Document:

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                                                                   EXHIBIT 10.18

                          CHANGE OF CONTROL AGREEMENT

        This Change of Control Agreement (the "Agreement") is made and entered
into as of July 14, 2000 (the "Effective Date"), by and between McAfee.com, a
Delaware corporation (the "Company") and Evan Collins ("Executive").

                                    RECITALS

        The Company recognizes that the possibility of a change of control or
other event may occur which may change the nature and structure of the Company
and that uncertainty regarding the consequences of such events may adversely
affect the Company's ability to retain its key employees. The Company also
recognizes that the Executive possesses an intimate and essential knowledge of
the Company upon which the Company may need to draw for objective advice and
continued services in connection with any acquisition of the Company or other
change of control that is potentially advantageous to the Company's
stockholders. The Company believes that the existence of this Agreement will
serve as an incentive to Executive to remain in the employ of the Company and
will enhance its ability to call on and rely upon the Executive in connection
with a change of control.

        The Company and the Executive desire to enter into this Agreement in
order to provide additional compensation and benefits to the Executive and to
encourage Executive to continue to devote his full attention and dedication to
the Company and to continue his Change of Control with the Company.

        1. Definitions. As used in this Agreement, unless the context requires a
different meaning, the following terms shall have the meanings set forth herein:

               (a) "Business Combination" means:

                          (i) any "person" (as such term is used in Sections
13(d) and 14(d) of the Securities Exchange Act of 1934, as amended (the
"Exchange Act")), other than a trustee or other fiduciary holding securities of
the Company under an employee benefit plan of the Company or Network Associates,
becomes the "beneficial owner" (as defined in Rule 13d-3 promulgated under the
Exchange Act), directly or indirectly, of securities of the Company representing
fifty percent (50%) or more of (A) the outstanding shares of common stock of the
Company or (B) the combined voting power of the Company's then-outstanding
securities;

                          (ii) the Company is party to a merger or consolidation
which results in the holders of voting securities of the Company outstanding
immediately prior thereto failing to continue to represent (either by remaining
outstanding or by being converted into voting securities of the surviving
entity) at least fifty percent (50%) of the combined voting power of the voting
securities of the Company or such surviving entity outstanding immediately after
such merger or consolidation;

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                          (iii) the sale or disposition of all or substantially
all of the Company's assets (or any transaction having similar effect is
consummated); or

               (b) "Cause" means:

                          (i) theft, a material act of dishonesty, fraud, the
intentional falsification of any Change of Control or Company records or the
commission of any criminal act which impairs Executive's ability to perform his
duties under this Agreement;

                          (ii) breach of the name of Employee Inventions and
Proprietary Rights Assignment Agreement signed by Employee; or

                          (iii) continued violations by the Employee of the
Employee's obligations which are demonstrably willful and deliberate on the
Employee's part after there has been delivered to the Employee a written demand
for performance from the Company which describes the basis for the Company's
belief that the Employee has not substantially performed his duties.

               (c) "Change of Control" means:

                          (i) a change in the composition of the Board of
Directors of the Company occurring within a two-year period, as a result of
which fewer than a majority of the directors are Incumbent Directors. "Incumbent
Directors" shall mean directors who either (A) are directors of the Company as
of the date hereof, or (B) are elected, or nominated for election, to the Board
of Directors of the Company with the affirmative votes of at least a majority of
the Incumbent Directors at the time of such election or nomination (but shall
not include an individual not otherwise an Incumbent Director whose election or
nomination is in connection with an actual or threatened proxy contest relating
to the election of directors to the Company);

                          (ii) the dissolution or liquidation of the Company; or

                          (iii) a Business Combination of NETA (applying the
definition of Section 1(a) above but with regard to NETA (i.e., substituting
"NETA" for the "Company") while NETA owns at least 50.1% of the voting power of
the Company.

               (d) "Good Reason" means the occurrence of any of the following
conditions, without Executive's written consent, which condition(s) remain(s) in
effect twenty (20) days after written notice to the Board from Executive of such
condition(s):

                          (i) a five percent (5%) decrease in Executive's base
salary and/or a material decrease in Executive's bonus compensation or employee
benefits following a Change of Control;

                          (ii) a demotion, a material reduction in Executive's
position, responsibilities or duties, or a material, adverse change in
Executive's substantive functional responsibilities or duties, as measured
against Executive's position, responsibilities or duties immediately prior to
such change causing it to be of materially less stature or responsibility;

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                          (iii) in the event of the relocation of Executive's
work place for the Company to a location more than fifty (50) miles from the
Executive's principal place employment Control immediately prior to the Change
of Control;

                          (iv) any material breach of this Agreement by the
Company; or

                          (v) any failure or refusal of a successor company to
assume the Company's obligations under this Agreement as required by Section 14.

               (e) "Permanent Disability" means that:

                          (i) the Executive has been incapacitated by bodily
injury or disease so as to be prevented thereby from performing the essential
functions of the Executive's job with or without reasonable accommodation;

                          (ii) such total incapacity shall have continued for a
period of six consecutive months; and

                          (iii) such incapacity will, in the opinion of a
qualified physician, be permanent and continuous during the remainder of the
Executive's life.

               (f) "Termination Upon a Change of Control" means any termination
(i) of the Executive by the Company without Cause (A) within twelve (12) months
after the date of the closing of the Change of Control; or (B) after the signing
but before the closing of the Change of Control or (ii) by Executive for Good
Reason within 12 months after a Change of Control.

        "Termination Upon Change of Control" shall not include any termination
of employment of the Executive (a) by the Company for Cause; (b) by the Company
as a result of the Permanent Disability of the Executive; (c) as a result of the
death of the Executive; or (d) as a result of the voluntary termination of
employment by the Executive for reasons other than Good Reason within twelve
(12) months after the occurrence of any Change of Control.

               (g) "Total Annual Earnings" means the sum of the Executive's
annual salary excluding any bonus payments.

        2. Position and Duties. Executive shall continue to be an at-will
Executive of the Company employed in his current position at his then current
salary rate. Executive shall also be entitled to continue to participate in and
to receive benefits on the same basis as other executive or senior staff members
under any of the Company's employee benefit plans as in effect from time to
time. In addition, Executive shall be entitled to the benefits afforded to other
employees similarly situated under the Company's vacation, holiday and business
expense reimbursement policies. Executive agrees to devote his full business
time, energy and skill to his duties at the Company. These duties shall include,
but not be limited to, any duties consistent with his position which may be
assigned to Executive from time to time.

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        3. No Benefits Prior to a Change of Control. Except as provided
specifically herein, prior to a Change of Control, Executive's termination of
employment with the Company for any reason, including an involuntary termination
by the Company without Cause or Executive's voluntary termination of employment
with the Company for Good Reason, shall not entitle Executive to any
compensation or benefits from the Company other than those earned under Section
2 above through the date of Executive's termination of employment.

        4. Option and Restricted Stock Acceleration Prior to a Change of
Control. In the event that an acquiring company or any successor company does
not assume or substitute equivalent options for all outstanding stock options
granted by the Company to the Executive prior to the Change of Control, then (i)
such stock options shall become fully vested and exercisable immediately prior
to the Change of Control and the Company shall give Executive at least ten days
prior notice of such acceleration of vesting and (ii) any restricted stock of
the Company owned by Executive shall become fully vested and the Company's right
of repurchase shall lapse in full.

        5. Termination Upon a Change of Control. In the event of the Executive's
Termination Upon a Change of Control and Executive signing a Release of Claims
pursuant to Section 14 of this Agreement, Executive shall be entitled to the
following separation benefits:

                          (i) all salary, accrued but unused vacation earned
through the date of Executive's termination and Executive's target bonus for the
year in which termination occurs, pro rated through the date of Executive's
termination;

                          (ii) twelve (12) months of Executive's Total Annual
Earnings as in effect as of the date of such termination, less applicable
withholding, paid in a lump sum within thirty (30) days after the date of
Executive's termination upon a Change of Control;

                          (iii) all stock options granted by the Company to the
Executive prior to the Change of Control shall become fully vested and
exercisable as of the date of the termination to the extent such stock options
remain outstanding and unexercised at the time of such Termination Upon Change
of Control;

                          (iv) all restricted stock of the Company owned by
Executive shall be fully vested and any repurchase rights shall lapse;

                          (v) within reasonable time following submission of
proper expense reports by the Executive, the Company shall reimburse the
Executive for all expenses reasonably and necessarily incurred by the Executive
in connection with the business of the Company prior to his termination of
Change of Control;

                          (vi) reimbursement to the Executive for the same level
of health coverage and benefits as in effect for the Executive on the day
immediately preceding the day of the Executive's termination of employment with
the Company; provided, however, that (i) the Executive constitutes a qualified
beneficiary, as defined in Section 4980B(g)(1) of the Internal Revenue Code of
1986, as amended; and (ii) Executive elects continuation coverage pursuant to
the Consolidated Omnibus Budget Reconciliation Act of 1985, as amended
("COBRA"), within the time period

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prescribed pursuant to COBRA. The Company shall continue to reimburse Executive
for continuation coverage until the earlier of (i) the date Executive is no
longer eligible to receive continuation coverage pursuant to COBRA, or (ii) one
year from the termination date. Executive shall be responsible for the payment
of COBRA premiums (including, without limitation, all administrative expenses)
for the remaining COBRA period

                          (vii) Executive shall receive the benefits, if any,
under the Company's 401(k) Plan and other Company benefit plans to which he may
be entitled pursuant to the terms of such plans.

        6. Payment of Taxes. All payments made to Executive under this Agreement
shall be subject to all applicable federal state local and foreign (if
applicable) income, employment and payroll taxes.

        7. Exclusive Remedy. Under any claim for breach of this Agreement or
wrongful termination, the payments and benefits provided for in Section 5 shall
constitute the Executive's sole and exclusive remedy for any alleged injury or
other damages arising out of the cessation of the employment relationship
between the Executive and the Company in the event of Executive's termination.
Except as expressly set forth herein, the Executive shall be entitled to no
other compensation, benefits, or other payments from the Company as a result of
any termination of employment with respect to which the payments and/or benefits
described in Section 4 have been provided to the Executive.

        8. Proprietary and Confidential Information. The Executive agrees to
continue to abide by the terms and conditions of the Company's Employee
Proprietary Rights and Invention Assignment Agreement between the Executive and
the Company.

        9. Arbitration. Any claim, dispute or controversy arising out of this
Agreement, the interpretation, validity or enforceability of this Agreement or
the alleged breach thereof shall be submitted by the parties to binding
arbitration in Santa Clara County, California or elsewhere by mutual agreement.
The selection of the arbitrator and procedure shall be governed by the National
Rules for the Resolution of Change of Control Disputes of the American
Arbitration Association. The arbitrator shall be someone with an Change of
Control law background and from the AAA Commercial Arbitration Panel, or if both
parties agree, the Judicial Arbiters Group. Notwithstanding the above, this
arbitration provision shall not preclude either party from seeking injunctive
relief from any court having jurisdiction with respect to any disputes or claims
including any disputes or claims relating to or arising out of the misuse or
misappropriation of the Company's trade secrets or confidential and proprietary
information or the breach of any provisions by Executive of the Company's
confidentiality and/or proprietary rights agreement between the Executive and
Company. All costs and expenses of arbitration or litigation, including but not
limited to attorneys fees and other costs reasonably incurred by the Executive,
shall be paid by the Company. Judgment may be entered on the award of the
arbitration in any court having jurisdiction.

        10. Limitation of Payments and Benefits.

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               (a) In the event that the severance and other benefits provided
for in this Agreement or otherwise payable to the Employee (i) constitute
"parachute payments" within the meaning of Section 280G of the Internal Revenue
Code of 1986, as amended (the "Code") and (ii) but for this Section 5, would be
subject to the excise tax imposed by Section 4999 of the Code, then the
Employee's severance benefits under Section 3(a)(1) shall be either

                      (A)    delivered in full, or

                      (B)    delivered as to such lesser extent which would
                             result in no portion of such severance benefits
                             being subject to excise tax under Section 4999 of
                             the Code,

whichever of the foregoing amounts, taking into account the applicable federal,
state and local income taxes and the excise tax imposed by Section 4999, results
in the receipt by the Employee on an after-tax basis, of the greatest amount of
severance benefits, notwithstanding that all or some portion of such severance
benefits may be taxable under Section 4999 of the Code. Any taxes due under
Section 4999 shall be the responsibility of the employee.

               (b) If a reduction in the payments and benefits that would
otherwise be paid or provided to the Employee under the terms of this Agreement
is necessary to comply with the provisions of Section 5(a), the Employee shall
be entitled to select which payments or benefits will be reduced and the manner
and method of any such reduction of such payments or benefits (including but not
limited to the number of options that would vest under Section 3(a)) subject to
reasonable limitations (including, for example, express provisions under the
Company's benefit plans) (so long as the requirements of Section 5(a) are met).
Within thirty (30) days after the amount of any required reduction in payments
and benefits is finally determined in accordance with the provisions of Section
5(c), the Employee shall notify the Company in writing regarding which payments
or benefits are to be reduced. If no notification is given by the Employee, the
Company will determine which amounts to reduce. If, as a result of any reduction
required by Section 5(a), amounts previously paid to the Employee exceed the
amount to which the Employee is entitled, the Employee will promptly return the
excess amount to the Company.

               (c) Unless the Company and the Employee otherwise agree in
writing, any determination required under this Section 5 shall be made in
writing by the Company's Accountants immediately prior to Change of Control,
whose determination shall be conclusive and binding upon the Employee and the
Company for all purposes. For purposes of making the calculations required by
this Section 5, the Accountants may, after taking into account the information
provided by the Employee, make reasonable assumptions and approximations
concerning applicable taxes and may rely on reasonable, good faith
interpretations concerning the application of Sections 280G and 4999 of the
Code. The Company and the Employee shall furnish to the Accountants such
information and documents as the Accountants may reasonably request in order to
make a determination under this Section. The Company shall bear all costs the
Accountants may reasonably incur in connection with any calculations
contemplated by this Section 5.

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        11. Interpretation. Executive and the Company agree that this Agreement
shall be interpreted in accordance with and governed by the internal substantive
laws of the State of California, without regard to such state's conflict of laws
rules.

        12. Conflict in Benefits. This Agreement shall supersede all prior
arrangements, whether written or oral, and understandings regarding the subject
matter of this Agreement and shall be the exclusive agreement for the
determination of any payments and accelerated option vesting due upon
Executive's termination of employment or a Change of Control; provided, however,
that this Agreement is not intended to and shall not affect, limit or terminate
(i) any plans, programs, or arrangements of the Company that are regularly made
available to similarly-situated employees of the Company, (ii) any agreement or
arrangement with the Executive that has been reduced to writing and which does
not relate to the subject matter hereof, (iii) any indemnification rights
described below, or (iv) any agreements or arrangements hereafter entered into
by the parties in writing, except as otherwise expressly provided herein.

        13. Release of Claims. No benefits shall be paid to Executive under this
Agreement unless and until the Executive shall, in consideration of the payment
of such benefit, execute a release of claims in a form satisfactory to the
Company; provided, however, that such release shall not apply to any prior right
of Executive to be indemnified by the Company.

        14. Successors and Assigns.

               (a) Successors of the Company. The Company will require any
successor or assign (whether direct or indirect, by purchase, merger,
consolidation or otherwise) to all or substantially all of the business and/or
assets of the Company, expressly, absolutely and unconditionally to assume and
agree to perform this Agreement in the same manner and to the same extent that
the Company would be required to perform it if no such succession or assignment
had taken place. Failure of the Company to obtain such agreement prior to the
effectiveness of any such succession transaction shall be a breach of this
Agreement and shall entitle the Executive to terminate his Change of Control
with the Company within three months thereafter and to receive the benefits
provided under Section 5 of this Agreement in the event of Termination Upon a
Change of Control. As used in this Agreement, "Company" shall mean the Company
as defined above and any successor or assign to its business and/or assets as
aforesaid which executes and delivers the agreement provided for in this Section
15 or which otherwise becomes bound by all the terms and provisions of this
Agreement by operation of law.

               (b) Heirs of Executive. This Agreement shall inure to the benefit
of and be enforceable by the Executive's personal and legal representatives,
executors, administrators, successors, heirs, distributees, devises and
legatees.

        15. Notices. For purposes of this Agreement, notices and all other
communications provided for in the Agreement shall be in writing and shall be
deemed to have been duly given when delivered or mailed by United States
registered mail, return receipt requested, postage prepaid, as follows:

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                      If to the Company:            McAfee.com
                                                    3965 Freedom Circle
                                                    Santa Clara, CA  95054
                                                    Attn: General Counsel

and if to the Executive at the address specified at the end of this Agreement.
Notice may also be given at such other address as either party may have
furnished to the other in writing in accordance herewith, except that notices of
change of address shall be effective only upon receipt.

        16. No Representations. Executive acknowledges that he/she is not
relying and has not relied on any promise, representation or statement made by
or on behalf of the Company which is not set forth in this Agreement.

        17. Validity. If any one or more of the provisions (or any part thereof)
of this Agreement shall be held invalid, illegal or unenforceable in any
respect, the validity, legality and enforceability of the remaining provisions
(or any part thereof) shall not in any way be affected or impaired thereby.

        18. Modification. This Agreement may only be modified or amended by a
supplemental written agreement signed by Executive and the Company.

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        IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date and year written below.

                                        McAFEE.COM

Date: July 14, 2000                     By: /s/ Frank Gill
      -------------------                  -------------------------------------
                                        Title: Chairman - Compensation Committee

                                        EXECUTIVE:

Date: July 14, 2000                     /s/ Evan Collins
      -------------------               ----------------------------------------
                                        Executive's Signature

Address for Notice:
McAfee.com
-------------------------
535 Oakmead Parkway
-------------------------
Sunnyvale, CA 94085
-------------------------

                                      -8-<PAGE>   1
                                                                   EXHIBIT 10.19

             AMENDMENT NO.1 TO THE AMENDED AND RESTATED ELECTRONIC
                  SOFTWARE RESELLER/WEB SITE SERVICES AGREEMENT

This Amendment (this "Amendment") to the Amended and Restated Electronic
Software Reseller/Web Site Services Agreement dated as of May 17, 1999 (the
"Agreement") is made and entered into as of June 30, 2000, by and between
Beyond.com Corporation, a Delaware corporation, formerly known as Software.net
Corporation, located at 1195 West Fremont Avenue, Sunnyvale, California 94087
("Reseller") and McAfee.com Corporation, a Delaware corporation, located at 2805
Bowers Avenue, Santa Clara, California 95051 ("Vendor").

                                    RECITALS

        WHEREAS, Network Associates, Inc. ("NAI"), a Delaware Corporation and
the majority stockholder of Vendor, and Reseller entered into that certain Web
Site Services Agreement dated as of September 21, 1998 that was amended and
restated by the Agreement;

        WHEREAS, NAI and Reseller entered into that certain Co-Hosting Agreement
dated September 21, 1998 (the "Co-Hosting Agreement");

        WHEREAS, NAI assigned each of the Co-Hosting Agreement and the NAI
Amended and Restated Electronic Software Reseller/Web Site Services Agreement to
Vendor in connection with its spin-off of Vendor;

        WHEREAS, Vendor and Reseller agreed to terminate the Co-Hosting
Agreement in April 2000;

        WHEREAS, Vendor and Reseller wish to extend the term and otherwise amend
the Agreement as follows.

        NOW THEREFORE, in consideration of the foregoing, and of the mutual
covenants and agreements hereinafter set forth, the parties hereby agree as
follows:

1.      DEFINITIONS

        Unless otherwise set forth herein, all capitalized terms shall have the
meanings given them in the Agreement.

2.      VENDOR OBLIGATIONS.

(a)     Section 2(d) is hereby deleted in its entirety.

(b)     Section 2(e) is hereby deleted in its entirety.

<PAGE>   2

3.      RESELLER OBLIGATIONS

(a)     A new Section 3(f) is hereby added to read as follows:

        "FOREIGN SITES. Reseller and Vendor, or a subsidiary of Vendor, will
        discuss the terms and conditions by which Reseller can provide to Vendor
        at Vendor's European web sites currently located at www.McAfee.uk,
        www.McAfee.fr and www.McAfee.de, and all successor sites, similar
        services (adjusted, as appropriate, for local language and currency) as
        Vendor is currently providing to Reseller under this Agreement at
        Reseller's United States based web site. Upon reaching mutually
        acceptable terms and conditions for services at Foreign Sites, such
        terms and conditions shall be outlined in a separate contract."

4.      TERM AND TERMINATION.

(a)     Section 6(a) is hereby deleted in its entirety and replaced by the
        following:

        "TERM. The term of this Agreement as amended by Amendment No.1 hereto on
        the date hereof will be deemed to have commenced on May 17, 1999, and
        continue in effect until June 30, 2001, unless earlier terminated as
        herein provided."

(b)     Section 6(b1) is hereby deleted in its entirety and replaced by the
        following:

        "TERMINATION WITHOUT CAUSE. Vendor shall be entitled to terminate this
        agreement for any reason or for no reason upon ninety (60) days notice
        to Reseller. Reseller shall be entitled to terminate this agreement for
        any reason or for no reason upon ninety (60) days notice to Vendor."

5.      PAYMENTS.

(a)     Section 10(b) of Exhibit A to the Agreement is hereby deleted in its
        entirety and replaced with the following:

        "PAYMENT AND REPORTS. Within five (5) days after the end of each month,
        Reseller shall provide Vendor with a written report specifying the
        number of copies of Products that Reseller has shipped during the
        immediately prior month and the calculation of the Promotional Fee
        payable pursuant to Section 10(a) above together with payment therefor.
        The Per Copy License Fee shall be due net fifteen (15) days from invoice
        by Vendor."

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<PAGE>   3

6.      NO FURTHER AMENDMENT. The Agreement and each provision thereof shall
continue in full force and effect unless deleted or amended by this Amendment.
In the event of any inconsistency between the Agreement and this Amendment, this
Amendment shall control.

7.      ENTIRE AGREEMENT. The Agreement as amended by this Amendment sets forth
the entire agreement between the parties on the subject matters described herein
and therein and supercedes all prior agreements and understandings between the
parties.

8.      GOVERNING LAW. This Amendment will be governed and interpreted according
to the laws of the State of California, without reference to principles of
conflicts of laws. Each party hereto expressly consents to the personal
jurisdiction of the state and federal courts located in Santa Clara County,
California.

9.      ATTORNEY'S FEES. In the event of any litigation or arbitration
proceeding between the parties in connection with this Amendment the party not
prevailing therein shall pay the reasonable attorneys' fees and court costs of
the party prevailing therein.

10.     SEVERABILITY. If a court of law finds any provision of this Agreement
unenforceable, it shall be severed and the remaining provisions of this
Agreement shall remain in full force and effect.

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IN WITNESS WHEREOF, the parties have executed this Agreement as of the date set
forth above.

BEYOND.COM CORPORATION                       MCAFEE.COM CORPORATION
(Formerly known as Software.net)

By: /s/ Ronald S. Smith                      By:  /s/ Srivats Sampath
   --------------------------------              -------------------------------
Name: Ronald S. Smith                        Name: Srivats Sampath
      -----------------------------                -----------------------------
Title: President & CEO                       Title: President & CEO
       ----------------------------                 ----------------------------
Date:  August 4, 2000                        Date: August 4, 2000
       ----------------------------                -----------------------------

                                      -4-

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