GX250.    This Internet security appliance is a high-bandwidth firewall and VPN solution for large enterprise installations and data centers. The 3U rack-mount Internet security appliance provides firewall protection with an ICSA-certified, stateful inspection firewall and integrated IPSec VPN connectivity. Built on an Application Specific Integrated Circuit (“ASIC”) security architecture, the GX250 delivers breakthrough performance supporting 200Mbps firewall throughput and up to 5,000 VPN tunnels. The GX250 ships with three FAST Ethernet 10/100 Base-TX interfaces.

SonicWALL GX650.    This Internet security appliance is SonicWALL’s highest performance firewall and VPN solution. The GX650 has all the features of the GX250, but increases firewall throughput to 1.4Gbps while increasing VPN connections to 10,000. This product ships with three Gigabit Ethernet 1000 Base-SX interfaces.

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Security Application Services

SonicWALL Internet security appliances integrate seamlessly with a comprehensive line of value-added security applications to provide a comprehensive Internet security solution. With SonicWALL’s integrated security applications, users can reduce the integration and maintenance problems that often result from sourcing, installing, and maintaining security products and services from multiple vendors.

SonicWALL Global VPN Client.    Our virtual private networking capabilities enable affordable and secure communications over the Internet between geographically dispersed offices, workers and partners. SonicWALL virtual private networking uses the industry standard IPSec protocol to deliver state-of-the-art security and interoperability with industry’s other virtual private networking products.

SonicWALL Content Filtering Service.    Our content filtering service enables businesses, families, schools and libraries to control access to objectionable or inappropriate web sites. SonicWALL can filter Internet content by uniform resource locator (“URL”), keyword or application type. We offer a content filter subscription service that provides a list of objectionable web sites that is automatically updated on an hourly basis.

SonicWALL Anti-Virus.    Our anti-virus subscription service can ease the challenges of installing and maintaining anti-virus protection throughout a business and across a distributed network. This SonicWALL service integrates with our security appliances to deploy and maintain anti-virus software for each user on the network without the need for desktop-by-desktop installation, configuration and maintenance. Automatic anti-virus updates insulate all network nodes from new virus outbreaks.

Transaction Security Products

Our transaction security products utilize SSL technology and high performance ASIC designs to provide the highest levels of performance and security for businesses and service providers. SonicWALL SSL products are capable boosting e-commerce web site performance up to 50 times by offloading the processing burden of SSL transactions. SonicWALL’s SSL products deliver industry-leading price/performance and transaction security for the enterprise, e-commerce and service provider markets.

SonicWALL SSL Appliances.    Our SSL appliances easily install in front of any web server or cluster tasked with secure transaction processing, and support up to 800 new SSL connections per second and up to 30,000 sustained SSL connections per second for high-demand SSL processing. The SSL appliances store up to 1,024 keys and certificates thereby providing web server independence and eliminating the need to configure secure processing properties on the host application. The SSL appliances include redundant power supplies and a fail-over port for high availability SSL processing.

Global Security Management Applications

Today, enterprises and service providers face an increasing need for security management throughout geographically distributed networks. As a distributed network grows and branches into multiple sub-networks linked by the Internet, so does the complexity of managing security policies. Geographically distributed networks represent a security challenge for the enterprise or service provider. A single flaw in security implementation at any remote location can expose the entire network infrastructure.

For network administrators, managing security for distributed networks on a site-by-site basis puts a big strain on resources. Visits to remote sites to setup security, inspect security installations, or provide training to local personnel is time consuming, expensive and unreliable. Administrators cannot be certain that every installation in the distributed network is complying with company security policies. To address these realities, SonicWALL’s solution for global security management is the Global Management System (“GMS”). This software application provides network administrators with configuration and management tools to globally define, distribute, enforce and deploy the full range of security application services and upgrades for thousands of SonicWALL Internet security appliances.

Customer Service and Technical Support

We offer our customers a comprehensive range of support programs that include electronic support, product maintenance and personalized technical support services on a worldwide basis. In 2003 a new support center was opened in Bangalore, India, to supplement the level of services we provide our global customers. We offer direct support to customers in North America, Europe, Japan and selected countries in Asia Pacific. Support services in other locations are provided through SonicWALL distributors. We now have five customer support centers located in Sunnyvale, California; Phoenix, Arizona; Boxtel, The Netherlands; Tokyo, Japan and Bangalore, India. Most of our technical support function in all locations is outsourced to third party service providers under agreements that may be cancelled upon advance written notice of either 90 or 180 days. Outsourcing our technical support enables us to reduce fixed overhead and personnel costs and allows us the flexibility to meet market demand. SonicWALL provides direct support for enterprise customers and certain channel partners who require custom services.

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Our standard service offerings include support which is available during normal business hours, as well as support services with access 24 hours a day, seven days a week. These support offerings provide replacement for failing hardware, telephone or web-based technical support and firmware updates. For large customers, alliance partners and Original Equipment Manufacturers (“OEMs”), SonicWALL also offers custom support agreements that may include additional features like dedicated technical account management, accelerated escalation and logistical support.

In 2003 we enhanced our electronic service delivery infrastructure with the implementation of an electronic knowledge base, on-line chat services and electronic training. These tools reduce overall service delivery costs and expand the capacity of SonicWALL technical resources. Purchased under an Application Service Provider (“ASP”) agreement with selected vendors, these services may be impacted in the event the providers prove unreliable.

Customers

We sell our products through distributors, resellers and original equipment manufacturers. As of December 31, 2003, we sold more than 450,000 Internet security appliances. The following lists our top international and domestic distributors based on revenues in the year ended December 31, 2003, and significant original equipment manufacturers.

End Users

Our products are sold by our channel partners to end users such as, financial institutions, retail outlets, professional offices, service providers, healthcare providers and educational and other public entities.

Sales and Marketing

Our sales and marketing efforts focus on successfully penetrating the small to medium size networks used in, enterprises, e-commerce, education, healthcare, and retail/point-of-sale markets. Our marketing programs promote SonicWALL brand awareness and reputation as a reliable, high performance, easy-to-use, and affordable Internet security appliance. We try to strengthen our brand through a variety of marketing programs which include on-going public relations, our web site, advertising, direct mail, industry and regional trade shows and seminars. We intend to continue expanding and strengthening our indirect channel relationships through additional marketing programs and increased promotional activities.

We believe that SonicWALL products are ideally suited for the indirect channel business model. We market and sell our products in this indirect channel through a two-tiered distribution structure consisting of distributors and resellers in the United States and over 50 other countries. Distributors and resellers accounted for approximately 96% of our total revenue for the year ended December 31, 2003. Resellers, which include systems integrators, ISPs, dealers, mail order catalogs and online catalogs, generally purchase our products from our distributors and then sell our products to end-users in our target markets.

We divide our sales organization regionally into three territories: the Americas; Asia Pacific (APAC); and Europe, the Middle East and Africa (EMEA). Regional sales representatives manage our relationships with our network of distributors, value-added resellers and customers, help our value-added reseller network sell and support key customer accounts, and act as a liaison between our value-added reseller network and our marketing organization. The regional sales representative’s primary responsibility is to help the indirect channel succeed and grow within the territory. We also have an internal sales staff that supports the indirect channel, and a telesales organization whose primary responsibility is selling products to our installed base.

Domestic Channel.    In the Americas, the primary distributors of our products to resellers are Ingram Micro and Tech Data. Ingram Micro accounted for approximately 23% of total revenue in 2003, 21% in 2002 and 27% in 2001. Tech Data accounted for approximately 20% of total revenue in 2003, 26% in 2002 and 19% in 2001.

Domestic resellers receive various benefits and product discounts depending on the level of purchases that the reseller commits to or achieves. Our basic reseller program offers access to privileged information and sales and marketing materials. We also offer a Medallion program, which extends those benefits by adding access to an expanded set of sales and marketing tools, as well as priority technical support. The top level is SonicWALL Gold Partner, where additional benefits such as sales leads, access to additional discounted demonstration units and market development funds are available. SonicWALL Reseller and Medallion resellers all source our products through a distributor.

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International Channel.    We believe there is a strong international market for our products. International sales represented approximately 30% of our total revenue in 2003, 34% in 2002 and 32% in 2001. Sales to Japan accounted for approximately 5%, 8% and 10% of total revenue in the years ended December 31, 2003, 2002 and 2001, respectively.

We direct substantially all of our international resellers to the appropriate distributor in each territory. We support our international distributors by offering customizable marketing materials, sales tools, leads, co-operative marketing funds, joint advertising, discounted demonstration units and training. We also participate in regional press tours, trade shows and seminars. Key international distributors include Tek Data Distribution in England, Canon Solutions in Japan and Tempest in Denmark.

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Original Equipment Manufacturer Channel.    We enter into select original equipment manufacturer relationships in order to take advantage of the channels of well-established companies that sell into our target markets. We believe these channels expand our overall market while having a minor impact on our own indirect channel sales. We currently have agreements to sell our products or services through two original equipment manufacturers. Cisco, a supplier of network infrastructure products, resells certain of our SSL products under its own name. 3Com, a provider of diversified networking and telecommunications equipment, resells certain products that we manufacture and design under its own name. The terms of our agreements with these customers are variable and can generally be cancelled under certain conditions. In the years ended December 31, 2003, 2002 and 2001, our original equipment manufacturer revenue accounted for approximately 4%, 9% and 12% of total revenue, respectively.

Technology

We have designed our SonicWALL products using a unique combination of proprietary and non-proprietary hardware and software that delivers comprehensive Internet security with what we believe is excellent ease-of-use and industry-leading price/performance.

Appliance Platforms

SonicWALL’s line of appliance platforms is currently based on several architectures. The SonicWALL TELE3 and SOHO3 hardware platforms are based on the Toshiba TX3927 RISC microprocessor and also features SonicWALL’s ASIC-based VPN acceleration hardware. This platform provides firewall performance of up to 75Mbps and 3DES VPN performance of up to 20Mbps. The SonicWALL TELE3 and SOHO3 also include two 10/100 Mbps Fast Ethernet ports. The SonicWALL PRO 200 and 230 platforms are based on Intel’s StrongARM RISC microprocessor and also features SonicWALL ASIC-based VPN acceleration hardware. This platform provides firewall performance of up to 100Mbps and 3DES VPN performance of up to 45Mbps. Each product includes three 10/100 Mbps Fast Ethernet ports. The SonicWALL GX250 and GX650 platform is based on Intel’s Pentium III microprocessor, includes high performance VPN hardware acceleration and is capable of firewall performance of up to 1.4Gbps and 3DES VPN performance of up to 270Mbps.

During 2003 SonicWALL introduced two new architectures. SonicWALL’s TZ170 series appliances are based on a highly integrated system-on-a-chip architecture which SonicWALL purchases from a third-party as an off-the-shelf component. The TZ170 products offer firewall performance up to 90 Mbps and 3DES VPN performance of up to 20 Mbps. The TZ170 products include seven 10/100 Fast Ethernet ports. SonicWALL’s PRO 3060 and PRO 4060 series appliances are based on Intel’s Pentium 4 architecture and include an auxiliary processor purchased from Cavium to provide cryptographic acceleration. The PRO 3060 and PRO 4060 products offer firewall performance up to 300 Mbps and 3DES VPN performance of up to 190 Mbps. The PRO 3060 and PRO 4060 products include six 10/100 Fast Ethernet ports.

The entire SonicWALL access security product line provides the following core features:

The SonicWALL access security product line offers the following options for device management:

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Security Applications

SonicWALL Internet Security Appliances integrate seamlessly with a comprehensive line of value-added security services to provide comprehensive Internet security. With SonicWALL’s integrated security services, companies avoid the integration and maintenance problems that often result from sourcing, installing, and maintaining security products from multiple vendors. Our security services are easily enabled on the base hardware platform via a software key.

Transaction Security Products

SonicWALL transaction security products boost web site performance by offloading all SSL processing from the web servers to a device optimized for handling SSL transactions. SonicWALL SSL products use a powerful onboard processor with SonicWALL’s proprietary embedded operating system to deliver a complete end-to-end security system. Our SSL products are capable of accelerating e-commerce web site performance up to 50 times at a fraction of the cost of installing new web servers. Storing up to 1,024 keys and certificates, SonicWALL SSL products provide complete web server independence for secure processing.

These rack mount or appliance form factor products are designed for data centers, e-commerce web hosting environments and enterprise networks. The SonicWALL SSL appliances have two 10/100 Mbps Fast Ethernet ports—one for network traffic and one for server traffic, and support up to 800 new SSL connections per second and up to 30,000 sustained SSL connections per second for high-demand SSL processing. They also include a fail-over port and redundant power supply for high availability SSL processing.

Research and Development

We believe that our future success will depend in large part on our ability to develop new and enhanced Internet security solutions and our ability to meet the rapidly changing needs of our target customers who have broadband access to the Internet. We focus our research and development on evolving Internet security needs. We have made substantial investments in hardware, firmware, and software, which are critical to drive product cost reductions and higher performance solutions.

Our research and development activities are conducted at our principal facilities in Sunnyvale, California. In 2003, 2002 and 2001 we incurred expenses, excluding amortization of stock-based compensation, of $19.9 million, $18.9 million and $21.3 million, respectively, on research and development activities.

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Competition

The market for Internet security products is worldwide and highly competitive. Competition in our market has increased over the past year, and we expect competition to further intensify in the future. There are few substantial barriers to entry, and additional competition from existing competitors and new market entrants will likely occur in the future.

Our competitors may be able to respond more quickly than we can to new or emerging technologies and changes in customer requirements. In addition, our current and future competitors may integrate security products into the infrastructure of their existing product lines, including operating systems, routers, and browsers, in a manner that may discourage users from purchasing the products and services we offer. Many of our current and potential competitors have greater name recognition, larger customer bases to leverage and greater access to proprietary technology, and could therefore gain market share to our detriment. In addition, our current and potential competitors may establish cooperative relationships among themselves or with third parties that may further enhance their resources. We expect additional competition as other established and emerging companies enter the Internet security market and new products and technologies are introduced.

Current and potential competitors in our markets include, but are not limited to the following, all of which sell worldwide or have a presence in most of the major markets for such products:

Proprietary Rights

We currently rely on a combination of patent, trademark, copyright and trade secret laws, confidentiality provisions and other contractual provisions to protect our proprietary rights. Despite our efforts to protect our proprietary rights, unauthorized parties may misappropriate or infringe on our patents, trade secrets, copyrights, trademarks, service marks and similar proprietary rights. We have an on-going patent disclosure and application process and we plan to aggressively pursue additional patent protection. Our pending patent applications may not result in the issuance of any patents. Even if we obtain such patents, that will not guarantee that our patent rights will be valuable, create a competitive barrier, or will be free from infringement. Furthermore, if any patent is issued, it might be invalidated or circumvented or otherwise fail to provide us any meaningful protection. We face additional risk when conducting business in countries that have poorly developed or inadequately enforced intellectual property laws. In any event, competitors may independently develop similar or superior technologies or duplicate the technologies we have developed, which could substantially limit the value of our intellectual property.

U.S. Government Export Regulation Compliance

Our products are subject to federal export restrictions on encryption strength. Federal legal requirements allow the export of any-strength encryption to designated business sectors overseas, including U.S. subsidiaries, banks, financial institutions, insurance companies and health and medical end users. We have obtained a federal export authorization that allows us to export encryption technology to commercial entities in approved countries. With these expanded export rights, we may export strong encryption to a wide range of foreign end-users, subject to limitations and record-keeping requirements. We require that our distributors understand these export requirements and comply with them in the sale and distribution of our products.

Manufacturing

We currently outsource our manufacturing to one contract manufacturer, Flash Electronics, under an agreement that may be cancelled upon 180 days prior notice by either party. Outsourcing our manufacturing enables us to reduce fixed overhead and personnel costs and to provide flexibility in meeting market demand.

We design and develop all the key components of our products, including printed circuit boards and software. In addition, we determine the components that are incorporated in our products and select the appropriate suppliers of these components. Product testing and burn-in are performed by our contract manufacturer using tests that we specify.

Information about Segments and Geographic Areas

Financial information relating to our segments and information on revenues generated in different geographic areas are set forth in Note 9, entitled “Segment Reporting,” of the Notes to Consolidated Financial Statements in Item 8 of this report. In addition, information regarding risks attendant to our foreign operations is set forth under the heading “RISK FACTORS” included later in this report.

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Employees

As of December 31, 2003, we had 346 employees. Of these, 156 were employed in sales and marketing, 45 in finance and administration, 116 in research and development and 29 in operations. We are not party to any collective bargaining agreements with our employees and we have not experienced any work stoppages. We believe we have excellent relations with our employees.

Where You Can Find More Information

We make our annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and all amendments to such reports filed pursuant to Section 13(a) or 15(d) of the Exchange Act, available free of charge on or through our Internet website located at www.sonicwall.com, as soon as reasonably practicable after they are filed with or furnished to the SEC.

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RISK FACTORS

You should carefully review the following risks associated with owning our common stock. Our business, operating results or financial condition could be materially adversely affected by any of the following risks. You should also refer to the other information set forth in this report and incorporated by reference herein, including our financial statements and the related notes. Given these risks and uncertainties, readers are cautioned not to place undue reliance on such forward-looking statements.

Rapid changes in technology and industry standards could render our products and services unmarketable or obsolete, and we may be unable to successfully introduce new products and services.

To succeed, we must continually introduce new products and change and improve our products in response to new competitive product introductions, rapid technological developments and changes in operating systems, broadband Internet access, application and networking software, computer and communications hardware, programming tools, computer language technology and other security threats. Product development for Internet security appliances requires substantial engineering time and testing. Releasing new products and services prematurely may result in quality problems, and delays may result in loss of customer confidence and market share. In the past, we have on occasion experienced delays in the scheduled introduction of new and enhanced products and services, and we may experience delays in the future. We may be unable to develop new products and services or achieve and maintain market acceptance of them once they have come to market. Furthermore, when we do introduce new or enhanced products and services, we may be unable to manage the transition from the older products and services to minimize disruption in customer ordering patterns, avoid excessive inventories of older products and deliver enough new products and services to meet customer demand.

We depend on two major distributors for a significant amount of our revenue, and if they or others cancel or delay purchase orders, our revenue may decline and the price of our stock may fall.

To date, sales to two distributors have accounted for a significant portion of our revenue. In 2003, approximately 96% of our sales were to distributors and resellers, and sales through Ingram Micro and Tech Data accounted for approximately 23% and 20% of our revenue, respectively. In 2002, approximately 91% of our sales were to distributors and resellers, and sales through Ingram Micro and sales to Tech Data accounted for approximately 21% and 26% of our revenue, respectively. In 2001, approximately 88% of our sales were to distributors, and sales through Ingram Micro and sales to Tech Data accounted for approximately 27% and 19% of our revenue, respectively. In addition, in 2003, 2002 and 2001, our top 10 customers accounted for 56% or more of total revenues. We anticipate that sales of our products to relatively few customers will continue to account for a significant portion of our revenue. Although we have limited one-year agreements with Ingram Micro and Tech Data and certain other large distributors, these contracts are subject to termination at any time. We cannot assure you that any of these customers will continue to place orders with us, that orders by these customers will continue at the levels of previous periods or that we will be able to obtain large orders from new customers. If any of the foregoing should occur, our revenues will likely decline and our business will be adversely affected. In addition, as of December 31, 2003, Ingram Micro and Tech Data represented approximately $1.3 million and $1.4 million of our accounts receivable balance, constituting 14% and 15%, of total receivables, respectively. The failure of any of these customers to pay us in a timely manner could adversely affect our balance sheet, our results of operations and our creditworthiness, which could make it more difficult to conduct business.

If we are unable to compete successfully in the highly competitive market for Internet security products and services, our business will fail.

The market for Internet security products is worldwide and highly competitive. Competition in our market has significantly increased over the past year, and we expect competition to further intensify in the future. There are few substantial barriers to entry, and additional competition from existing competitors and new market entrants will likely occur in the future. Current and potential competitors in our markets include, but are not limited to the following, all of which sell worldwide or have a presence in most of the major markets for such products:

Competitors to date have generally targeted the security needs of enterprises of every size with firewall, VPN and SSL products that range in price from approximately $250 to more than $30,000. We may experience increased competitive pressure on some of our products, resulting in both lower prices and gross margins. Many of our current or potential competitors have

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longer operating histories, greater name recognition, larger customer bases and significantly greater financial, technical, marketing and other resources than we do. In addition, our competitors may bundle products competitive to ours with other products that they may sell to our current or potential customers. These customers may accept these bundled products rather than separately purchasing our products. If any of the foregoing were to occur, our business could be adversely affected.

Average selling prices of our products may decrease, which may reduce our gross margins.

The average selling prices for our products may decline as a result of competitive pricing pressures, a change in our product mix, anticipation of introduction of new products, promotional programs and customers who negotiate price reductions in exchange for longer-term purchase commitments. For example during 2003, we experienced lower average selling prices in our SOHO, and PRO product lines due to rebates and incentives offered to our customers as well as a shift in mix between certain product lines. Together, these two factors reduced our overall average selling prices, and our product revenue for the year ended December 31, 2003 declined below the levels reached for the year ended December 31, 2002. In addition, competition has increased over the past year, and we expect competition to further increase in the future, thereby leading to increased pricing pressures. Furthermore, we anticipate that the average selling prices and gross margins for our products will decrease over product life cycles. We cannot assure you that we will be successful in developing and introducing on a timely basis new products with enhanced features, or that these products, if introduced, will enable us to maintain our average selling prices and gross margins at current levels. If the average selling prices of our products decline, our revenue will likely decline and our operating results will be adversely affected.

We have difficulty predicting our future operating results or profitability due to volatility in general economic conditions and the Internet security market and a shortfall in revenues may harm our operating results.

Overall weakness in the general economy and volatility in the demand for Internet security products are two of the many factors underlying our inability to predict our revenue for a given period. We base our spending levels for product development, sales and marketing, and other operating expenses largely on our expected future revenue. A large proportion of our expenses are fixed for a particular quarter or year, and therefore, we may be unable to decrease our spending in time to compensate for any unexpected quarterly or annual shortfall in revenue. As a result, any shortfall in revenue could adversely affect our operating results. For the year ended December 31, 2003, we reported a net loss of $17.7 million. We do not know if we will be able to achieve profitability in the future.

We offer retroactive price protection to our major distributors and if we fail to balance their inventory with end user demand for our products, our allowance for price protection may be inadequate. This could adversely affect our results of operations.

We provide our major distributors with price protection rights for inventories of our products held by them. If we reduce the list price of our products, our major distributors receive refunds or credits from us that reduce the price of such products held in their inventory based upon the new list price. As of December 31, 2003, we estimated that approximately $9.7 million of our products in our distributors’ inventory are subject to price protection, which represented approximately 10.3% of our revenue for the year ended December 31, 2003. We have incurred approximately $800,000 of credits under our price protection policies in 2003. Future credits for price protection will depend on the percentage of our price reductions for the products in inventory and our ability to manage the level of our major distributors’ inventory. If future price protection adjustments are higher than expected, our future results of operations could be materially adversely affected.

We are dependent on international sales for a substantial amount of our revenue. We face the risk of international business and associated currency fluctuations, which might adversely affect our operating results.

International revenue represented 30% of total revenue in 2003, 34% of total revenue in 2002 and 32% of total revenue in 2001. For the year ended December 31, 2003, revenue from Japan represented 5% of our total revenue, and revenue from all other international regions collectively represented approximately 25% of our total revenue. We expect that international revenue will continue to represent a substantial portion of our total revenue in the foreseeable future. Our risks of doing business abroad include our ability to maintain distribution relationships on favorable terms, and if we are unable to do so, revenue may decrease from our international operations. Because our sales are denominated in U.S. dollars, the weakness of a foreign country’s currency against the dollar could increase the price of our products in such country and reduce our product unit sales by making our products more expensive in the local currency. The weakened dollar could increase the cost of local operating expenses and procurement of raw materials to the extent we must purchase components in foreign currencies. Additionally, we have exposures to emerging market currencies, which can have extreme currency volatility. We are subject to the risks of conducting business internationally, including potential foreign government regulation of our technology, general geopolitical risks associated with political and economic instability, changes in diplomatic and trade relationships, and foreign countries’ laws affecting the Internet generally.

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Delays in deliveries from our component suppliers could cause our revenue to decline and adversely affect our results of operations.

Our products incorporate certain components or technologies that are available from single or limited sources of supply. Specifically, our products rely upon microprocessors from Motorola, Toshiba, IBM and Intel, security ASICs from HiFN and Broadcom and incorporate software products from third-party vendors. We do not have long-term supply arrangements with any vendor, and any disruption in the supply of these products or technologies may adversely affect our ability to obtain necessary components or technology for our products. If this were to happen, our product shipments may be delayed or lost, resulting in a decline in sales and a loss of revenue. In addition, our products utilize components that have in the past been subject to market shortages and price fluctuations. If we experience price increases in our product components, we will experience de