Exhibit 10.1

EQUITY COMMITMENT LETTER

April 4, 2011

Eagle Parent, Inc.

Element Merger Sub, Inc.

c/o Apax Partners, L.P.

601 Lexington Avenue, 53rd Floor

New York, New York 10022

Epicore Software Corporation

18200 Von Karman Avenue, Suite 1000

Irvine, CA 92612

Re:    Equity Financing Commitment

Ladies and Gentlemen:

This letter agreement sets forth the commitment of Apax Europe VII-A, L.P., Apax Europe VII-B, L.P., Apax Europe VII-1, L.P., and Apax US VII, L.P. (collectively, the “Investors”), subject to the terms and conditions hereof, to purchase, or cause an assignee permitted by Section 11 of this letter agreement to purchase, directly or indirectly, equity securities of Eagle Parent, Inc., a Delaware corporation (“Parent”). It is contemplated that pursuant to the Agreement and Plan of Merger (the “Merger Agreement”), dated as of the date hereof, among Parent, Epicore Software Corporation, a Delaware corporation (the “Company”) and Element Merger Sub, Inc., a Delaware corporation and wholly-owned subsidiary of Parent (“Acquisition Sub”), Parent shall acquire the Company through the merger of Acquisition Sub with and into the Company, with the Company as the surviving corporation (the “Merger”). Capitalized terms used but not otherwise defined herein shall have the meanings ascribed to them in the Merger Agreement. Reference is made to the letter agreement among the Investors, Parent and Activant to be entered into concurrently with this letter agreement that provides for the Investor to purchase, or cause the purchase, directly or indirectly, equity securities of Parent in connection with the execution and delivery of the Activant Merger Agreement (the “Activant Equity Commitment Letter”).

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(a) Upon the terms and subject to the conditions set forth herein, the Investors hereby collectively commit to purchase for cash, or cause an assignee permitted by Section 11 of this letter agreement to purchase for cash, directly or indirectly, at or immediately prior to the earlier of the Offer Closing or the Merger Closing an aggregate of $647 million of equity securities of Parent (the “Closing Commitment”), solely for the purpose of allowing Parent, Acquisition Sub and/or Activant Acquisition Sub (as applicable) (i) to fund a portion of the Aggregate Merger Consideration and, if applicable, the aggregate consideration in the Offer, as set forth in the Merger Agreement, and the aggregate Merger Consideration (as defined and as set forth in the Activant Merger Agreement), (ii) to pay related fees and expenses upon the consummation of the Merger, the Offer or the Activant Merger (as the case may be) and the transactions contemplated by the Merger Agreement and the Activant Merger Agreement and (iii) to repay or cause to be repaid indebtedness of the Company, Activant and their respective subsidiaries in accordance with the Merger Agreement and the Activant Merger Agreement (as applicable); provided, that the Closing Commitment shall be reduced to the extent any of the amounts set forth in the immediately foregoing sentence are paid to Parent at the Closing in accordance with the Activant Equity Commitment Letter. The total obligation of the Investors to fund in connection with the Merger Closing, the Offer Closing and the Closing (as defined in the Activant Merger Agreement) shall in no event exceed the Closing Commitment. The Investors may effect the purchase of equity securities of Parent directly or indirectly through one or more Affiliated entities. The obligation of the Investors to fund any portion of the Closing Commitment may be reduced by the Investors, immediately prior to the Effective Time, to the extent that Parent does not require the full amount of the Closing Commitment (x) to fund the payment of the obligations referenced in the first sentence of this Section 1(a) and (y) to satisfy each of the conditions set forth in the Debt Commitment Letter. Each Investor hereby confirms that it, or it together with any Affiliate to which its obligation to fund the Closing Commitment is assigned pursuant to Section 11, has and will maintain unfunded capital commitments in an amount not less than its Pro Rata Percentage (as defined below) of the aggregate Closing Commitment and no other approval is required for such Investor to fulfill its obligations hereunder. In lieu of purchasing equity securities of Parent, the Investors may satisfy its Closing Commitment in part by the purchase of debt securities of Parent if (and only if) (A) the purchase of such debt securities does not result in the failure of any condition under the financing contemplated by the Debt Commitment Letter and (B) the proceeds of such debt securities are contributed to Acquisition Sub as equity.

(b) The Investors’ obligations under this letter agreement to fund the Closing Commitment is subject to (i) the satisfaction or waiver by Parent (with the prior written approval of the Investors) of each of the conditions to Parent’s and Acquisition Sub’s obligations to consummate the Merger and the Offer, in each case, as contemplated by the Merger Agreement other than any conditions that by their nature are to be satisfied at the Merger Closing or Offer Closing (as applicable), but subject to the prior or substantially concurrent satisfaction of such conditions, (ii) the contemporaneous consummation of the Merger and, if applicable, the Offer in accordance with the terms of the Merger Agreement (including to the extent that the Company obtains, in accordance with the terms and subject to the satisfaction of the conditions set forth in Section 9.9(b) of the Merger Agreement, an order requiring Parent to specifically perform its obligations pursuant to the terms of the Merger Agreement to cause the financing of the Investors to be funded in connection with the consummation of the Merger), (iii) the execution and delivery of the Merger Agreement, (iv) the contemporaneous consummation of the Activant Merger in accordance with the terms of the Activant Merger Agreement (including to the extent that Activant obtains, in accordance with the terms and subject to the satisfaction of the conditions set

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forth in the Activant Merger Agreement, an order requiring Parent to specifically perform its obligations pursuant to the terms of the Activant Merger Agreement to cause the financing of the Investors to be funded in connection with the consummation of the Activant Merger), (v) the execution and delivery of the Activant Merger Agreement, and (vi) the consummation of the Debt Financing prior to, or substantially contemporaneously with, such funding by the Investors.

(c) The obligation of the Investors to fund, or cause the funding of, the Closing Commitment shall automatically and immediately terminate upon the earliest to occur of (i) the consummation of the Merger Closing (at which time the obligation shall be discharged), (ii) the valid termination of the Merger Agreement or the Activant Merger Agreement in accordance with their respective terms or (iii) the Company or any of its Affiliates, securityholders or agents asserting in any litigation or other proceeding, (A) any claim under or action with respect to the Investors funding the Termination Commitment (as such term is defined below) or (B) any other claim under or action against Parent or Acquisition Sub in connection with this letter agreement, the Merger Agreement, the Debt Commitment Letter or any transaction contemplated hereby or thereby or otherwise relating thereto, in each case of (A) and (B), other than Retained Claims, subject in each case to all of the terms, conditions and limitations herein and therein.

(a) Upon the terms and subject to the conditions set forth herein, the Investors hereby collectively commit to purchase for cash, or cause an assignee permitted by Section 11 of this letter agreement to purchase for cash, directly or indirectly, an aggregate amount of equity securities of Parent sufficient to allow Parent to pay (i) the Reverse Termination Fee, Special Termination Fee and Termination Fee (as defined in the Activant Merger Agreement) in accordance with the Merger Agreement and Activant Merger Agreement (as applicable) and any amounts payable pursuant to Section 6.13 and Section 8.3(a) of the Merger Agreement (collectively, the “Reimbursement Amounts”) and any such amounts payable pursuant to Section 4.3(c), Section 4.3(d) and Section 4.3(e) of the Activant Merger Agreement to the extent any payment obligations are due and payable by Parent pursuant to the terms and conditions of the Merger Agreement or Activant Merger Agreement, respectively, and subject to the limitations set forth therein (but without giving effect to any limitation or restriction imposed by Insolvency Proceedings (as such term is defined below) or related Laws), (ii) all fees and expenses incurred by Parent, Acquisition Sub and Activant Acquisition Sub in connection with the Merger Agreement and the Activant Merger Agreement (as applicable), and (iii) all other Liabilities of Parent, Acquisition Sub and Activant Acquisition Sub arising out of or relating to the Merger Agreement, the Activant Merger Agreement or the Offer (collectively, the “Termination Commitment,” and each of Parent’s, Acquisition Sub’s and Activant Acquisition Sub’s obligations set forth in clauses (i) through (iii) above, a “Termination Obligation,” and collectively, the “Termination Obligations”); provided, that the Company, Parent and Acquisition Sub hereby agree that the Investors shall in no event collectively be required to purchase, directly or indirectly, (x) more than $130 million of equity securities of Parent (or, in the case of each Investor, its Pro Rata Percentage (as such term is defined below) of such amount) in the event that the Reverse Termination Fee or Special Termination Fee, as applicable, and all Reimbursement Amounts are paid to the Company within the time period that such Reverse Termination Fee, Special Termination Fee or Reimbursement Amounts, as applicable, are required to be paid under the Merger Agreement and the Company is not legally compelled by a judicial order or otherwise to return any portion of such Reverse Termination Fee or Special Termination Fee, as applicable, or any Reimbursement Amount to Parent, Acquisition Sub or the Investors, or (y) more than $230 million of equity securities of Parent (or, in the case of each Investor, its Pro Rata Percentage (as such term is defined below) of such amount) in the event that the Reverse Termination Fee or

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Special Termination Fee, as applicable, and all Reimbursement Amounts are not paid to the Company within the time period that such Reverse Termination Fee, Special Termination Fee or Reimbursement Amounts, as applicable, are required to be paid under the Merger Agreement, or if the Company is legally compelled by a judicial order or otherwise to return any portion of such Reverse Termination Fee or Special Termination Fee, as applicable, or any Reimbursement Amount to Parent, Acquisition Sub or the Investors, in each case, under or in respect of the Termination Commitment, and that no Investor or Investor Affiliate (as such term is defined below), shall have any obligation or liability to any Person relating to, arising out of or in connection with, this letter agreement, other than as expressly set forth herein; provided, further, that the Termination Commitment will be reduced to the extent any payments are made to Parent in accordance with paragraph 2 of the Activant Equity Commitment Letter. For the avoidance of doubt, the Investors’ commitment to purchase equity securities of Parent pursuant to the first sentence of this Section 2(a) shall occur on such date or dates as the relevant Termination Commitments are due and payable by Parent or Acquisition Sub or Activant Acquisition Sub, as the case may be, pursuant to the terms and conditions of the Merger Agreement and the Activant Merger Agreement (as applicable) and without giving effect to any limitations or restrictions imposed by Insolvency Proceedings or related Laws.

For clarification purposes, whenever used herein, the “Reverse Termination Fee” and “Special Termination Fee” shall be determined after giving effect to any reduction thereto as provided in Sections 8.2 and 8.3(b) of the Merger Agreement.

(b) The obligation of the Investors to fund, or cause the funding of, the Termination Commitment shall automatically and immediately terminate upon the earliest to occur of (1) the consummation of the Merger Closing, but only if the Investors shall have funded the Closing Commitment in accordance with Section 1 of this letter agreement, (2) valid termination of the Merger Agreement in accordance with its terms (other than a termination of the Merger Agreement for which the Reverse Termination Fee, Special Termination Fee or any Reimbursement Amount is, in accordance with Section 8.3 of the Merger Agreement, due and owing by Parent or Acquisition Sub or, in the case of the Reimbursement Amounts, may become due and owing (any such termination for which the Reverse Termination Fee, Special Termination Fee or any Reimbursement Amount is so due and owing (or, in the case of any Reimbursement Amounts, may become due and owing, a “Qualifying Termination”))) and (3) the 150th day after a Qualifying Termination unless prior to the 150th day after such Qualifying Termination, (x) the Company shall have commenced a suit, action or other proceedings against Parent or (y) any event has occurred, that prevents, pursuant to applicable Law or any Insolvency Proceeding (as such term is defined below), the Company from commencing a suit, action or other proceedings against Parent, in each case, alleging the Termination Fee or any Reimbursement Amount (as applicable) is due and owing (or, in the case of any Reimbursement Amount, may become due and owing) (a “Qualifying Claim”); provided, that if (1) a Qualifying Termination has occurred and a Qualifying Claim is filed prior to the 150th day after a Qualifying Termination, or (2) clause (y) above is applicable, no Investor shall have any further liability or obligation under this letter agreement from and after the earliest of (i) the consummation of the Merger Closing, but only if the Investors shall have funded the Closing Commitment in accordance with Section 1 of this letter agreement, (ii) a final, non-appealable resolution of such Qualifying Claim determining that Parent does not owe any Reverse Termination Fee, Special Termination Fee or any Reimbursement Amounts that have not been fully satisfied and paid, (iii) a written agreement among the Investors, the Company and Parent terminating the obligations and liabilities of the Investors pursuant to Section 2(a) of this letter agreement and (iv) payment of the Reverse Termination Fee or Special Termination Fee, as applicable, and all Reimbursement Amounts (if any) unless any portion is legally compelled by judicial order or

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otherwise to be returned by the Company to Parent, Acquisition Sub or the Investors. In the event that the Company or any of its Affiliates, members, securityholders or representatives institutes any suit, action or other proceeding (A) asserting that any provisions of this Section 2 of this letter agreement are illegal, invalid or unenforceable in whole or in part or that the Investors are liable in excess of or to a greater extent than the aggregate Termination Commitment (other than in accordance with Section 1 of this letter agreement), (B) arising under, or in connection with, this letter agreement, the Merger Agreement, the Debt Commitment Letter or the transactions contemplated hereby or thereby, other than a Retained Claim or (C) in respect of a Retained Claim in any court or other tribunal other than a Chosen Court (as such term is defined below), except as provided for in the penultimate sentence of Section 11 of this letter agreement, then (x) the obligations of the Investors under this letter agreement shall terminate ab initio and be null and void, (y) if any Investor has previously made any payments under this letter agreement to Parent or Acquisition Sub, such Investor shall be entitled to recover such payments and (z) none of the Investors, Parent, Acquisition Sub nor any Investor Affiliate shall have any liability to the Company or any of its Affiliates under this letter agreement or with respect to the Merger Agreement, the Debt Commitment Letter or the transactions contemplated hereby or thereby.

(c) The obligations of the Investors under this letter agreement to fund, or to cause the funding of, the Termination Commitment in accordance with this Section 2 shall, to the fullest extent permitted by applicable Law, be absolute and unconditional and shall not be released or discharged in whole or in part, or otherwise affected, irrespective of: (i) any change in the corporate existence, structure or ownership of Parent or Acquisition Sub or Activant Acquisition Sub or any other Person interested in the transactions contemplated by the Merger Agreement or the Activant Merger Agreement, or any insolvency, bankruptcy, winding up, receivership, dissolution, assignment, reorganization or other similar proceeding (each, an “Insolvency Proceeding”) affecting Parent, Acquisition Sub or Activant Acquisition Sub or any other Person interested in the transactions contemplated by the Merger Agreement or the Activant Merger Agreement or any of their respective assets, (ii) any rescission, waiver, compromise or other amendment or modification of the Merger Agreement, Activant Merger Agreement or any other agreement evidencing, securing, or otherwise executed in connection with, any of the Termination Commitments, or change in the manner, place or terms of payment or performance, or any change or extension of the time, place or manner of payment or performance of, or renewal of, any Termination Commitment, any escrow arrangement or other security therefor, or any amendment or waiver of or any consent to any departure from the terms of the Merger Agreement or the Activant Merger Agreement or the documents entered into in connection therewith, (iii) the addition, substitution or release of any other Person interested in the transactions contemplated by the Merger Agreement or the Activant Merger Agreement, (iv) any lack of validity or enforceability of the Merger Agreement or the Activant Merger Agreement, any other agreement or instrument relating thereto, other than by reason of fraud or intentional misrepresentation by the Company, (v) the existence of any claim, set-off or other right that the Investors may have at any time against Parent, Acquisition Sub or the Company, whether in connection with any Termination Commitment, the Merger Agreement, the Activant Merger Agreement or otherwise, (vi) the failure of the Company to assert any claim or demand or to enforce any right or remedy against Parent, Acquisition Sub or any other Person interested in the transactions contemplated by the Merger Agreement or (vii) the adequacy of any other means the Company or Activant may have of obtaining payment of any Termination Commitment.

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(a) it has the power and authority required to enter into the obligations set out in this letter agreement and to perform fully such obligations as contemplated by this letter agreement in accordance with its terms;

(b) there is not in existence any document, agreement, arrangement or understanding in relation to any aspect of the Equity Financing or this letter agreement to which any Investor, Parent, Acquisition Sub or any Investor Affiliate is a party which would prejudice the Parent’s or Acquisition Sub’s ability to pay or procure payment of the amounts payable to the Company pursuant to the Merger Agreement or such Investor’s ability to fund the Closing Commitment and Termination Commitment pursuant to this letter agreement;

(c) all consents, approvals, authorizations, permits of, filings with and notifications to, any Governmental Body necessary for the due execution, delivery of and performance of this letter agreement by such Investor have been obtained or made and all conditions therefor have been duly complied with, and no other action by, and, no notice to or filing with, any Governmental Body is required in connection with the execution, delivery of and performance of this letter agreement;

(d) the entering into of this letter agreement and/or committing the Closing Commitment and the Termination Commitment to Parent and Acquisition Sub will not result in such Investor being in breach of any investment restriction or other obligation contained in its limited partnership agreements, any side letters related thereto, similar organizational documents or any Law, regulation, rule, order judgment or contractual restriction binding on the Investor or its assets;

(e)(i) such Investor and its Affiliates and Representatives will not cause Parent or Acquisition Sub to file for any voluntary Insolvency Proceeding, (ii) such Investor will take necessary actions so that Parent and Acquisition Sub do not file for any voluntary Insolvency Proceeding, and (iii) such Investor will use reasonable efforts to oppose any involuntary Insolvency Proceeding, in each case with respect to Parent or Acquisition Sub (for the avoidance of doubt, in no event shall such efforts include the obligation to provide or expend funds that are not otherwise required to be provided or expended pursuant to this letter agreement);

(f) such Investor has all requisite power and authority to execute and deliver this letter agreement; all action on the part of such Investor necessary for the authorization, execution,

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delivery and performance of this letter agreement has been taken; and this letter agreement, when executed and delivered by such Investor, constitutes a valid and legally binding obligation of such Investor; and

(g) such Investor has the financial capacity to pay and perform its obligations under this letter agreement, and all funds necessary for such Investor to fulfill its obligations under this letter agreement shall be available to such Investor for so long as this letter agreement shall remain in effect in accordance with Section 2(c) of this letter agreement.

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If this letter agreement is agreeable to you, please so indicate by signing in the space indicated below.

Very truly yours,

Signature Page to Equity Commitment Letter

Accepted and agreed as of April 4, 2011

Signature Page to Equity Commitment Letter

Accepted and agreed as of April 4, 2011

Signature Page to Equity Commitment Letter