Exhibit 99.4

EARTHLINK, INC.

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

The following unaudited pro forma condensed combined financial statements are based on the historical financial statements of EarthLink, Inc. (“EarthLink”), One Communications Corp. (“One Communications”) and ITC^DeltaCom, Inc. (“ITC^DeltaCom”) after giving effect to: EarthLink’s acquisition of One Communications on April 1, 2011; EarthLink’s acquisition of ITC^DeltaCom on December 8, 2010; and the application of the assumptions, reclassifications and adjustments described in the accompanying notes to the unaudited pro forma condensed combined financial statements.

The unaudited pro forma condensed combined balance sheet as of December 31, 2010 is presented as if the acquisition of One Communications had occurred on December 31, 2010. The unaudited pro forma condensed combined statement of operations for the year ended December 31, 2010 is presented as if the acquisitions of One Communications and ITC^DeltaCom had occurred on January 1, 2010.

The historical consolidated financial information has been adjusted to give effect to pro forma events that are (i) directly attributable to the transaction, (ii) factually supportable and (iii) with respect to the statement of operations, expected to have a continuing impact on the combined results. The unaudited pro forma condensed combined financial statements should be read in conjunction with the historical consolidated financial statements and accompanying notes of EarthLink and ITC^DeltaCom included in their respective Annual Reports on Form 10-K and with the historical consolidated financial statements and accompanying notes of One Communications as filed in EarthLink’s Current Report on Form 8-K on June 16, 2011.

The unaudited pro forma condensed combined financial statements have been presented for informational purposes only. The unaudited pro forma condensed combined financial statements are not intended to represent or be indicative of what the combined company’s results of operations or financial position that would have reported had the acquisition been completed as of the dates presented, and should not be taken as a representation of the combined company’s future consolidated results of operations or financial position. The unaudited pro forma condensed combined financial statements do not reflect any operating efficiencies and cost savings that may be achieved with respect to the combined companies or the costs necessary to achieve these cost savings and operating synergies.

The unaudited pro forma condensed combined financial statements have been prepared using the acquisition method of accounting. The preliminary allocation of the purchase price used in the unaudited pro forma condensed combined financial statements is based upon preliminary estimates. These preliminary estimates and assumptions are subject to change during the measurement period (up to one year from the acquisition date) as EarthLink finalizes the valuations of the net tangible and intangible assets acquired in connection with the acquisition.

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EARTHLINK, INC.

UNAUDITED PRO FORMA CONDENSED COMBINED BALANCE SHEET

AS OF DECEMBER 31, 2010

The accompanying notes are an integral part of these pro forma condensed combined financial statements.

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EARTHLINK, INC.

UNAUDITED PRO FORMA CONDENSED COMBINED STATEMENTS OF OPERATIONS

FOR THE YEAR ENDED DECEMBER 31, 2010

The accompanying notes are an integral part of these pro forma condensed combined financial statements.

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EARTHLINK, INC.

NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

1.  Basis of Presentation

The unaudited pro forma condensed combined financial statements are based on the historical financial statements of EarthLink, Inc. (“EarthLink”), One Communications Corp. (“One Communications”) and ITC^DeltaCom, Inc. (“ITC^DeltaCom”) after giving effect to: (1) EarthLink’s acquisition of One Communications on April 1, 2011; (2) EarthLink’s acquisition of ITC^DeltaCom on December 8, 2010; and (3) application of the assumptions, reclassifications and adjustments described in the accompanying notes to the unaudited pro forma condensed combined financial statements.

The unaudited pro forma condensed combined balance sheet as of December 31, 2010 is presented as if the acquisition of One Communications had occurred on December 31, 2010. The unaudited pro forma condensed combined statement of operations for the fiscal year ended December 31, 2010 is presented as if the acquisitions of ITC^DeltaCom and One Communications had occurred on January 1, 2010.

The unaudited pro forma condensed combined financial statements should be read in conjunction with the historical consolidated financial statements and accompanying notes of EarthLink and ITC^DeltaCom included in their respective Annual Reports on Form 10-K and with the historical consolidated financial statements and accompanying notes of One Communications as filed in EarthLink’s Current Report on Form 8-K on June 16, 2011.

The unaudited pro forma condensed combined financial statements have been presented for informational purposes only. The unaudited pro forma condensed combined financial statements are not intended to represent or be indicative of what the combined company’s results of operations or financial position that would have reported had the acquisition been completed as of the dates presented, and should not be taken as a representation of the combined company’s future consolidated results of operations or financial position. The unaudited pro forma condensed combined financial statements do not reflect any operating efficiencies and cost savings that may be achieved with respect to the combined companies or the costs necessary to achieve these cost savings and operating synergies.

The unaudited pro forma condensed combined financial statements were prepared using the acquisition method of accounting. As such, identifiable assets acquired and liabilities assumed are recognized at fair value as of the acquisition date. Goodwill as of the acquisition date is measured as the excess of consideration transferred and the net amounts of the identifiable assets acquired and the liabilities assumed.

EarthLink has made significant assumptions and estimates in determining the preliminary estimated purchase price and the preliminary allocation of the estimated purchase price in the unaudited pro forma condensed combined financial statements. These preliminary estimates and assumptions are subject to change during the measurement period (up to one year from the acquisition date) as EarthLink finalizes the valuations of the intangible assets and net tangible assets and resulting goodwill. In particular, the final valuations of identifiable intangible and net tangible assets may change significantly from EarthLink’s preliminary estimates. These changes could result in material variances between EarthLink’s future financial results and the amounts presented in these unaudited pro forma condensed combined financial statements, including variances in fair values recorded, as well as expenses and cash flows associated with these items.

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EARTHLINK, INC.

NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

2.  Description of Transactions

One Communications

On April 1, 2011, EarthLink completed its acquisition of One Communications, a privately-held, multi-regional integrated telecommunications solutions provider serving customers in the Northeast, Mid-Atlantic and Upper Midwest. EarthLink acquired 100% of One Communications in a merger transaction with One Communications surviving as an indirect wholly-owned subsidiary of EarthLink. One Communications stockholders had the right to elect to receive the net merger consideration in the form of cash or EarthLink common stock.

Pursuant to the terms of the merger agreement, the aggregate merger consideration for One Communications was $370.0 million, which included repayment of net indebtedness of approximately $282.1 million and $40.6 million of other liabilities and certain working capital and other adjustments as provided in the merger agreement. In addition, $21.0 million of the aggregate merger consideration was deposited in an escrow account to secure potential post-closing adjustments to the aggregate consideration relating to working capital and other similar adjustments, indemnification obligations and post-closing One Communications employment-related obligations.

The resulting preliminary fair value of consideration transferred was $47.4 million, which consisted of $23.8 million in cash paid to acquire the outstanding common stock of One Communications and $23.6 million for the issuance of 3.0 million shares of EarthLink common stock. The assets acquired and liabilities assumed of One Communications will be recognized at their acquisition date fair values.  The allocation of the consideration transferred to the assets acquired and liabilities assumed of One Communications (and the related estimated lives of depreciable tangible and identifiable intangible assets) will require a significant amount of judgment.

The following is a preliminary allocation of the consideration transferred based on currently available information.  Such final identification of all the intangible assets acquired and the purchase price allocation may be significantly different than that reflected below (dollars in thousands).

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EARTHLINK, INC.

NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

The following table summarizes the preliminary components of intangible assets acquired in connection with the One Communications acquisition (in thousands):

EarthLink has evaluated and continues to evaluate pre-acquisition contingencies relating to One Communications that existed as of the acquisition date. EarthLink continues to gather information for and evaluate substantially all pre-acquisition contingencies that it has assumed from One Communications. If EarthLink makes changes to the amounts recorded or identifies additional pre-acquisition contingencies during the remainder of the measurement period, such amounts recorded will be included in the purchase price allocation during the measurement period and, subsequently, in EarthLink’s results of operations.

ITC^DeltaCom

On December 8, 2010, EarthLink acquired ITC^DeltaCom, a provider of integrated communications services to customers in the southeastern U.S., at a price of $3.00 per share. EarthLink acquired 100% of ITC^DeltaCom in a merger transaction with ITC^DeltaCom surviving as a wholly-owned subsidiary of EarthLink.

The fair value of consideration transferred was $253.8 million, which consisted of $251.4 million in cash paid to acquire the outstanding common stock of ITC^DeltaCom and $2.3 million for the fair value of restricted stock units assumed and converted. In allocating the consideration transferred based on estimated fair values, EarthLink recorded $170.1 million of goodwill, $131.2 million of identifiable intangible assets, $200.5 million of property and equipment, $351.2 million of long-term debt and $103.2 million of other net assets. The Company allocated the consideration transferred to the tangible assets, liabilities and intangible assets acquired based on their estimated fair values. The excess of the consideration transferred over those fair values was recorded as goodwill.

3.  Reclassifications

Certain reclassifications have been made to conform One Communications’ historical amounts to EarthLink’s presentation.  These reclassifications consisted of the following:

·      One Communications due from related parties of $0.7 million as of December 31, 2010 was reclassified as other current assets.

·      One Communications long-term deferred revenue of $10.7 million as of December 31, 2010 was reclassified as other long-term liabilities.

·      One Communications gain on disposition of property and equipment of $0.6 million during the year ended December 31, 2010 was reclassified as selling, general and administrative expenses.

·      One Communications other operating income of $0.3 million during the year ended December 31, 2010 was reclassified as selling, general and administrative expenses.

·      One Communications total other expense, net, of $54.8 million during the year ended December 31, 2010 was reclassified as interest expense and other, net.

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EARTHLINK, INC.

NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

4.  Pro Forma Adjustments

The pro forma adjustments included in the unaudited pro forma condensed combined consolidated financial statements are as follows:

(a)          To record the following adjustments to cash and cash equivalents (in thousands):

(b)           To record the difference between the preliminary estimated fair value and the historical amount of One Communications’ accounts receivable.

(c)           To record the difference between the preliminary estimated fair value and the historical amount of certain prepaid assets and other long-term assets of One Communications, primarily related to the write-down of deferred customer costs and the deferred gain from sale of a business.

(d)           To record preliminary tax adjustments related to the One Communications acquisition (in thousands):

The preliminary net increase in deferred income tax liabilities is primarily attributable to acquired deferred tax liabilities associated with certain intangible assets acquired, which were partially offset by EarthLink’s ability to utilize certain net operating loss carryforwards from One Communications.

(e)           To record the difference between the preliminary estimated fair value and the historical amount of One Communications’ property and equipment.

(f)            To record the difference between the preliminary estimated fair value and the historical amount of One Communications’ intangible assets (in thousands):

Customer relationships represent the fair values of the underlying relationships and agreements with One Communications customers.  Developed technology represents the fair values of One Communications business processes and tools, patents and proprietary business methods related to the design and development of One Communications internally used software and technology. This proprietary know-how can be leveraged to develop new technology and improve EarthLink’s existing

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EARTHLINK, INC.

NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

technologies. Trade name represents the fair values of brand and name recognition associated with One Communications services.

(g)           To eliminate One Communications’ historical goodwill and record the preliminary estimated fair value of goodwill for the acquisition (in thousands):

Goodwill represents the excess of the purchase price of an acquired business over the fair value of the underlying net tangible and intangible assets.  Goodwill is not amortized, but rather is tested for impairment at least annually. In the event that EarthLink determines that the value of goodwill has become impaired, EarthLink will incur an accounting charge for the amount of impairment during the fiscal quarter in which such determination is made.

(h)           To record the difference between the preliminary estimated fair value and the historical amount of favorable and unfavorable indefeasible right-to-use agreements.

(i)            To record repayment of One Communications debt, including a $22.8 million decrease to the current portion of debt (including the One Communications’ interest rate swap agreement) and a $246.9 million decrease to long-term debt. Also to record the write-off $7.0 million of One Communications’ historical unamortized debt issuance costs included in other long-term assets.

(j)            To record a decrease of $23.1 million in other accrued liabilities consisting of a decrease of $22.6 million for the payment of One Communication accrued liabilities at the closing of the acquisition; an increase of $5.6 million for the difference between the preliminary estimated fair value and the historical amount of One Communications’ current liabilities that are determined to be probable and estimable as of the acquisition date; and a decrease of $6.1 million for accrued interest on One Communications debt that was repaid.

(k)           To record the difference between the preliminary estimated fair value and the historical amount of certain One Communications current and long-term deferred revenue.

(l)            To record the difference between the preliminary estimated fair value and the historical amount of One Communications’ other long-term liabilities that are determined to be probable and estimable as of the acquisition date, primarily related to lease-related liabilities.

(m)          To eliminate One Communications’ historical stockholders’ equity.

(n)           To record the issuance of 3.0 million shares of EarthLink common stock as follows:

(o)           To record the estimated stock-based compensation expense related to ITC^DeltaCom restricted stock units assumed in connection with the acquisition as they relate to postcombination services using the straight-line amortization method over the remaining requisite service periods and to remove historical stock-based compensation expense.

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EARTHLINK, INC.

NOTES TO UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

(p)           To record an increase in depreciation and amortization expense as follows:

·      an increase in amortization expense of $19.3 million based on the estimated fair value of acquired ITC^DeltaCom identifiable intangible assets over the estimated useful lives;

·      a decrease in depreciation expense of $2.1 million based on the estimated fair value of acquired ITC^DeltaCom property and equipment over the expected useful lives;

·      an increase in amortization expense of $1.7 million based on the estimated fair value of acquired One Communications’ identifiable intangible assets over the estimated useful lives; and

·      a decrease in depreciation expense of $3.7 million based on the estimated fair value of acquired One Communications’ property and equipment over the expected useful lives.

(q)           To eliminate acquisition-related costs of $28.9 million ($20.9 million for EarthLink and $8.0 million from ITC^DeltaCom) for the year ended December 31, 2010, as they reflect costs directly related to the merger, but do not have a continuing impact on the combined entity’s results of operations.

(r)            To record a $46.2 million decrease in interest expense and other, net, as follows:

·      a decrease of $40.9 million to eliminate historical interest expense of One Communications related to debt that was repaid at closing of the acquisition;

·      a decrease of $2.5 million to eliminate historical interest expense of ITC^DeltaCom related to the amortization of debt issuance costs and debt discount that were written off; and

·      a decrease of $2.8 million to record additional accretion for ITC^DeltaCom associated with the increase in debt to fair value of ITC^DeltaCom’s debt, which is being amortized over the remaining life of the long-term debt.

(s)           To record the pro forma tax impact at weighted average estimated income tax rates applicable to the jurisdictions in which the pro forma adjustments are expected to be recorded. The pro forma combined provision for income taxes does not reflect the amounts that would have resulted had EarthLink and One Communications filed consolidated income tax returns during the periods presented.

5.  Earnings per Share

The pro forma basic and diluted earnings per share amounts presented in the unaudited pro forma condensed combined statements of operations are based upon the weighted-average number of EarthLink common shares outstanding and are adjusted for the issuance of 3.0 million shares of common stock in connection with the acquisition of One Communications, which are assumed outstanding for all of 2010.

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