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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K/A

Amendment No. 1

(Mark One)

For the fiscal year ended January 31, 2011

OR

Commission File Number: 001-32224

salesforce.com, inc.

(Exact name of registrant as specified in its charter)

The Landmark @ One Market, Suite 300

San Francisco, California 94105

(Address of principal executive offices)

Telephone Number (415) 901-7000

(Registrant’s telephone number, including area code)

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

Securities registered pursuant to section 12(g) of the Act:

Not applicable

Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  x    No  ¨

Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or Section 15(d) of Act.    Yes  ¨    No  x

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 whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

        Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (Section 229.405 of this chapter) 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 a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

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

Based on the closing price of the Registrant’s common stock on the last business day of the Registrant’s most recently completed second fiscal quarter, which was July 31, 2010, the aggregate market value of its shares (based on a closing price of $98.95 per share) held by non-affiliates was approximately $11.7 billion. Shares of the Registrant’s common stock held by each executive officer and director and by each entity or person that owned 5 percent or more of the Registrant’s outstanding common stock were excluded in that such persons may be deemed to be affiliates. This determination of affiliate status is not necessarily a conclusive determination for other purposes.

As of January 31, 2011, there were approximately 132.9 million shares of the Registrant’s Common Stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Registrant’s definitive proxy statement for its 2011 Annual Meeting of Stockholders (the “Proxy Statement”) are incorporated by reference in Part III of this Report on Form 10-K. Except with respect to information specifically incorporated by reference in this Form 10-K, the Proxy Statement is not deemed to be filed as part of this Form 10-K.

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salesforce.com, inc.

INDEX

EXPLANATORY NOTE

This Amendment No. 1 (“Amendment”) on Form 10-K/A amends the annual report on Form 10-K of salesforce.com, inc. (the “Company”) for the period ended January 31, 2011, as filed with the Securities and Exchange Commission (the “Commission”) on March 23, 2011 (the “Form 10-K”).

This Amendment is an exhibit-only filing solely for the purpose of filing revised Exhibits 10.18, 10.19 and 10.20 in connection with the conclusion of the confidential treatment process. No revisions are being made to the Company’s financial statements and this Amendment does not reflect events occurring after the filing of the Form 10-K, or modify or update those disclosures that may be affected by subsequent events, and no other changes are being made to any other disclosure contained in the Form 10-K.

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Part IV

Item 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(b) Exhibits. The exhibits listed below in the accompanying “Index to Exhibits” are filed or incorporated by reference as part of this Amendment.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Dated: June 24, 2011

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

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Index to Exhibits

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