Document:

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                                                                   EXHIBIT 10.41

                                LEASE AMENDMENT

This document amends the Lease Agreement dated November 14, 1996 and amended
November 24, 1997, March 27, 1998, June 4, 1998, July 21, 1998, November
20, 1998, March 18, 1999, and June 3, 1999 by and between Blue Lake Partners,
Ltd. ("Landlord"), and McAfee Software, Inc., a Delaware Corporation ("Tenant"),
for the Premises located at 4099 McEwen, Suites 405, 500, 620, 660, 700, 850 and
800, and 4101 McEwen, Suites 100, 270, 300, 700 and 810, Dallas, Texas 75244 as
follows:

COMMENCEMENT DATE

Landlord and Tenant confirm and agree that the Commencement Date for Suite 800
at 4101 McEwen shall be September 1, 1999 and the Commencement Date for Suite
700 at 4101 McEwen shall be February 1, 2000.

EXHIBIT "D"

Effective September 1, 1999, Tenant shall have access to Suite 700 at 4101
McEwen for the purpose of constructing its Tenant Improvements and installing
fixtures, furniture, and data, telephone and network/computer cabling.

GENERATOR

Tenant shall have sole rights and use of the generator (formerly used by
Unisource) located on the roof of the 4101 McEwen Building. Section 6.201,
Tenant's Obligation, of Article 6 of the Lease, shall be amended such that
Tenant's Obligations for maintenance and repair shall include the generator, at
such intervals and at such time reasonably required by Landlord. Additionally,
Tenant acknowledges that the use of the generator is an Additional Service and
agrees all electrical expenses incurred shall be considered Excess Consumption
Costs and agrees to pay for such Excess Consumption Costs pursuant to Article 5
of the Lease. In addition, at the expiration or earlier termination of the
Lease, the generator shall be surrendered with the Premises. Any testing of the
generator shall be conducted during non-business hours unless otherwise approved
by Landlord.

BASIC LEASE PROVISION NO. 11 "TENANT'S BROKER"

Tenant represents and warrants that it has dealt with no Broker or Agent in
connection with the execution of this Lease Amendment and Tenant agrees to
indemnify and hold harmless Landlord against all liabilities and costs arising
from a breach of such warranty including without limitation attorney's fees in
connection therewith.

Submission of this instrument for examination or signature by Tenant is not
effective until execution by and delivery to both Landlord and Tenant.

All other terms and conditions shall remain the same and in full force and
effect.

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EXECUTED the 7th day of October, 1999.

                        LANDLORD: Blue Lake Partners, Ltd.

                        By:  SF Realty, Inc.
                        Its: General Partner

                        By: /s/ MARK HARRISON
                           --------------------------------
                           Mark Harrison
                           Leasing Manager

                        TENANT: McAfee Software, Inc.
                                (a Delaware Corporation)

                        By: /s/ PRABHAT GOYAL
                           --------------------------------
                           Prabhat Goyal, CFO

                                       2<PAGE>
                                                                   EXHIBIT 10.42

                                 LEASE AMENDMENT

        This document amends that certain Lease Agreement dated November 14,
1996 (the "LEASE"), as amended November 24, 1997, March 27, 1998, June 4, 1998,
July 21, 1998, November 20, 1998, March 18, 1999, June 3, 1999, and October 7,
1999 is made and entered into by and between DALTEX CENTRE LP, a Delaware
limited partnership (the "LANDLORD"), successor in interest to Blue Lake
Partners, Ltd., AND NETWORK ASSOCIATES, INC., A DELAWARE CORPORATION, SUCCESSOR
IN INTEREST TO MCAFEE SOFTWARE, INC., A DELAWARE CORPORATION (Tenant), with
respect to certain leased premises (the "PREMISE") consisting of approximately
112,130 square feet of Rentable Area located at 4099 McEwen, Suites 405, 500,
620, 660, 700, 800, 850, and 4101 McEwen, Suites 100, 270, 300, 700, and 800
Dallas, Texas 75244 (the "BUILDING"). (All capitalized terms used herein shall
have the same meaning as in the Lease, unless otherwise specified.)

                                    RECITALS

        Tenant is leasing approximately 112,130 square feet of Rentable Area of
the Building under the Lease, with a scheduled expiration date of February 17,
2003. Tenant desires to expand the Premises by adding Suite 550 containing 4,607
rsf, Suite 545 containing 4,118 rsf, Suite 506 containing 2,357 rsf, and Suite
510 containing 1,176 rentable square feet (see Exhibit A), subject to the terms
and provisions set forth hereinafter. The Premises will now total 124,388
rentable square feet.

                                   AGREEMENTS

        For good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, Landlord and Tenant agree as follows:

        1. BASIC LEASE PROVISION NO. 2 "PREMISES". Effective July 1, 2000,
Tenant shall lease Suites 550, 545, 506, and 510 (consisting of 12,258 rentable
square feet) in the 4101 McEwen Building within The Centre office complex while
maintaining all its then current space at 4099 and 4101 McEwen. Tenants amended
square footage will total 124,388 rentable square feet for both Buildings.
Tenant shall have early access rights for construction and occupancy after May
1, 2000 upon execution of this Amendment.

        2. BASIC LEASE PROVISION NO. 9 "EXPIRATION DATE". The Lease Term for the
124,388 rentable square feet area shall remain unchanged with an expiration date
of February 17, 2003.

        3. BASIC LEASE PROVISION NO. 3 "BASIC RENT". Effective June 1, 2000, the
monthly Rental Payment shall adjust as follows:

<Table>
<Caption>
S.F.            DATES:                                    MONTHLY BASE RENT
-------         ------                                    -----------------
<S>             <C>                                       <C>
124,388         June 1, 2000 thru January 31, 2002        $193,430.00
                February 1, 2002 thru February 17, 2003   $198,058.00
</Table>

        4. BASIC LEASE PROVISIONS NO. 4 "TENANT'S PRO RATE SHARE $". Effective
February 1, 2000, Tenant's proportionate share of the 4099 McEwen Building shall
be unchanged at 46.16% for all purposes under this Lease. Tenant's proportionate
share of the 4101 McEwen Building shall be amended to 54.09% for all purposes
under this Lease. Notwithstanding, "Tenant's Pro Rata Share", at the option of
Tenant, shall be amended subsequently pursuant to the Reduction Options set
forth in the prior amendment.

        5. BASIC LEASE PROVISION NO. 5 & 6 "OPERATING EXPENSE STOP". Effective
June 1, 2000, Expense Stop for the expansion space on the 5th floor of 4101
McEwen shall be set at an amount equal to the sum of the actual grossed up
operating expenses for 2000, expressed as a function of 124,326 rentable square
feet for the 4101 McEwen Building.

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6.   BASIC LEASE PROVISION NO. 11 "TENANT'S BROKER".  Tenant represents and
warrants that it has dealt with no Broker or Agent in connection with the
execution of this Lease Amendment and Tenant agrees to indemnify and hold
harmless Landlord against all liabilities and costs arising from a breach of
such warranty including without limitation attorney's fees in connection
therewith.

8.   RIGHT OF FIRST REFUSAL:  Notwithstanding herein to the contrary, Tenant
shall, subject to prior rights within the 4101 McEwen Building, have a Right of
First Refusal to lease any remaining space in the 4101 McEwen Building during
the term of this Lease. Tenant shall respond in writing to Landlord within five
(5) business days after receipt of Landlord's written notice of any prospective
lease in the 4101 McEwen building. Absent of any response from Tenant or if
Tenant decides not to exercise such rights, Landlord shall be free to lease
such space to any other party.

9.   EXHIBIT "D". EXHIBIT D.  Work Letter Plans Agreed Upon/Finish Allowance,
paragraph 2.1, shall be amended such that Landlord shall provide an allowance
up to $53,077.00 for Suites 550, 545, 506, and 510 at 4101 McEwen (The "Finish
Allowance").

10.  FORCE AND BINDING EFFECT; GOVERNING LAW:  Except as modified hereby and by
the Amendments to Lease Agreement, all other terms and conditions of the Lease
shall remain in full force and effect and this Amendment shall continue to be
binding upon Landlord and Tenant and their respective successors and assigns.
The Lease and this Amendment shall be governed by Texas law.

11.  RENEWAL OPTION.  This expansion space (4101 McEwen, Suites 550, 545, 506,
and 510) shall be subject to the same renewal option as the existing premises.

     Executed on this 25 day of March 2000.

LANDLORD:                     DALTEX CENTRE LP, a Delaware limited partnership,
                              successor in interest to Blue Lake Partners, Ltd.

                              By:  DALTEX CENTRE GP, Inc.

                              By:  /s/ RON CHERRY
                                 --------------------------------
                              Name:  Ron Cherry
                              Title:  Vice President

                              By:  /s/ JEAN FRANCIOS FOURNIER
                                 --------------------------------
                              Name:  Jean Francios Fournier
                              Title:  Vice President

TENANT:                       NETWORK ASSOCIATES, INC.
                              (A DELAWARE CORPORATION)

                              By:  /s/ PRABHAT K. GOYAL
                                 --------------------------------
                              Name:  Prabhat K. Goyal
                              Title:  CFO

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                                   EXHIBIT "A"

(SEE ATTACHED FLOOR PLANS)

                                   [GRAPHIC]

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