Exhibit 10.5

AMENDMENT NO. 3

TO

LOAN AND SECURITY AGREEMENT

THIS AMENDMENT NO. 3 TO LOAN AND SECURITY AGREEMENT (this “Amendment”) is entered into as of this 14th day of April, 2010, by and between OPENWAVE SYSTEMS INC., a Delaware corporation (“Borrower”), and SILICON VALLEY BANK (“Bank”). Capitalized terms used herein without definition shall have the same meanings given them in the Loan Agreement (defined below).

RECITALS

A. Borrower and Bank have entered into that certain Loan and Security Agreement dated as of January 23, 2009 (as amended to date and as may be further amended, restated, supplement or otherwise modified from time to time, the “Loan Agreement”), pursuant to which the Bank has agreed to extend and make available to Borrower certain advances of money.

B. Borrower desires that Bank amend the Loan Agreement upon the terms and conditions more fully set forth herein.

C. Subject to the representations and warranties of Borrower, and upon the terms and conditions set forth in this Amendment, Bank is willing to amend the Loan Agreement.

AGREEMENT

NOW, THEREFORE, in consideration of the foregoing Recitals and intending to be legally bound, the parties hereto agree as follows:

1. Amendments to Loan Agreement.

1.1 Section 2.5(a) (Fees). Section 2.5(a) of the Loan Agreement is hereby amended and restated in its entirety as follows:

“(a) Commitment Fee. A fully earned, non-refundable commitment fee of $125,000 on the second anniversary of the Effective Date.”

1.2 Sections 6.2(c) and (d) (Financial Statements, Reports, Certificates). Sections 6.2(c) and (d) of the Loan Agreement are hereby amended and restated in their entirety as follows:

“(c) Within thirty (30) days after the last day of each month, deliver to Bank a cash balance report, including account statements detailing cash management types of investments held and maturity dates, together with a duly completed Compliance Certificate signed by a Responsible Officer setting forth calculations showing compliance with the financial covenants set forth in this Agreement; provided, however, for reporting months 3, 6, 9 and 12 of each fiscal year, the foregoing Compliance Certificate shall be delivered within forty-five (45) days after the last day of such month.

(d) Allow Bank to audit Borrower’s Collateral at Borrower’s reasonable expense. Such audits shall be conducted once every twelve (12) months if the aggregate amount of outstanding Advances exceeds $30,000,000 for at least 30 consecutive days, or more frequently, at Bank’s discretion.”

1.3 Section 6.7(b) (Financial Covenants). Section 6.7(b) of the Loan Agreement is hereby amended and restated in its entirety as follows:

“(b) Minimum EBITDA. Maintain on a trailing four quarter basis, as measured as of the last day of each fiscal quarter set forth below, EBITDA equal to or greater than the amount set forth opposite thereto:

”

1.4 Section 13 (Definitions). The definitions of the following terms in Section 13 of the Loan Agreement are hereby amended and restated in their entirety as follows:

““Borrowing Base” is $30,000,000 plus 75% of Eligible Accounts, as determined by Bank from Borrower’s most recent Borrowing Base Certificate; provided, however, Bank may decrease the foregoing percentage in its good faith business judgment based on events, conditions, contingencies, or risks which, as determined by Bank, may adversely affect Collateral.”

““Revolving Line Maturity Date” is January 23, 2012.”

Subsection (a) of the definition of “Permitted Distributions” in Section 13 of the Loan Agreement is hereby amended and restated in its entirety as follows:

“(a) purchases of capital stock and/or options from former or existing employees, consultants and directors pursuant to repurchase agreements or other similar agreements not to exceed $5,000,000 in the aggregate, provided that at the time of such purchase no Default or Event of Default has occurred and is continuing;”

Subsection (m) of the definition of “Permitted Investments” in Section 13 of the Loan Agreement is hereby amended and restated in its entirety as follows:

“(m) other Investments, if, on the date of incurring any Investments pursuant to this clause (m), the outstanding aggregate amount of all Investments incurred pursuant to this clause (m) does not exceed $1,000,000.”

1.5 Exhibit C (Compliance Certificate). The form of Compliance Certificate (Exhibit C to the Loan Agreement) is amended and restated in its entirety and attached hereto as Exhibit C.

2. BORROWER’S REPRESENTATIONS AND WARRANTIES. Borrower represents and warrants that:

(a) immediately upon giving effect to this Amendment (i) the representations and warranties contained in the Loan Documents are true, accurate and complete in all material respects as of the date hereof (except to the extent such representations and warranties relate to an earlier date, in which case they are true and correct as of such date), and (ii) no Event of Default has occurred and is continuing;

(b) Borrower has the corporate power and authority to execute and deliver this Amendment and to perform its obligations under the Loan Agreement, as amended by this Amendment;

(c) the certificate of incorporation and by-laws of Borrower (collectively, “Organizational Documents”) delivered to Bank on or prior to the date hereof are true, accurate and complete and have not been amended, supplemented or restated and are and continue to be in full force and effect as of the date hereof, and Borrower shall promptly deliver to Bank any amendments, supplements, restatements or other modifications to such Organizational Documents;

(d) the execution and delivery by Borrower of this Amendment and the performance by Borrower of its obligations under the Loan Agreement, as amended by this Amendment, have been duly authorized by all necessary corporate action on the part of Borrower;

(e) this Amendment has been duly executed and delivered by the Borrower and is the binding obligation of Borrower, enforceable against it in accordance with its terms, except as such enforceability may be limited by bankruptcy, insolvency, reorganization, liquidation, moratorium or other similar laws of general application and equitable principles relating to or affecting creditors’ rights; and

(f) as of the date hereof, Borrower has no defenses against the obligations to pay any amounts under the Obligations. Borrower acknowledges that Bank has acted in good faith and has conducted in a commercially reasonable manner its relationships with Borrower in connection with this Amendment and in connection with the Loan Documents.

Borrower understands and acknowledges that Bank is entering into this Amendment in reliance upon, and in partial consideration for, the above representations and warranties, and agrees that such reliance is reasonable and appropriate.

3. LIMITATION. The amendments set forth in this Amendment shall be limited precisely as written and shall not be deemed (a) to be a waiver, consent, amendment or other modification of any other term or condition of the Loan Agreement or of any other instrument or agreement referred to therein or to prejudice any right or remedy which Bank may now have or may have in the future under or in connection with the Loan Agreement or any instrument or agreement referred to therein; or (b) to be a consent to any future amendment or modification or waiver to any instrument or agreement the execution and delivery of which is consented to hereby, or to any waiver of any of the provisions thereof. Except as expressly amended hereby, the Loan Agreement shall continue in full force and effect.

4. EFFECTIVENESS. This Amendment shall be deemed effective March 31, 2010 upon the satisfaction of all the following conditions precedent:

4.1 Amendment. Borrower and Bank shall have duly executed and delivered this Amendment to Bank.

4.2 Payment of Bank Expenses. Borrower shall have paid all Bank Expenses (including all reasonable attorneys’ fees and reasonable expenses) incurred through the date of this Amendment.

5. COUNTERPARTS. This Amendment may be signed in any number of counterparts, and by different parties hereto in separate counterparts, with the same effect as if the signatures to each such counterpart were upon a single instrument. All counterparts shall be deemed an original of this Amendment.

6. INTEGRATION. This Amendment and any documents executed in connection herewith or pursuant hereto contain the entire agreement between the parties with respect to the subject matter hereof and supersede all prior agreements, understandings, offers and negotiations, oral or written, with respect thereto and no extrinsic evidence whatsoever may be introduced in any judicial or arbitration proceeding, if any, involving this Amendment; except that any financing statements or other agreements or instruments filed by Bank with respect to Borrower shall remain in full force and effect.

7. GOVERNING LAW; VENUE. THIS AMENDMENT SHALL BE GOVERNED BY AND SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF CALIFORNIA. Borrower and Bank each submit to the exclusive jurisdiction of the State and Federal courts in Santa Clara County, California.

[Signature page follows]

IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be executed as of the date first written above.

EXHIBIT C - COMPLIANCE CERTIFICATE

The undersigned authorized officer of Openwave Systems Inc. (“Borrower”) certifies that under the terms and conditions of the Loan and Security Agreement between Borrower and Bank (the “Agreement”), (1) Borrower is in complete compliance for the period ending                      with all required covenants except as noted below, (2) there are no Events of Default, (3) all representations and warranties in the Agreement are true and correct in all material respects on this date except as noted below; provided, however, that such materiality qualifier shall not be applicable to any representations and warranties that already are qualified or modified by materiality in the text thereof; and provided, further that those representations and warranties expressly referring to a specific date shall be true, accurate and complete in all material respects as of such date, (4) Borrower, and each of its Subsidiaries, has timely filed all required tax returns and reports, and Borrower has timely paid all foreign, federal, state and local taxes, assessments, deposits and contributions owed by Borrower except as otherwise permitted pursuant to the terms of Section 5.9 of the Agreement, and (5) no Liens have been levied or claims made against Borrower or any of its Subsidiaries relating to unpaid employee payroll or benefits of which Borrower has not previously provided written notification to Bank. Attached are the required documents supporting the certification. The undersigned certifies that these are prepared in accordance with GAAP consistently applied from one period to the next except as explained in an accompanying letter or footnotes. The undersigned acknowledges that no borrowings may be requested at any time or date of determination that Borrower is not in compliance with any of the terms of the Agreement, and that compliance is determined not just at the date this certificate is delivered. Capitalized terms used but not otherwise defined herein shall have the meanings given them in the Agreement.

Please indicate compliance status by circling Yes/No under “Complies” column.

Schedule 1

to Compliance Certificate

Dated:                             

Financial Covenants of Borrower

In the event of a conflict between this Schedule and the Agreement, the terms of the Agreement shall govern.

I. Liquidity Coverage Ratio (Section 6.7 (a))

Actual:

Is line C equal to or greater than 2.00:1.00?

II. Minimum EBITDA (Section 6.7(b))

Actual:

Is line E equal to or greater than the amount set forth opposite such time period above?