Document:

Prepared by MERRILL CORPORATION

QuickLinks
 -- Click here to rapidly navigate through this document

 
 

Exhibit 4.1    
  

 
 

LETTER AGREEMENT RE AES STOCK OPTIONS    
  

June 28,
2001 

Dear
                                      ("Optionee"):

As
you know, these are exciting times for AES—we have entered into a merger agreement with MSC Software Corporation ("MSC"). MSC is a public company with shares traded on the New York
Stock Exchange under the symbol "MNS." We anticipate that the MSC/AES merger ("Merger") will close by July 20, 2001, subject to possible unavoidable delays. 

MSC
has agreed to assume AES' employee stock options—that is to say, MSC has agreed to exchange your AES employee stock options with equivalent options to purchase MSC stock. As explained
below, to have MSC assume your options, you must sign and return this Letter Agreement Re AES Stock Options ("Agreement") to Shahdad Zand, 1809 E. Dyer Road, #313, Santa Ana, CA 92705, by no later
than the close of business on Tuesday, July 10, 2001. A copy of this Agreement is enclosed for your records. 

1. Purpose of Request  

Presently,
pursuant to one or more stock option agreements, you have options ("Tyra Options") to purchase, at an exercise price of $1.00 per share, a total of            
(      )
shares of common stock of Tyra Technologies, Inc., a California corporation ("Tyra")—a subsidiary of Advanced Enterprise Solutions, Inc., a Delaware corporation ("Company").
To have MSC assume your options, a two-step process is required: first, immediately prior to the time the Merger is closed, we must exchange your Tyra Options for options to purchase
Company's common shares ("Company Options"). Then, at the time of closing (the "Closing"), MSC will assume your Company Options. 

	 
	 
	 	 

	Tyra Options  -->  Company Options	  -->  Options to purchase MSC stock	 	 
	(immediately prior to Closing)	(at Closing)	 	 

The
reason for exchange of your Tyra Options for Company Options is that Company, not Tyra, will merge with MSC. Please note that your consent to the exchange of your Tyra Options for Company Options
will not in any way reduce the value of your options. Again, it is only a procedural requirement to
allow us to have your options assumed by MSC. 

Within
thirty (30) days following the Closing, MSC will send you a written notice setting forth the following: 

	(A)
	the
number of shares of MSC common stock subject to your assumed Company Options;

	(B)
	the
exercise price per share of MSC common stock issuable upon exercise of your assumed Company Options, and

	(C)
	the
lock-up agreement referred to in Section 3 below ("Lock-up Agreement"). 

2. Vesting  

Your
Company Options will be fully vested, conditional upon the Closing. Unless specifically modified or amended by this Agreement or the Lock-up Agreement, all other terms of your
original stock option agreement(s) will remain the same. 

3. Lock Up Period  

MSC
will require that you sign a Lock-up Agreement substantially in the form attached to this Agreement. Your lock-up period is reflected in the Lock-up Agreement.
The lock-up period will limit your ability to sell or otherwise dispose of the shares of MSC common stock acquired upon exercise of your options. 

4. Exchange Ratio  

Many
of you have been inquiring about the exchange ratio for your Tyra Options—that is, how many shares of MSC stock will be issuable in respect to each former Tyra Option following the
Merger. We cannot give you an exact ratio at this time because contingencies remain with respect to the valuation of AES. However, we estimate that ratio will be approximately 9.7 options to purchase
shares of MSC common stock for every one (1) Tyra Option. The ratio could be slightly lower or higher depending on certain contingencies. The exchange ratio will also be reflected in a pro rata
decrease in your exercise price. 

        Example for Illustration Purposes Only:  (Assuming a 9.7:1 exchange ratio) 

    Your
stock option agreement provides for an option to purchase 500 Tyra shares at an exercise price of $1.00 per share. 

    Immediately
prior to Closing, but subject to completion of the Merger, your Tyra Options are converted to Company Options, and at Closing, your Company Options will be assumed by MSC.
Assuming an exchange ratio of 9.7 to 1, you will then have a fully vested option to purchase 4850 shares of MSC common stock, at an exercise price per share of approximately 11 cents). 

5. Agreement Conditional upon Consummation of Merger  

This
Agreement is conditional upon consummation of the Merger. If the Merger does not close, this Agreement shall be null and void, and you will continue to hold Tyra Options under the terms and
conditions of your original stock option agreement(s). 

6. Tax Consequences  

AES
believes that conversion of your Tyra Options into Company Options and the subsequent assumption of your Company Options by MSC should not be taxable to you. However, the exercise of your assumed
Company Options for MSC stock following the Merger will have the same tax effects as if you exercised your Tyra Options. Generally, the difference between the exercise price and fair market value of
the MSC stock will be taxable to you just like any other compensation, and will be subject to withholding. Because your individual tax effects at the time of exercise will depend on your personal
circumstances, you are urged to consult your own tax advisor. 

7. Amendment & Waiver  

This
Agreement covers all of your Tyra or Company stock options and any other rights you may have with respect to the stock of Tyra, Company, or any other predecessor entity thereto (e.g., MicroCad).
You acknowledge and agree that the Tyra Options described above (which description includes the number of options and the exercise price) are correct and are the only rights you have with respect to
the stock of Tyra, Company or any other predecessor entity thereto. You hereby waive any and all rights or claims, whether or not existing, to any other stock options or other rights with respect to
the stock of Tyra, Company, or any predecessor entity thereto and any rights arising from, in connection
with, or with respect to the issuance of the Company Options and Tyra Options. This Agreement will constitute an amendment to your original stock option agreement(s), effective immediately prior to
the Merger, but subject to completion of the Merger, and you will receive no other documentation from 

Company or Tyra. You may receive replacement options from MSC and you agree to execute such other documents as Company, Tyra or MSC agree may be necessary to complete the exchanges described in this
Agreement. If the Merger does not occur, this Agreement shall be null and void. 

	 	 	Sincerely,

ADVANCED ENTERPRISE SOLUTIONS
	

 	
 	

 By: Nader Khoshniyati

President & CEO

BY
SIGNING BELOW, I ACKNOWLEDGE AND AGREE TO THE TERMS OF THIS AGREEMENT, INCLUDING, BUT NOT LIMITED TO, THE EXCHANGE OF MY TYRA OPTIONS FOR COMPANY OPTIONS, THE ASSUMPTION OF MY COMPANY OPTIONS BY
MSC, AND THE TERMS OF THE LOCK-UP AGREEMENT. 

	OPTIONEE	 	Consent of Spouse [if married]
	

 	
 	

 
	
 Signature	 	
 Signature
	

 	
 	

 
	
 Print Name	 	
 Print Name
	

 	
 	

 
	
 Date	 	
 Date

QuickLinks

Exhibit 4.1

LETTER AGREEMENT RE AES STOCK OPTIONSPrepared by MERRILL CORPORATION

QuickLinks
 -- Click here to rapidly navigate through this document

 
 

Exhibit 4.2    
  

August  ,
2001

[Name]

[Address]

Dear Optionee: 

    Pursuant
to the Letter Agreement RE AES Stock Options (the "Agreement") dated as of June 28, 2001, between you and Advanced Enterprise Solutions, Inc., MSC.Software
Corporation ("MSC") hereby notifies you of the following (all capitalized terms not defined herein will have the same meaning as set forth in the Agreement): 

Number of MSC Shares Subject to Assumed Company Options  

    Based on the number of Company Options that were held by you immediately prior to the Merger and were assumed by MSC in the Merger, you now hold options to
purchase            shares of MSC common stock. This number is based on the following calculation, as outlined in the Agreement: 

	 
	 	 
	 	 
	 	 
	 	 

	Tyra Option(s)	 	×	 	Exchange Ratio	 	=	 	Option(s) to purchase MSC common stock
	 	 	 	 	 	 	 	 	 
	
	 	×	 	9.72854	 	=	 	

Exercise Price Per Share  

    Your exercise price per share of MSC common stock issued upon exercise of the above-mentioned option(s) will be ten (10) cents. 

    Please
acknowledge receipt of this Notice by signing below and returning the Notice to the undersigned. Also, please sign and return the enclosed Lock-up Agreement. Copies
of this Notice and Lock-up Agreement are enclosed for your files. Please note that you must return to MSC copies bearing original signatures and that the receipt by MSC of a signed copy of
the Lock-up Agreement is a condition to the exercise of your options. If you have any questions regarding the above, please do not hesitate to contact the undersigned at
(714) 444-8638. 

	 	 	Sincerely,
	 	 	 
	 	 	MSC.SOFTWARE CORPORATION
	 	 	Margaret Williams

Chief Financial Officer

	 
	 	 

	ACKNOWLEDGED THIS

   DAY OF            , 2001	 	 
	 	 	 
	Signature:	 	 
	 	 	 
	Print Name:	 	 

QuickLinks

Exhibit 4.2Prepared by MERRILL CORPORATION

QuickLinks
 -- Click here to rapidly navigate through this document

 
 

Exhibit 4.3    
  

           ,
2001

MSC.Software Corporation

2 MacArthur Place

Santa Ana, California 92707

Ladies and Gentlemen: 

    The
undersigned, a holder of options (the "Options") to purchase MSC.Software Corporation ("Company") common stock by virtue of the assumption by Company of certain options to
purchase common stock of Advanced Enterprise Solutions, Inc. ("AES") in connection with the merger (the "Merger") of AES with and into a subsidiary of the Company, hereby agrees as follows: 

    (a) the
execution of this Lock-up Agreement is a condition to the exercise of the Options held by the undersigned; 

    (b) in
the event that the undersigned's options in Tyra Technologies, Inc. were unvested immediately prior to the Merger (excluding any vesting as a result of
the Merger or the transactions contemplated thereby), the undersigned will not offer to sell, sell or otherwise dispose of any shares of common stock of the Company issued upon exercise of the Options
until the later of (i) July  , 2003 or (ii) the original vesting date of such Options, in each case without the prior written consent of the Company; 

    (c) in
the event that the undersigned's options in Tyra Technologies, Inc. were vested immediately prior to the Merger (excluding any vesting as a result of the
Merger or the transactions contemplated thereby), the undersigned will not offer to sell, sell or otherwise dispose of (i) any shares of common stock of the Company issuable upon exercise of
the Options during the period from July  , 2001 until January  , 2002, (ii) greater than 25% of the total number of shares of common stock of the Company
issuable upon exercise of the Options in the period from January  , 2002 until July  , 2002, (iii) greater than 50% of the total number of shares of common stock
of the Company issuable upon exercise of the Options in the period from July  , 2002 until January  , 2003, and (iv) greater than 75% of the total number of
shares of common stock of the Company issuable upon exercise of the Options in the period from January  , 2003 until July  , 2003, in each case without the prior
written consent of the Company; and 

    (d) if
the undersigned's employment with Company or one of its affiliates is terminated by Company or its affiliates at any time (other than for Cause (as hereinafter
defined)), the lockup referred to in paragraphs (b) and (c) above shall be of no further force or effect. 

    For
the purposes hereof, "Cause" shall mean (i) the continued, unreasonable refusal or omission by the undersigned to perform any material duties required of him by the Company
or its affiliates if such duties are consistent with duties customary for the position held by the undersigned; (ii) any material act or omission by the undersigned involving malfeasance or
gross negligence in the performance of the undersigned's duties to, or material deviation from any of the policies or directives of, the Company or its affiliates; (iii) conduct on the part of
the undersigned which constitutes the breach of any statutory or common law duty of loyalty to the Company or its affiliates; or (iv) any illegal act by the undersigned which materially and
adversely affects the business of the Company or its affiliates or any felony committed by the undersigned, as evidenced by the conviction thereof. 

	 	 	 	 	 
	

 	
 	

 Name:

QuickLinks

Exhibit 4.3

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00029-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00029-of-00352.parquet"}], [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00029-of-00352.parquet"}]]