Document:

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                                                                   EXHIBIT 10.15

                         EMBEDDED DISTRIBUTION AGREEMENT
                                   COVER PAGE

THIS EMBEDDED DISTRIBUTION AGREEMENT is entered into by and between BEA SYSTEMS,
INC. ("BEA") and DELTEK, INC. ("Licensee") as of 19 December 2000 (the
"Effective Date") and shall remain in effect until the date two years from the
Effective Date (the "Expiration Date"). This agreement consists of this Cover
Page and the Terms & Conditions and Pricing Schedule attached hereto and
incorporated herein by reference (collectively, the "Agreement").

Each of the undersigned represents and warrants that he or she is duly
authorized to sign this Agreement on behalf of the party he or she represents.
Each party has read, understands and agrees to the terms and conditions of this
Agreement.

                 BEA SYSTEMS, INC.             DELTEK, INC.
                 A Delaware corporation        A Delaware corporation
                 2315 North First Street       8280 Greensboro Drive, 3rd Floor
                 San Jose, California  95131   McLean, Virginia  22102
                 Attention:  Legal Counsel     Attention:  Director of Contracts
                 Phone:  408-570-8000          Phone:  703-734-8606
                 Fax: 408-570-8901               Fax: 703-734-0346
                 URL: http://www.bea.com       URL: http://www.deltek.com

        By:  /s/ William M. Klein              By:  /s/ Kenneth E. deLaski
             --------------------                   ----------------------

        Name: William M. Klein                 Name: Kenneth E. deLaski
              ----------------                       ------------------
        Title: Executive Vice President and    Title: President/CEO
               -----------------------------          -------------
               Chief Financial Officer
               -----------------------

<PAGE>   2

                               TERMS & CONDITIONS

1.      Definitions. For purposes of this Agreement the following terms shall
have the meanings set forth below:

1.1.    "BEA Software" shall include Development Software and Deployment
Software as defined below. Provided that Licensee is not in material breach of
this Agreement and is current in its payment of annual support fees, the BEA
Software covered by this Agreement shall also include the object code form of
any Maintenance Releases to which Licensee may be entitled.

1.2.    "Deployment Software" means the machine-readable, compiled, object code
form of, and associated documentation for, the BEA proprietary software named as
Deployment Software on a Pricing Schedule that is part of this Agreement.

1.3.    "Development Software" means the machine-readable, compiled, object code
form of, and associated documentation for, the BEA proprietary software named as
Development Software on a Pricing Schedule that is part of this Agreement.

1.4.    "End-User" means an entity that is not an affiliate of
Licensee's enterprise and acquires a license to the Value-Added Solution for its
Internal Use. "End User" does not include an entity that resells, sells,
licenses, rents, leases or otherwise distributes Deployment Software to any
other party in the regular course of business.

1.6.    "End-User License Agreement" means a written agreement between Licensee
and an End-User, which agreement is either signed by both parties or is in
"shrinkwrap" or "click-on" form, covering the licensing of a Value Added
Solution to such End-User. Such agreement must be materially consistent with,
and no less protective of BEA's proprietary and intellectual property rights in
the Deployment Software, than the terms of this Sublicense Addendum. Without
limitation, an End-User License Agreement must contain terms materially
consistent with the applicable provisions of the Restrictions Section of this
Agreement.

1.6.    "Internal Use" means using the Value-Added Solution on End-User's site
for internal business purposes only. Internal Use does not include use for
service bureau or application service provider purposes, nor does it include the
right to reproduce the Deployment Software for sublicensing, resale or
distribution to any third party, including without limitation distributing the
Deployment Software as part of a VAR, OEM, distributor or reseller arrangement.

1.7.    "Value-Added Solution(s)" means the Licensee products or services
described on a Pricing Schedule that is part of this Agreement. The Value-Added
Solution must add substantial commercial value to the Deployment Software, The
Value-Added Solution may be software into which the Deployment Software is
embedded or With which it is bundled and resold as a single technology solution,
or it may include an engagement for which Licensee is retained to provide
hardware, networking solutions, customer applications software, project
management (i.e., being hired by the End-User to oversee the technical
integration and/or testing of hardware, software and networking) and/or software
integration services in order to provide an End User with a custom solution to
address specific End User needs and goals, or it may include the service of

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                               TERMS & CONDITIONS
                                   (CONTINUED)

hosting the BEA Software. All Value-Added Solutions are subject to the
restrictions on development, use and distribution set forth in the Restrictions
Section of this Sublicense Addendum.

2.      LICENSE GRANT.

2.1.    Development License and Support. Subject to the terms of this Agreement,
BEA grants to Licensee a non-exclusive, non-transferable development license
("Development License") to use the Development Software as provided herein. The
Development License is perpetual subject to continued compliance with the terms
of this Agreement and worldwide subject to payment of any uplift applicable to
licenses deployed outside of the United States. Under the Development License
Partner may use the Development Software to (i) provide training on the use and
functionality of the Development Software to End Users and Licensee's sales and
technical personnel, provided such training is conducted solely on Licensee's
premises; and (ii) demonstrate Development Software to prospective End Users,
provided that Development Software installed at a prospective End User's
premises must be completely uninstalled within five (5) days; and (iii) design,
develop and/or test Licensee applications, on Licensee's premises only. Licensee
shall not under any circumstances attempt, or encourage any End-User or other
third party, to decompile, decipher, disassemble, reverse engineer or otherwise
decrypt or discover the source code for the Development Software. If Licensee
obtains notice that any End User is engaging or has engaged in any such attempt,
it shall promptly notify BEA of such attempt and promptly notify End-User to
cease and desist such attempt. Third party software as provided by BEA may only
be used by Licensee in accordance with the terms herein and may not be deployed
as a standalone product. Licensee may perform software performance benchmarks on
the Value - Added Solution incorporating the Deployment Software named on the
Pricing Schedule, but may not independently test any BEA Software or publish
such benchmarks without BEA's prior written consent. This Development License
and Support Section does not authorize Licensee to sublicense the Development
Software or use it to develop an application on behalf of an End User, for
production use, for any timesharing or service bureau arrangement or for any
other purpose that directly produces revenue for Licensee or an End User.

2.2.    Deployment License. Subject to the terms and conditions of this
Agreement, BEA grants Licensee a non-exclusive, non-transferable deployment
license ("Deployment License") to use the Deployment Software as provided
herein, The Deployment License is worldwide subject to any uplift applicable to
licenses deployed outside of the United States. Under the Deployment License
Partner may (i) integrate the Deployment Software into the Value-Added
Solution(s); and (ii) distribute the Deployment Software as integrated into the
Value-Added Solution(s) solely on Licensee's premises and solely for Internal
Use by End-Users who are subject to an End User Agreement. Licensee shall make
no other copies of the BEA Software, except for that limited number of copies as
may be reasonably necessary for backup and disaster recovery purposes. All
rights not specifically granted herein shall be retained by BEA. This license is
non-exclusive, with BEA reserving the right to license other partners without
restriction as to number and location. Licensee agrees not to decompile,
dissemble or otherwise reverse engineer, or attempt to determine the source code
of the Deployment Software.

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<PAGE>   4

2.3.    Restrictions. Licensee's rights under the License Section are, without
limitation on any other restrictions set forth in this Agreement, subject to the
following limitations and restrictions:

2.3.1.  Each Value-Added Solution licensed to End-Users must be developed so
that none of the API's of the Deployment Software are accessible to End-Users
either directly or via an abstraction on top of the API's;

2.3.2.  Each and every End-User Agreement shall provide that the End-User may
not under any circumstances attempt, or knowingly permit or encourage others to
attempt to decompile, decipher, disassemble, reverse engineer or otherwise
decrypt or discover the source code of all or any portion of the Value-Added
Solution;

2.3.3.  Each and every End-User Agreement shall provide that the End-User may
not under any circumstances use the Deployment Software or any of its API's in
any manner except indirectly in connection with the use of the Value-Added
Solution, and that the End User may not run any third party software on the
Deployment Software or any of its API's without first purchasing a license for
such use from BEA;

2.3.4.  Licensee may not, under any circumstances, license the Deployment
Software or any of its API's as standalone products;

2.3.5.  Licensee shall not integrate the Deployment Software with any products
other than the Value-Added Solutions named on the Pricing Schedule without first
obtaining BEA's prior written consent, which consent is not to be unreasonably
withheld

2.4.    Licensee Certification. Licensee represents and warrants to and for the
benefit of BEA that each Value-Added Solution will significantly enhance the
features and/or functionality of the BEA Software, and that each Value--Added
Solution is substantially different from any of BEA's products and does not
materially compete with any of BEA's products

2.5.    Ownership & Proprietary Notices. The BEA Software is licensed, not sold,
to Licensee. Except as specifically licensed to Licensee hereunder, BEA retains
all right, title and interest, including all intellectual property rights, in
and to the BEA Software. Licensee shall not remove, efface or obscure any
copyright notices or other proprietary notices or legends from any BEA Software
or BEA material provided hereunder, and shall reproduce all such notices and
legends when incorporating BEA Software into Value-Added Solutions.

2.6.    Branding and Quality Control.

2.6.1.  Logo License. Subject to the terms and conditions of this Agreement, BEA
grants Licensee a non--exclusive, non-transferable world-wide license to insert
and maintain the "Built on BEA" logo (the "Logo") within the Value-Added
Solution such that users of the Value-Added Solution are exposed to the Logo
during normal use of the product. If the Value-Added Solution is software, the
Logo shall at least be featured within such Value-Added Solution's startup
splash screen, under any "About' menu item describing the Value-Added Solution's
release details, and

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                               TERMS & CONDITIONS
                                   (CONTINUED)

within any "user login" dialog box of the Value-Added Solution. Licensee shall
insert and maintain the Logo within related marketing materials for the
Value-Added Solution including but not limited to printed and electronic
datasheets, direct mail, user documentation, product packaging, advertisements,
and Licensee's website. The Logo is available to Licensee at
http://partnernet.bea.com. Licensee acknowledges that the Logo is a registered
trademark of BEA, that Licensee is using this Logo under license from BEA and
that this Agreement grants to Licensee no proprietary rights in the Logo.
Licensee's use of the Logo must cease immediately on termination or expiration
of this Agreement.

2.6.2.  Quality Control. Upon BEA's reasonable request from time to time,
Licensee agrees to provide BEA with access to the Value-Added Solution(s)
bearing the Logo so that BEA can verify the quality of Licensee's use of the
Logo is comparable to that of BEA's use thereof. Licensee shall suspend use of
the Logo if such quality is objectively deemed inferior by BEA until Licensee
has taken such steps that BEA may reasonably require to improve the quality. The
Value-Added Solution bearing the Logo shall be of at least the same quality as
Licensee's other products of a similar nature, or, if Licensee has no other
products of a similar nature, the Value-Added Solution shall be of at least the
same quality as the average quality of other products of a similar nature which
are generally available to the public.

2.7.    Evidence of Compliance. Upon request of BEA, Licensee shall promptly,
and in any event within thirty (30) days, provide BEA with any and all evidence
reasonably necessary to confirm Licensee's compliance with the provisions of the
License Grant Section and its subsections.

2.8.    Delivery. BEA shall deliver the BEA Software to Licensee on compact disc
or by allowing Licensee to download the BEA Software from a designated website
and shall deliver code that will enable Licensee's use of the Deployment
Software as provided under this Agreement and make the Deployment Software
nonfunctional without the presence of a Value-Added Solution. Licensee agrees to
incorporate this code into the Value-Added Solution.

3.      FEES.

3.1.    Fees. Licensee shall owe to BEA License Fees, Support Fees and any other
fees as set forth on the Pricing Schedule. Unless otherwise explicitly stated in
this Agreement, the payment terms for all fees due under this Agreement are Net
30 days. Deployment License and Support

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                               TERMS & CONDITIONS
                                   (CONTINUED)

Fees will be paid on a calendar quarterly basis within 30 days after the end of
the quarter, BEA will generate an invoice for such Deployment License and
Support Fees based on a periodic Utilization Report, which Licensee agrees to
provide quarterly to BEA unless stated otherwise in the Pricing Schedule.
"Utilization Report" means a report containing the names and number of End-Users
using the Value-Added Solution and the amount of use in the previous quarter.
The Utilization Report will include shipments of any marketing, demonstration,
training or customer evaluation copies of the Deployment Software, for which no
license fees will be owed.

3.2.    Audit. Licensee agrees to maintain complete and accurate accounting
records, in accordance with generally accepted accounting practices, to support
and document all fees payable in connection with this Agreement for three (3)
years after the fees relating to such records have been accrued and paid.
Licensee agrees to allow BEA or an independent auditor to examine its records to
determine compliance or noncompliance with the Agreement. BEA will give Licensee
ten days or more prior written notice, and will conduct the examination during
regular business hours. If the examiner determines that Licensee is not in
material compliance with this Agreement, Licensee shall promptly remedy any such
non-compliance and will bear the expenses of the audit.

3.3.    Taxes. Licensee shall be responsible for any sales or use or other taxes
(other than taxes based on BEA's net income) to the extent that any such taxes
may arise in connection with this Agreement.

4.      WARRANTIES AND SUPPORT.

4.1.    Limited Warranty. BEA warrants that for a period of ninety (90) days
following delivery to Licensee, the BEA Software shall conform in all material
respects to its accompanying Documentation. BEA does not warrant that the BEA
Software will be error-free or will operate without interruption. If BEA
breaches the foregoing warranty and Partner promptly notifies BEA in writing of
the nature of the breach, BEA shall make commercially reasonable efforts to
promptly repair or replace the non-conforming BEA Software without charge. If,
after a reasonable opportunity to cure, BEA does not repair or replace the
non-conforming BEA Software, Partner must return the BEA Software and
accompanying documentation to BEA, or certify in writing that all copies have
been destroyed, and BEA will refund to Partner the fees it received for such BEA
Software. The foregoing is Partners sole and exclusive remedy for breach of this
Limited

4.2.    BEA Warranty Disclaimer. EXCEPT AS EXPRESSLY SET FORTH IN THE LIMITED
WARRANTY SECTION, BEA HEREBY DISCLAIMS ALL OTHER WARRANTIES EXPRESS, IMPLIED, OR
STATUTORY, WITH RESPECT TO THE BEA SOFTWARE, INCLUDING BUT NOT LIMITED TO
IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
NONINFRINGEMENT.

4.3.    Development Support. For one year from the Effective Date, BEA agrees to
provide Support Services for the Development Software ("Development Support") as
described in the Support Services Exhibit found on BEA's PartnerNet web page at
http://partnernet.bea.com. For the purposes of Development Support only, the
term "End User' in the Support Services Exhibit

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<PAGE>   7

shall apply to Licensee. Development Support will renew automatically at the
then-current fees and policies unless Licensee notifies BEA at least sixty (60)
days prior to the expiration of a support term of its desire to cancel
Development Support

4.4.    Deployment Support. Licensee will sell Support Services to each End User
to which it licenses Value--Added Solutions. Licensee is responsible for
providing such End Users with First Line Support, as described in the First Line
Support Exhibit posted at http://partnernet.bea.com and including but not
limited to (1) notifying BEA's support organization immediately by phone if an
End User has a Severity 1 Production Down support case, and (ii) providing
software installation and ongoing "how to" support to its End Users, and (iii)
diagnosing problems that require maintenance. Licensee represents that its staff
is trained to provide First Line Support. BEA reserves the right to require
Licensee to seek additional training, if, in BEA's opinion, Licensee's staff
requires such training. Provided that Licensee pays the Support Fees shown on
the Pricing Schedule, BEA will provide Back End Support to the two (2) Support
Contacts named on the Pricing Schedule, at the Support Level indicated on the
Pricing Schedule. For the purposes of defining Back End Support, the term "End
User" in the Support Services Exhibit shall apply to Licensee. Deployment
Support will renew automatically at the then-current fees and policies unless
Licensee notifies BEA at least sixty (60) days prior to the expiration of a
support term of its desire to cancel Deployment Support.

5.      INDEMNIFICATION.

5.1.    BEA Indemnity. BEA shall indemnify, defend and hold Licensee harmless
from and against any claim that the BEA Software as used within the scope of
this Agreement infringes the copyright, trademark, trade secret or United States
patent issued as of the Effective Date of any third party, provided that (i)
Licensee notifies BEA promptly in writing of the claim; (ii) BEA has sole
control of the defense and all related settlement negotiations; and (iii)
Licensee provides BEA with all necessary assistance, information, and authority
to perform the above.

5.2.    Exclusions. BEA shall have no liability for any claim of infringement
based on (i) use of other than the latest commercially available version of the
BEA Software provided to Licensee, to the extent the infringement would have
been avoided by use of such version; (ii) modification of the BEA Software by
Licensee to the extent the infringement would have been avoided without such
modification; or (iii) the combination or use of the BEA Software furnished
hereunder with materials not furnished by BEA to the extent such infringement
would have been avoided by use of the BEA materials alone.

5.3.    Alternatives. In the event the BEA Software is held to, or BEA believes
is likely to be held to, infringe any third party copyright, trademark, trade
secret or United States patent issued as of the Effective Date, BEA shall have
the right at its sole option and expense to (i) substitute or modify the BEA
Software so that it is non-infringing, while retaining equivalent features and
functionality; or (ii) obtain for Licensee a license to continue using the BEA
Software under commercially reasonable terms; or (iii) if (i) and (ii) are not
reasonably practicable, terminate this Agreement as to the infringing BEA
Software and return to Licensee any license fees paid by Licensee hereunder with
respect thereto; amortized over a period of three years, which period the
parties agree represents the useful life of the BEA Software.

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                               TERMS & CONDITIONS
                                   (CONTINUED)

5.4.    Sole Obligation. The foregoing states the sole obligation and exclusive
liability of BEA, and Licensee's sole recourse and remedy for any infringements
or claims of copyright and patent infringement by the BEA Software.

5.5.    Licensee Indemnity. Licensee agrees to indemnify, defend and hold BEA
harmless from and against any costs, losses, liabilities, claims or expenses
(including attorneys' fees) arising out of (i) any claim that any Value-Added
Solution infringes on the intellectual property or proprietary rights of any
third party, except to the extent such infringement is caused solely by the BEA
Software; or (ii) the distribution of any Value-Added Solution by Licensee or
any third party, except to the extent such claim is for improper distribution of
sublicenses of third party software provided solely by BEA as part of the BEA
Software that BEA was not authorized to provide; or (iii) the use of any
Value-Added Solution by any End-User or third party, except to the extent such
claim is for improper use of sublicenses of third party software provided solely
by BEA as part of the BEA Software that BEA was not authorized to provide.

6.      Term and Termination. This term of this Agreement shall be from the
Effective Date to the Expiration Date unless earlier terminated as provided
below. Either party may terminate this Agreement for cause if such cause is not
cured within 30 days of written notice thereof. Cause for termination shall
include but not be limited to breach of a material obligation, bankruptcy or
insolvency, or failure to pay. Upon termination of this Agreement, all
distribution licenses granted to Licensee pursuant to this Agreement shall
automatically terminate. The foregoing notwithstanding, any Development Licenses
or licenses properly granted to End Users under this Agreement shall remain in
effect so long as such licenses are used in accordance with the respective
license grant. This section and the Confidentiality, Limitation of Liability,
Consequential Damages Waiver, BEA Warranty Disclaimer, Miscellaneous and
Definitions Sections and any outstanding obligations to submit any reports or
pay any fees shall survive termination or expiration of this Agreement.

7.      Confidentiality. Except as expressly provided otherwise in this
Agreement, Licensee will hold all BEA Software in strict confidence. BEA and
Licensee will hold in strict confidence the terms of this Agreement and any
other information provided by one party to the other under this Agreement and
identified as confidential or defined herein as Confidential Information. If the
parties have signed a mutual non-disclosure agreement ("NDA") within six (6)
months prior to the Effective Date, the terms and conditions of such NDA are
hereby incorporated herein by reference.

8       Limitation of Liability. BEA's entire liability to Licensee for damages
in any way relating to this Agreement, regardless of the cause of action, shall
not exceed the amounts received by BEA under this Agreement.

9.      Consequential Damages Waiver. IN NO EVENT SHALL BEA BE LIABLE FOR ANY
INCIDENTAL, CONSEQUENTIAL, PUNITIVE OR SPECIAL DAMAGES, LOST PROFITS OR LOST
DATA, OR ANY OTHER INDIRECT DAMAGES, EVEN IF BEA HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. BEA shall have no liability with respect to claims
relating to or arising from the use of non-BEA products or services, even if BEA
recommended, referred or introduced Licensee to such products or services.

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<PAGE>   9

10.     Miscellaneous. BEA and Licensee are independent contractors. Licensee
may not assign this Agreement by operation of law or otherwise, without the
prior written consent of BEA, such consent not to be unreasonably withheld. All
notices between the parties shall be in writing and shall be sent by personal
delivery or certified or registered mail (return receipt) to the address on the
Cover Page. The laws of the State of California, other than choice of law rules,
will govern this Agreement. Any dispute regarding this Agreement shall be
subject to the exclusive jurisdiction of the Santa Clara County, California
state or federal courts. Licensee agrees that the BEA Software is the valuable,
proprietary and confidential property of BEA, and that any unauthorized use or
disclosure of the BEA Software would cause BEA irreparable injury for which it
would have no adequate remedy at law, and that BEA will be entitled to
preliminary and other injunctive relief against any such unauthorized use or
disclosure, in addition to any other remedies or rights that BEA might have.
Licensee may not download, export or re-export the BEA Software except in
compliance with all applicable laws and regulations, including United States
export control restrictions. It is Licensee's responsibility to comply with such
restrictions as they may be amended from time to time. If any provision of this
Agreement is held to be illegal, unenforceable or void, then each other
provision will remain in effect. No failure of either party to enforce any
provision of this Agreement shall be construed as a waiver of that or any other
provision. This Agreement sets forth the entire agreement between the parties on
the subject matter hereof and supersedes all prior proposals, agreements and
representations between them, whether written or oral. This Agreement supersedes
any conflicting terms in any purchase order or other document submitted by
Licensee, whether or not formally rejected by BEA, This Agreement may be changed
only in writing signed by both parties.

                                       9<PAGE>   1
                                                                  EXHIBIT 10.3.4

                                                                  EXECUTION COPY

                     AMENDMENT NO. 1 TO EMPLOYMENT AGREEMENT

         This AMENDMENT NO. 1 TO EMPLOYMENT AGREEMENT (this "Amendment") is
dated as of February 16, 2001 between Henry R. Nothhaft ("Executive") and XO
Communications, Inc. ("Employer").

         WHEREAS, Executive and Employer are parties to an Employment Agreement
dated as of June 16, 2000 (the "Employment Agreement")(capitalized terms used in
this Amendment without definition shall have the meanings set forth in the
Employment Agreement); and

         WHEREAS, Executive and Employer wish to amend the Employment Agreement
in certain respects as set for this Amendment.

         NOW THEREFORE, in consideration of the premises and the mutual
covenants hereinafter set forth and other good and valuable consideration, the
receipt and sufficiency of which is hereby acknowledged, the parties hereto
hereby agree as follows:

1.       AMENDMENT TO SECTION 2 OF THE EMPLOYMENT AGREEMENT. The Employment
Agreement is amended by deleting Section 2 in its entirety and by substituting
in lieu thereof the following:

         "2.      EMPLOYMENT PERIOD

                  Subject to earlier termination as provided in section 5, the
         term of Executive's employment under this Agreement shall commence as
         of the Effective Date and shall continue until December 31, 2001 (the
         "Employment Period").

2.       AMENDMENT TO SECTION 3 OF THE EMPLOYMENT AGREEMENT. The Employment
Agreement is amended by deleting Section 3 in its entirety and by substituting
in lieu thereof the following:

                  "During the Employment Period, Executive shall hold the office
         of Vice Chairman of the Board of Directors and shall devote such hours
         as may be reasonably necessary to perform his duties hereunder (it
         being agreed that from and after April 1, 2001 there shall be no
         obligation on Executive to devote more that 10 hours per week for such
         purpose) and during those hours shall devote all of his business time
         and expend his best efforts, energies and skills to the Employer. It is
         acknowledged and agreed that the Executive shall be allowed to serve on
         (i) the Board of Directors of Asia Online, Ltd., Vertical Networks
         Incorporated and WaveSplitter Technologies, Inc., (ii) the
         Telecommunications Advisory Board of Compaq Computer Corp. and (iii)
         the Technical Advisory Board of SonicWALL, Inc. and on such other
         Boards of Directors and Advisory Boards as are approved by the Chief
<PAGE>   2
         Executive Officer of the Employer (the "CEO"), or his designee, so long
         as such service does not materially interfere with Executive's duties
         and responsibilities hereunder. In addition, Executive shall be
         permitted to engage in certain investments as a venture capitalist or
         angel investor as approved by the CEO, or his designee, so long as such
         investment does not materially interfere with Executive's duties and
         responsibilities hereunder. For purposes of obtaining the approval of
         the CEO, or his designee, with respect to service on various Boards of
         Directors and Advisory Boards and investment activities as set forth
         above, permission will be deemed to be given by the CEO on the fifth
         day following written notice by Executive to the CEO, unless prior to
         such date the CEO provides written notice to the Executive of his
         disapproval. The notice required in this Section 3 may be sent via
         electronic mail, in which case such notice will be deemed given when
         actually received in the designated party's electronic inbox. Executive
         shall perform such duties as he may be assigned from time to time by
         the Board of Directors of the Employer (the "Board"), the Chief
         Executive Officer of the Employer or any officer of the Employer senior
         in rank to Executive."

3.       AMENDMENT TO SECTION 4.1 OF THE EMPLOYMENT AGREEMENT. The Employment
Agreement is amended by deleting Section 4.1 in its entirety and by substituting
in lieu thereof the following:

                  "4.1 Base Salary. For the nine-month period commencing April
         1, 2001 and ending December 31, 2001, Employer shall pay to Executive
         an annual base salary equal to $120,000 (the "Base Salary"). The Base
         Salary shall be payable in accordance with the Employer's normal
         payroll practices."

4.       AMENDMENT TO SECTION 4.2 OF THE EMPLOYMENT AGREEMENT. The Employment
Agreement is amended by deleting Section 4.2 in its entirety and by substituting
in lieu thereof the following:

                  "4.2 Annual Bonus. For the fiscal year ended December 31,
         2000, at the sole discretion of the Employer, Executive may receive a
         bonus (the "Bonus") based upon attainment of annual performance
         objectives to be established in the sole discretion of the Employer for
         the Bonus year. Executive shall not be entitled to receive a Bonus for
         the fiscal year ended December 31, 2001."

5.       ACKNOWLEDGEMENT AND AGREEMENT REGARDING RIGHTS UNDER SECTION 5.3 OF THE
EMPLOYMENT AGREEMENT AND UNDER EXECUTIVE RETENTION BONUS PLAN.

                  (a) Executive acknowledges and agrees that the modifications
         to the Employment Agreement contained in this Amendment shall not
         constitute "Good Reason" for purposes of

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<PAGE>   3
         Section 5.3 of the Employment Agreement, that nothing contained in this
         Amendment shall give rise to any right on behalf of Executive to
         terminate the Employment Period pursuant to Section 5.3 of the
         Employment Agreement and that, for purposes of the definition of "Good
         Reason" in the Employment Agreement, he is consenting to the
         modifications to his employment arrangements contemplated by this
         Amendment.

                  (b) Executive and Employer agree that for purposes of
         determining the vesting of unvested shares of Restricted Stock and
         payment of any unpaid amounts of Executive's Cash Bonus Target pursuant
         to the Executive Retention Bonus Plan as it relates to that portion of
         such shares and bonus that are earned based on the satisfaction of
         performance standards for the year 2001, if Executive continues his
         employment throughout the remainder of the Term, such shares shall
         continue to vest and become transferable and no longer subject to
         forfeiture and the payment of any unpaid portion of such Cash Bonus
         Target shall be paid at the times set forth in the Executive Retention
         Bonus Plan, but only to the degree that the Performance Goals in the
         Executive Retention Bonus Plan are met, as though Executive were still
         employed with the Employer on the date or dates of such vesting without
         regard to whether Executive is so employed. The provisions of this
         Section 5(b) shall not affect any rights Executive may have pursuant to
         Section 6.1 of the Employment Agreement.

6.       AMENDMENT TO SECTION 8 OF THE EMPLOYMENT AGREEMENT. The Employment
Agreement is amended by deleting the fourth full sentence of Section 8 in its
entirety and by substituting in lieu thereof the following:

                  "For purposes of obtaining the approval of the CEO, or his
         designee, with respect to certain investment activities as a venture
         capitalist or angel investor, as set forth above, permission will be
         deemed to be given by the CEO on the fifth day following written notice
         by Executive to the CEO, unless prior to such date the CEO provides
         written notice to the Executive of his disapproval."

7.       VACATION ACCRUAL. Executive acknowledges and agrees that under
Employer's vacation accrual policies Executive will cease to accrue vacation as
of April 1, 2001. The parties agree that Executive shall retain all rights under
Employer's vacation policy with respect to vacation accrued prior to April 1,
2001.

8.       CONFIRMATION OF EMPLOYMENT AGREEMENT. Except as specifically amended by
this Agreement, the Employment Agreement shall remain in full force and effect
and is hereby ratified and confirmed.

                                     - 3 -
<PAGE>   4
9.       GOVERNING LAW. This Amendment shall be governed by and construed and
enforced in accordance with the laws of the State of Delaware, without reference
to the principles of conflicts of laws therein.

10.      HEADINGS. All descriptive headings in this Amendment are inserted for
convenience only and shall be disregarded in construing or applying any
provision of this Amendment or the Employment Agreement.

11.      COUNTERPARTS. This Amendment may be executed in counterparts, each of
which shall be deemed to be an original, but all of which together shall
constitute one and the same instrument.

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the date first above written.

                                       XO COMMUNICATIONS, INC.

                                       By: /s/ Gary D. Begeman
                                           -----------------------------------
                                       Name: Gary D. Begeman

                                       Title: Senior Vice President

                                        /s/ Henry R. Nothhaft
                                       ---------------------------------------
                                       Henry R. Nothhaft

                                     - 4 -

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