Document:

Amendment to Rights Agreement dated as of July 7, 2009

 Exhibit 4.1 
 AMENDMENT TO 
 RIGHTS AGREEMENT 
 This Amendment, dated as of July 7, 2009 (the “Amendment”), to the Rights Agreement, dated as of October 10, 2008 (the
“Rights Agreement”), between MSC.Software Corporation, a Delaware corporation (the “Company”), and Mellon Investor Services LLC, a New Jersey limited liability company, as Rights Agent (the “Rights
Agent”). Capitalized terms used herein and not defined shall have the meanings specified in the Rights Agreement. 
 RECITALS

 WHEREAS, the Company and the Rights Agent are parties to the Rights Agreement; 
 WHEREAS, the Company is entering into an Agreement and Plan of Merger (as may be amended from time to time, the “Merger Agreement”),
dated as of July 7, 2009, among the Company, Maximus Holdings Inc., a Delaware corporation (“Parent”), and Maximus Inc., a Delaware corporation and a wholly-owned subsidiary of Parent (the “Merger Subsidiary”)
pursuant to which Merger Subsidiary will merge with and into the Company (the “Merger”) upon the terms and subject to the conditions set forth in the Merger Agreement; 
 WHEREAS, the Board of Directors of the Company has determined that the Merger Agreement and the terms and conditions set forth therein and the
transactions contemplated thereby, including, without limitation, the Merger, are in the best interests of the Company and its stockholders; 
 WHEREAS, the Board of Directors of the Company has determined, in connection with its contemplation of the Merger Agreement, that an amendment to the Rights Agreement as set forth herein is necessary and desirable to exempt the Merger
Agreement, the Voting Agreement (as defined in the Merger Agreement) and the transactions contemplated thereby, including, without limitation, the Merger, from the application of the Rights Agreement as set forth in this Amendment; 
 WHEREAS, pursuant to Section 24 of the Rights Agreement, the Company may, and the Rights Agent shall, if the Company so directs, supplement or amend
any provisions of the Rights Agreement, subject to the limitations set forth in such Section 24; and 
 WHEREAS, pursuant to
Section 24 of the Rights Agreement, the Company hereby directs that the Rights Agreement should be amended as set forth herein. 

 AGREEMENT 
 Accordingly, in consideration of the premises and the mutual agreements herein set forth, the parties hereto hereby agree as follows: 
 A. Amendment of Certain Definitions. 
 Section 1(a) of the Rights Agreement is supplemented to
add the following definitions in the appropriate alphabetical locations: 
 “Buyer” means Maximus Holdings
Inc., a Delaware corporation. 
 “Effective Time” means the “Effective Time” as such term is
defined in the Merger Agreement. 
 “Merger” means the “Merger” as such term is defined in the
Merger Agreement. 
 “Merger Agreement” means the Agreement and Plan of Merger (as may be amended from time
to time), dated as of July 7, 2009, among the Company, Buyer and a wholly-owned subsidiary of Buyer. 
 “Voting
Agreements” means the “Voting Agreements” as such term is defined in the Merger Agreement. 
 The definition of
“Acquiring Person” in Section 1(a) of the Rights Agreement is hereby amended by adding the following sentence at the end thereof as paragraph (iv): 
 “(iv) Buyer, or any of its Affiliates, Associates or Subsidiaries, as a result of the approval, execution, delivery, announcement or
performance of the Merger Agreement, the Voting Agreements or the consummation of the Merger or any other transaction contemplated by the Merger Agreement.” 
 The definition of “Expiration Date” in Section 1(a) of the Rights Agreement is hereby deleted in its entirety and the following is substituted in lieu thereof: 
 “Expiration Date” means the earlier of (i) the Final Expiration Date, (ii) the time at which all Rights are
redeemed as provided in Section 20 or exchanged as provided in Section 21 or (iii) immediately prior to the Effective Time. 
 The definition of “Stock Acquisition Date” in Section 1(a) of the Rights Agreement is hereby amended by adding the following sentence at the end thereof: 
 “Notwithstanding anything in this Agreement to the contrary, a Stock Acquisition Date shall not be deemed to have occurred as the result of the
approval, execution, delivery, announcement or performance of the Merger Agreement, the Voting Agreements or the consummation of the Merger or any other transaction contemplated by the Merger Agreement.” 
  

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 B. Amendment of Section 3. Section 3 of the Rights Agreement is hereby amended and
supplemented by adding the following sentence at the end thereof as a new Section 3(e): 
 “(e) Nothing in this
Agreement shall be construed to give any holder of Rights or any other Person any legal or equitable rights, remedies or claims under this Agreement by virtue of the approval, execution, delivery, announcement or performance of the Merger Agreement,
the Voting Agreements or the consummation of the Merger or any other transaction contemplated by the Merger Agreement.” 
 C. Addition
of Section 31. A new Section 31 shall be added to the Rights Agreement and shall read as follows: 
 “Section 31.
Termination. Immediately prior to the Effective Time, this Agreement shall be terminated and all outstanding Rights shall expire. The Company shall promptly notify the Rights Agent in writing upon the occurrence of the Effective Time and, if
such notification is given orally, the Company shall confirm same in writing on or prior to the Business Day next following. Until such notice is received by the Rights Agent, the Rights Agent may presume conclusively for all purposes that the
Distribution Date has not occurred.” 
 D. Effect of Amendment. Except as expressly set forth herein, the Rights Agreement shall
not by implication or otherwise be supplemented or amended by virtue of this Amendment, but shall remain in full force and effect, as amended hereby. This Amendment shall be construed in accordance with and as a part of the Rights Agreement, and all
terms, conditions, representations, warranties, covenants and agreements set forth in the Rights Agreement and each other instrument or agreement referred to therein, except as herein amended, are hereby ratified and confirmed. In the event that the
Merger Agreement is terminated by either the Company or the Parent, in accordance with Section 10.01 thereof, this Amendment shall be deemed to be no longer in effect. 
 E. Severability. If any term, provision or restriction of this Amendment is held by a court of competent jurisdiction or other authority to be
invalid, void or unenforceable, the remainder of the terms, provisions or restriction of this Amendment shall remain in full force and effect and shall in no way be affected, impaired or invalidated. 
 F. Governing Law. This Amendment shall be deemed to be a contract made under the laws of the State of Delaware and for all purposes shall be
governed by and construed in accordance with the laws of such state applicable to contracts to be made and performed entirely within such state, provided, however, that all provisions regarding 

  

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the rights, duties and obligations of the Rights Agent shall be governed by and construed in accordance with the laws of the State of New York
applicable to contracts made and to be performed entirely within such state, without regard to the principles or rules concerning conflicts of laws which might otherwise require application of the substantive laws of another jurisdiction.

 G. Counterparts. This Amendment may be executed in any number of counterparts and each of such counterparts shall for all purposes
be deemed to be an original, and all such counterparts shall together constitute but one and the same instrument. This Amendment shall become effective when each party hereto shall have received a counterpart hereof signed by all of the other
parties hereto. Until and unless each party has received a counterpart hereof signed by the other party hereto, this Amendment shall have no effect and no party shall have any right or obligation hereunder (whether by virtue of any other oral or
written agreement or other communication). 
 H. Effective Date of Amendment. This Amendment shall be deemed effective as of the date
first written above, as if executed on such date, when each party hereto shall have received a counterpart hereof signed by the other party hereto. 
 I. Descriptive Headings. Descriptive headings appear herein for convenience only and shall not control or affect the meaning or construction of any of the provisions hereof. 
  

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 IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed, all as of the day
and year first above written. 
  

			
	Company:
	
	MSC.SOFTWARE CORPORATION
		
	By:	 	 /s/    John A. Mongelluzzo

	Name:	 	John A. Mongelluzzo
	Title:	 	Executive Vice President, Business Administration, Legal Affairs and Secretary
	
	Rights Agent:
	
	 MELLON INVESTOR SERVICES LLC,
 as Rights
Agent

		
	By:	 	 /s/    Mark Cano

	Name:	 	Mark Cano
	Title:	 	Relationship Manager

 [Signature Page to Rights Amendment]Limited Guarantee dated as of July 7, 2009

 Exhibit 10.1 
 LIMITED GUARANTEE 
 Limited Guarantee, dated as of July 7, 2009 (this “Limited
Guarantee”), by each of STG III, L.P., a Delaware limited partnership (“STG III”), and STG III-A, L.P., a Delaware limited partnership (“STG III-A” and, together with STG III, the
“Guarantors”), in favor of MSC.Software Corporation (the “Guaranteed Party”). 
 1. Limited
Guarantee. To induce the Guaranteed Party to enter into an Agreement and Plan of Merger, dated as of July 7, 2009 (as it may be amended from time to time, the “Merger Agreement”; capitalized terms used but not defined
herein shall have the meanings given to such terms in the Merger Agreement), by and among Maximus Holdings Inc., a Delaware corporation (“Parent”), Maximus Inc., a Delaware corporation and wholly-owned subsidiary of Parent
(“Merger Sub”), and the Guaranteed Party, pursuant to which Merger Sub, or a permitted assignee, will merge with and into the Guaranteed Party, each of the Guarantors, severally and not jointly (based on their respective Pro Rata
Portions (as defined below)), hereby absolutely, unconditionally and irrevocably guarantees to the Guaranteed Party the due and punctual performance and discharge of the payment obligations of Parent under Sections 11.04(c) and 11.04(d) of the
Merger Agreement (the “Obligations”). The “Pro Rata Portion” for STG III shall be 88.29%, and the “Pro Rata Portion” for STG III-A shall be 11.71%. The obligations of each Guarantor hereunder are those of primary
obligor, and not merely as surety, and are independent of the Obligations and the obligations of any other guarantor, and a separate action may be brought against the Guarantor to enforce this Limited Guaranty whether or not the Guaranteed Party or
any other person or entity is joined as a party. 
 2. Nature of Guarantee. The Guaranteed Party shall not be obligated to file any
claim relating to the Obligations in the event that Parent or Merger Sub becomes subject to a bankruptcy, reorganization or similar proceeding, and the failure of the Guaranteed Party to so file shall not affect the Guarantors’ obligations
hereunder. In the event that any payment to the Guaranteed Party in respect of the Obligations is rescinded or must otherwise be returned for any reason whatsoever, the Guarantors shall remain liable hereunder with respect to the Obligations as if
such payment had not been made. This is an unconditional guarantee of payment and not merely of collectibility. 
 3. Changes in
Obligations; Certain Waivers. Each of the Guarantors agrees that the Guaranteed Party may at any time and from time to time, without notice to or further consent of such Guarantor, extend the time of payment of any of the Obligations, and may
also make any agreement with Parent, Merger Sub or any assignee of Parent or Merger Sub pursuant to Section 11.06(b) of the Merger Agreement (“Assignee”), for the extension, renewal, payment, compromise, discharge or release
thereof, in whole or in part, or for any modification of the terms thereof or of any other agreement between the Guaranteed Party and Parent, Merger Sub or any Assignee without in any way impairing or affecting such Guarantor’s obligations
under this Limited Guarantee, but in any case subject to the last sentence of Section 4(a) and to Section 7(a). Each Guarantor agrees that, except as set forth in Section 7(a), the obligations of such Guarantor hereunder shall not be
released or discharged, in whole or in part, or otherwise affected by (a) the failure of the Guaranteed Party to assert any claim or demand or to enforce any right or remedy 

 
against Parent, Merger Sub or any Assignee; (b) any change in the time, place or manner of payment of any of the Obligations or any rescission, waiver,
compromise, consolidation or other amendment or modification of any of the terms or provisions of the Merger Agreement or any other agreement evidencing, securing or otherwise executed in connection with any of the Obligations; (c) any change
in the corporate existence, structure or ownership of Parent, Merger Sub or any Assignee; (d) any insolvency, bankruptcy, reorganization or other similar proceeding affecting Parent, Merger Sub or any Assignee; (e) the existence of any
claim, set-off or other right which such Guarantor may have at any time against Parent, Merger Sub, any Assignee or the Guaranteed Party, whether in connection with the Obligations or otherwise; or (f) the adequacy of any other means the
Guaranteed Party may have of obtaining repayment of any of the Obligations. To the fullest extent permitted by law, each Guarantor hereby expressly waives any and all rights or defenses arising by reason of any law which would otherwise require any
election of remedies by the Guaranteed Party. Each Guarantor waives promptness, diligence, notice of the acceptance of this Limited Guarantee and of the Obligations, presentment, demand for payment, notice of non-performance, default, dishonor and
protest, notice of any Obligations incurred and all other notices of any kind (except for notices to be provided to Parent, Merger Sub and Shearman & Sterling LLP in accordance with Section 11.01 of the Merger Agreement), all defenses
which may be available by virtue of any valuation, stay, moratorium law or other similar law now or hereafter in effect, any right to require the marshalling of assets of Parent, Merger Sub or any Assignee, and all suretyship defenses generally
(other than fraud or willful misconduct by the Guaranteed Party or any of its Subsidiaries, defenses to the payment of the Obligations that are available to Parent or Merger Sub under the Merger Agreement or breach by the Guaranteed Party of this
Limited Guarantee). Each Guarantor acknowledges that it will receive substantial direct and indirect benefits from the transactions contemplated by the Merger Agreement and that the waivers set forth in this Limited Guarantee are knowingly made in
contemplation of such benefits. 
 4. Additional Agreements. 
 a) The Guaranteed Party hereby covenants and agrees that it shall not institute, and shall cause its Affiliates not to institute, any proceeding or bring
any other claim arising under, or in connection with, the Merger Agreement or the transactions contemplated thereby or otherwise relating thereto against the Guarantors (except for claims against the Guarantors under this Limited Guarantee, subject
to the limitations described herein), Parent or Merger Sub or against (a) any of the Guarantors’ respective former, current or future directors, officers, agents, Affiliates (other than Parent or Merger Sub) or employees, (b) any of
the respective former, current or future general or limited partners, members, managers or stockholders of the Guarantors or any Affiliate thereof (other than Parent or Merger Sub), or (c) any former, current or future directors, officers,
agents, Affiliates, general or limited partners, members, managers or stockholders of any of the foregoing (other than Parent or Merger Sub) ((a) through (c) collectively, the “Guarantor Affiliates”). Notwithstanding the
foregoing, in connection with the pursuit by the Guaranteed Party of a claim under this Limited Guarantee, the Guaranteed Party may pursue a declaratory judgment claim against Parent to demonstrate that Parent has failed to perform its obligations
under Sections 11.04(c) and 11.04(d) of the Merger Agreement; provided that such claim does not seek any other remedy (including damages) against Parent or Merger Sub. Notwithstanding anything to the contrary contained in this Limited
Guarantee, the Guaranteed Party hereby agrees that to the extent Parent is relieved of its obligations under Sections 11.04(c) and 11.04(d) of the Merger Agreement, each of the Guarantors shall be similarly relieved of its obligations under
this Limited Guarantee. 

 b) Each of the Guarantors hereby covenants and agrees that it shall not institute, and shall cause its
Affiliates not to institute, any proceedings asserting that this Limited Guarantee is illegal, invalid or unenforceable in accordance with its terms, subject to the effects of bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium
or other similar laws affecting creditors’ rights generally, and general equitable principles (whether considered in a proceeding in equity or at law). Each of the Guarantors hereby unconditionally and irrevocably agrees not to exercise any
rights that it may now have or hereafter acquire against Parent, Merger Sub or any Assignee that arise from the existence, payment, performance, or enforcement of such Guarantor’s obligations under or in respect of this Limited Guarantee or any
other agreement in connection therewith, including, without limitation, any right of subrogation, reimbursement, exoneration, contribution or indemnification and any right to participate in any claim or remedy of the Guaranteed Party against Parent,
Merger Sub or any Assignee, whether or not such claim, remedy or right arises in equity or under contract, statute or common law, including, without limitation, the right to take or receive from Parent, Merger Sub or any Assignee, directly or
indirectly, in cash or other property or by set-off or in any other manner, payment or security on account of such claim, remedy or right, unless and until all of such Guarantor’s Obligations shall have been paid in full in cash. If any amount
shall be paid to a Guarantor in violation of the immediately preceding sentence at any time prior to the payment in full in cash of such Guarantor’s Obligations, such amount shall be received and held in trust for the benefit of the Guaranteed
Party and shall forthwith be paid or delivered to the Guaranteed Party in the same form as so received (with any necessary endorsement or assignment) to be credited and applied to such Obligations, in accordance with the terms of the Merger
Agreement, whether matured or unmatured, or to be held as collateral for any such Obligations. 
 5. No Waiver; Cumulative Rights. No
failure on the part of the Guaranteed Party to exercise, and no delay in exercising, any right, remedy or power hereunder shall operate as a waiver thereof, nor shall any single or partial exercise by the Guaranteed Party of any right, remedy or
power hereunder preclude any other or future exercise of any right, remedy or power hereunder. Each and every right, remedy and power hereby granted to the Guaranteed Party or allowed it by law or other agreement shall be cumulative and not
exclusive of any other, and may be exercised by the Guaranteed Party at any time or from time to time. 
 6. Representations and
Warranties. Each of the Guarantors, severally and not jointly, hereby represents and warrants that: 
 a) the execution, delivery and
performance of this Limited Guarantee have been duly authorized by all necessary action and do not contravene any provision of such Guarantor’s partnership agreement or other organizational documents or any law, regulation, rule, decree, order,
judgment or contractual restriction binding on such Guarantor or its assets; 
 b) all consents, approvals, authorizations, permits of,
filings with and notifications to, any governmental authority necessary for the due execution, delivery and performance of this Limited Guarantee by such Guarantor have been obtained or made and all conditions thereof have been duly complied with,
and no other action by, and no notice to or filing with, any governmental authority or regulatory body is required in connection with the execution, delivery or performance of this Limited Guarantee; 

 c) this Limited Guarantee constitutes a legal, valid and binding obligation of such Guarantor enforceable
against such Guarantor in accordance with its terms, subject to (i) the effects of bankruptcy, insolvency, fraudulent conveyance, reorganization, moratorium or other similar laws affecting creditors’ rights generally, and (ii) general
equitable principles (whether considered in a proceeding in equity or at law); and 
 d) such Guarantor has available sufficient capital
commitments from its limited partners to pay and perform its Obligations under this Limited Guarantee, and will have available sufficient capital commitments from its limited partners to pay and perform such Obligations for so long as this Limited
Guarantee shall remain in effect in accordance with Section 7 hereof. 
 7. Continuing Guarantee; Enforcement. This Limited
Guarantee shall remain in full force and effect and shall be binding on each of the Guarantors and its respective successors and assigns until the Obligations are satisfied in full. Notwithstanding the foregoing, this Limited Guarantee shall
terminate and the Guarantors shall have no further obligations under this Limited Guarantee as of the earliest of (i) the Effective Time, (ii) the termination of the Merger Agreement in accordance with its terms (except a termination
pursuant to which Parent is obligated to make a payment pursuant to Section 11.04(c) thereof) and (iii) 180 days after any termination of the Merger Agreement in accordance with its terms under circumstances in which Parent would be
obligated to make any payment under Section 11.04(c) if the Guaranteed Party has not presented a claim for payment of any Obligation to Parent and Merger Sub or the Guarantor by the end of such 180 day period. Notwithstanding the foregoing, in
the event that the Guaranteed Party or any of its Affiliates asserts in any litigation or other proceeding that (A) the provisions of Section 1 hereof limiting the Guarantors’ liability, the provisions of this Section 7, the
provisions of Section 8 or Section 9 hereof or (B) the provisions of Section 11.04(e), 11.04(f) or 11.04(g) of the Merger Agreement limiting the liability of the Parent Related Parties are illegal, invalid or unenforceable in
whole or in part, or asserting any theory of liability against the Guarantors, Parent, Merger Sub or any other Guarantor Affiliate with respect to the transactions contemplated by the Merger Agreement other than liability of the Guarantors under
this Limited Guarantee (as limited by the provisions of Section 1), then (i) the obligations of the Guarantors under this Limited Guarantee shall terminate ab initio and be null and void, (ii) if the Guarantors have previously
made any payments under this Limited Guarantee, they shall be entitled to recover such payments, and (iii) neither the Guarantors, Parent, Merger Sub or any Guarantor Affiliate shall have any liability to the Guaranteed Party with respect to
the transactions contemplated by the Merger Agreement or under this Limited Guarantee; provided, however that if any Guarantor or any of its respective Affiliates shall institute any proceedings asserting that this Limited Guarantee is
illegal, invalid or unenforceable in accordance with its terms, then, to the extent the Guaranteed Party prevails in such litigation or proceeding, such Guarantor shall pay on demand all reasonable fees and out-of-pocket expenses of the Guaranteed
Party in connection with such litigation or proceeding. 
 8. No Recourse. The Guaranteed Party by its acceptance of the benefits
hereof, covenants, agrees and acknowledges that no Person other than the Guarantors shall have any obligation hereunder and that no recourse hereunder or under any documents or instruments 

 
delivered in connection herewith shall be had against Parent, Merger Sub or any Guarantor Affiliate, whether by the enforcement of any assessment or by any
legal or equitable proceeding, or by virtue of any statute, regulation or other applicable law. The Guaranteed Party acknowledges and agrees that Parent and Merger Sub have no assets and that no funds are expected to be contributed to Parent or
Merger Sub unless the Closing occurs. The Guaranteed Party further agrees that neither it nor any of its Affiliates have any right of recovery against the Guarantors, Parent, Merger Sub or any Guarantor Affiliate, through Parent or Merger Sub or
otherwise, whether by piercing of the corporate veil, by a claim on behalf of Parent or Merger Sub against the Guarantors or Parent’s stockholders or Affiliates, or otherwise, except for the rights under this Limited Guarantee. Recourse against
the Guarantors under this Limited Guarantee shall be the exclusive remedy of the Guaranteed Party and its Affiliates against the Guarantors, Parent, Merger Sub and any Guarantor Affiliate in respect of any liabilities or obligations arising under,
or in connection with, the Merger Agreement or the transactions contemplated thereby. The Guaranteed Party hereby covenants and agrees that it shall not institute, and it shall cause its Affiliates not to institute, any proceeding or bring any other
claim arising under, or in connection with, the Merger Agreement or the transactions contemplated thereby, against the Guarantors, Parent, Merger Sub or any Guarantor Affiliate (except for claims against the Guarantors under this Limited Guarantee,
subject to the limitations described herein). Except as contemplated under Section 10, nothing set forth in this Limited Guarantee shall affect or be construed to confer or give any Person other than the Guarantors and the Guaranteed Party
(including any Person acting in a representative capacity) any rights or remedies against any Person. 
 9. Release. By its acceptance
of this Limited Guarantee, the Guaranteed Party hereby covenants and agrees that (1) neither the Guaranteed Party nor any of its Subsidiaries or Affiliates, and the Guaranteed Party agrees to the maximum extent permitted by law, none of its
officers, directors, security holders or representatives, has or shall have any right of recovery under or in connection with the Merger Agreement, or the transactions contemplated thereby or otherwise relating thereto, and to the extent that it has
or obtains any such right it, to the maximum extent permitted by law, hereby waives (on its own behalf and on behalf of each of the aforementioned Persons) each and every such right against, and hereby releases, the Guarantors, Parent, Merger Sub
and each Guarantor Affiliate from and with respect to any claim, known or unknown, now existing or hereafter arising, in connection with any transaction contemplated by or otherwise relating to the Merger Agreement or the transactions contemplated
thereby, whether by or through attempted piercing of the corporate (or limited liability company) veil, by or through a claim by or on behalf of Parent or Merger Sub or any other Person against any Guarantors, or otherwise under any theory of law or
equity, other than claims against the Guarantors pursuant to this Limited Guarantee (subject to the limitations described herein); and (2) recourse against the Guarantors under this Limited Guarantee (and subject to the limitations described
herein) shall be the sole and exclusive remedy of the Guaranteed Party. The Guaranteed Party acknowledges the Guarantor is agreeing to enter into this Limited Guarantee in reliance on the provisions set forth in Section 4(a) and this
Section 9. This Section 9 shall survive termination of the Limited Guarantee. 
 10. No Assignment. Neither of the
Guarantors nor the Guaranteed Party may assign its rights, interests or obligations hereunder to any other Person (except by operation of law) without the prior written consent of the Guaranteed Party (in the case of an assignment by either 

 
Guarantor) or the Guarantors (in the case of an assignment by the Guaranteed Party); provided, however, the Guarantors may assign all or a portion of
its rights and obligations hereunder to an Affiliate capable of making the representation set forth in Section 6(d) above or to an entity managed or advised by an Affiliate of the Guarantors capable of making the representation set forth in
Section 6(d) above; provided further that no such assignment shall relieve the Guarantors of any liability or obligation hereunder, except to the extent actually performed or satisfied by the assignee. 
 11. Notices. All notices, requests and other communications to any party hereunder shall be in writing and shall be deemed given if delivered
personally, facsimiled (which is confirmed) or sent by overnight courier (providing proof of delivery) to the parties at the following addresses: 
 if to the Guaranteed Party, to it at: 
 MSC.Software Corporation 
 2 MacArthur Place 
 Santa Ana, CA 92707

 Attention: General Counsel 
 Facsimile: (714) 784-4231 
 with a copy (which shall not constitute notice) to: 
 Davis Polk & Wardwell LLP 
 1600 El Camino Real 
 Menlo Park, CA 94025 
 Attention: Alan F. Denenberg 
 Facsimile: (650) 750-2111 
 if to the Guarantors, to them at: 
 STG
III, L.P. and STG III-A, L.P. 
 c/o Symphony Technology Group 
 2475 Hanover Street 
 Palo Alto, CA 94304 
 Attention: Chief Financial Officer 
 Facsimile No.: (415) 358-8835 
 with a copy (which shall not constitute notice) to: 
 Shearman & Sterling LLP 
 525
Market Street 
 San Francisco, CA 94105 
 Attention: Steve L. Camahort 
 Facsimile No.: 415-616-1440 

 or such other address or facsimile number as such party may hereafter specify by like notice to the other parties hereto.
All such notices, requests and other communications shall be deemed received on the date of receipt by the recipient thereof if received prior to 5:00 P.M. in the place of receipt and such day is a business day in the place of receipt.
Otherwise, any such notice, request or communication shall be deemed not to have been received until the next succeeding business day in the place of receipt. 
 12. Governing Law. This Limited Guarantee shall be governed by, and construed in accordance with, the laws of the State of Delaware applicable to contracts executed in and to be performed entirely within that
State. 
 13. Consent to Jurisdiction. All actions and proceedings arising out of or relating to this Limited Guarantee or any of the
transactions contemplated hereby shall be heard and determined in the Delaware Court of Chancery or, if subject matter jurisdiction in the such court is not available, in the United States District Court for the District of Delaware, and the parties
hereto hereby irrevocably submit to the exclusive jurisdiction of such courts (and, in the case of appeals, appropriate appellate courts therefrom) in any such action or proceeding and irrevocably waive the defense of an inconvenient forum to the
maintenance of any such action or proceeding. The consent to jurisdiction set forth in this paragraph shall not constitute general consent to service of process in the State of Delaware and shall have no effect for any purpose except as provided in
this paragraph and shall not be deemed to confer rights on any Person other than the parties hereto. The parties hereto agree that a final judgment in any such action or proceeding shall be conclusive and may be enforced in other jurisdictions by
suit on the judgment or in any other manner provided by applicable law. 
 14. Waiver of Jury Trial. EACH PARTY ACKNOWLEDGES AND
AGREES THAT ANY CONTROVERSY WHICH MAY ARISE UNDER THIS LIMITED GUARANTEE IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT ISSUES AND, THEREFORE, EACH SUCH PARTY IRREVOCABLY AND UNCONDITIONALLY WAIVES ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY IN RESPECT
OF ANY LEGAL ACTION, SUIT OR PROCEEDING ARISING OUT OF OR RELATING TO THIS LIMITED GUARANTEE OR THE TRANSACTIONS CONTEMPLATED HEREBY (EACH, A “PROCEEDING”). Each party to this Limited Guarantee certifies and acknowledges that
(a) no Representative of any other party has represented, expressly or otherwise, that such other party would not seek to enforce the foregoing waiver in the event of a Proceeding, (b) such party has considered the implications of this
waiver, (c) such party makes this waiver voluntarily, and (d) such party has been induced to enter into this Limited Guarantee by, among other things, the mutual waivers and certifications in this Section 14. 
 15. Counterparts. This Limited Guarantee may be executed in counterparts (each of which shall be deemed to be an original but all of which taken
together shall constitute one and the same agreement) and shall become effective when one or more counterparts have been signed by each of the parties and delivered to the other parties. The exchange of copies of this Limited Guarantee and of
signature pages by facsimile or electronic transmission shall constitute effective execution and delivery of this Limited Guarantee as to the parties and may be used in lieu of the original Limited Guarantee for all purposes. Signatures of the
parties transmitted by facsimile or electronic transmission shall be deemed to be their original signatures for all purposes. 

 16. Amendments. This Limited Guarantee may not be modified, amended, altered or supplemented,
except upon the execution and delivery of a written agreement executed by each of the parties hereto. 
 17. Severability. If any term
or other provision of this Limited Guarantee is determined by a court of competent jurisdiction to be invalid, illegal or incapable of being enforced by any rule of law or public policy, all other terms, provisions and conditions of this Limited
Guarantee shall nevertheless remain in full force and effect. Upon such determination that any term or other provision is invalid, illegal or incapable of being enforced, the parties hereto shall negotiate in good faith to modify this Limited
Guarantee so as to effect the original intent of the parties as closely as possible to the fullest extent permitted by applicable law in an acceptable manner to the end that the transactions contemplated hereby are fulfilled to the extent possible.

 [Remainder of page intentionally left blank] 

 IN WITNESS WHEREOF, each of the undersigned has caused this Limited Guarantee to be executed and
delivered as of the date first written above by its officer thereunto duly authorized. 
  

			
	STG III, L.P. and STG III-A, L.P.
		
	Each By:	 	STG III GP, L.P., its General Partner
	By:	 	STG UGP, LLC, its General Partner
		
	By:	 	 /s/    William F. Chisholm

		 	Name: William F. Chisholm
		 	Title: Managing Director

 IN WITNESS WHEREOF, the Guaranteed Party has caused this Limited Guarantee to be executed
and delivered as of the date first written above by its officer thereunto duly authorized. 
  

			
	MSC.SOFTWARE CORPORATION
		
	By:	 	 /s/    Ashfaq A. Munshi

	Name:	 	Ashfaq A. Munshi
	Title:	 	Interim Chief Executive Officer and President

 [Signature Page to Limited Guarantee]

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