Document:

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                                                                    EXHIBIT 10.4

March 1, 2002

Thomas Oberdorf
49 Miller Circle
Armonk, NY 10504

Dear Tom:

It is a distinct pleasure to offer you the position of Chief Financial Officer
and Treasurer of CMGI, Inc. ("CMGI" or the "Company"). In this capacity you will
report to George McMillan, Chief Executive Officer, CMGI.

Your starting salary will be $12,500 bi-weekly, which is equivalent to an
annualized base salary of $325,000. You will also be eligible to receive a
pro-rated bonus for fiscal year 2002 based on a target annualized bonus of
$162,500. This bonus will be based on successful satisfaction of fiscal year
2002 business objectives pursuant to the terms and conditions of CMGI's FY 2002
Bonus Plan for CMGI Corporate. Your target annualized bonus for fiscal year 2002
will be 50% of your base salary.

You are eligible for relocation benefits up to a maximum of $150,000. These
benefits are outlined in CMGI's Relocation Policy, which is attached for your
reference. All relocation will be coordinated through MSI, the relocation vendor
for the Company. Please contact Joyce Fantasia to initiate the relocation
process. Should you take advantage of these benefits, and terminate either
voluntarily or for cause (as defined below), during the first year following
your effective date of hire, 100% of all funds provided to you for relocation
will be immediately repayable to the Company. If you terminate either
voluntarily or for cause during the second year following your effective date of
hire, 50% of the total funds provided to you will be immediately repayable to
the Company.

For purposes of this offer letter, "cause" shall mean a good faith finding by
the Company of: (i) gross negligence or willful misconduct by you in connection
with your employment duties, (ii) failure by you to perform your duties or
responsibilities required pursuant to your employment, after written notice and
an opportunity to cure, (iii) misappropriation by you of the assets or business
opportunities of the Company or its affiliates, (iv) embezzlement or other
financial fraud committed by you, (v) you knowingly allowing any third party to
commit any of the acts described in any of the preceding clauses (iii) or (iv),
or (vi) your indictment for, conviction of, or entry of a plea of no contest
with respect to, any felony.

In addition, on your start date, you will be granted an option to purchase
750,000 shares of CMGI common stock under the CMGI 2000 Stock Incentive Plan
(the "Plan"). This option will be priced at the closing price on the date of
grant and it will be divided into three tranches. The first tranche of the
option shall cover 350,000 shares and shall vest as follows: 25% on the earlier
to occur of (i) the first anniversary of the date of grant and (ii) the First
Confirmation Date (as defined below), and monthly thereafter commencing on the
13th monthly anniversary of the date of grant for the next three (3) years
(whereby 1/48th of the original number of the shares underlying the first
tranche of the option shall vest

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on each monthly anniversary date of the date of grant starting on the 13th
monthly anniversary date of the date of grant, until fully vested on the fourth
anniversary of the date of grant). The option shall have a seven (7) year term.

The second tranche of the option shall cover 250,000 shares and shall vest as
follows: 25% on the first anniversary of the First Confirmation Date and monthly
thereafter for the next three (3) years (whereby 1/48th of the original number
of the shares underlying the second tranche of the option shall vest on each
monthly anniversary date of the First Confirmation Date starting on the 13th
monthly anniversary date of the First Confirmation Date, until fully vested on
the fourth anniversary of the First Confirmation Date). Notwithstanding the
foregoing, in the event that the First Confirmation Date does not occur prior to
the fifth anniversary of the date of grant, the second tranche of the option
shall nonetheless become fully vested on such date. For purposes of this offer
letter, "First Confirmation Date" shall be defined as the first date following
the date of grant that CMGI publicly announces Net Operating Income (as defined
below) on a consolidated basis for a fiscal quarter commencing after the date of
grant greater than zero dollars.

The third tranche of the option shall cover 150,000 shares and shall vest as
follows: 25% on the first anniversary of the Second Confirmation Date (as
defined below) and monthly thereafter for the next three (3) years (whereby
1/48th of the original number of the shares underlying the option shall vest on
each monthly anniversary date of the Second Confirmation Date starting on the
13th monthly anniversary date of the Second Confirmation Date, until fully
vested on the fourth anniversary of the Second Confirmation Date).
Notwithstanding the foregoing, in the event that the Second Confirmation Date
does not occur prior to the fifth anniversary of the date of grant, the third
tranche of the option shall nonetheless become fully vested on such date. For
purposes of this offer letter, "Second Confirmation Date" shall be defined as
the first date following the First Confirmation Date that CMGI publicly
announces Net Operating Income on a consolidated basis for a fiscal quarter
greater than that reached on the First Confirmation Date. .

For purposes of this offer letter, "Net Operating Income" shall be defined as
operating income excluding expenses related to in-process research and
development, depreciation, restructuring, long-lived asset impairment and
amortization of intangible assets and stock-based compensation.

All options described above shall be subject to all terms, limitations,
restrictions and termination provisions set forth in the Plan and in the
separate option agreements (which shall be based upon the Company's standard
form option agreement) that shall be executed to evidence the grant of such
options. Enclosed you will find a copy of a Non-Competition Agreement, the
execution of which is required as a condition of the Company granting you an
option to purchase CMGI common stock and your employment with the Company.
Additionally, as a condition of employment with CMGI, you are required to
execute the enclosed Non-Disclosure and Developments Agreement.

As an employee of CMGI, you may participate in any and all bonus and benefit
programs that the Company establishes and makes generally available to its
employees from time to time, provided you are eligible under (and subject to all
provisions of) the plan documents governing those programs. Details of the
benefits offered will be reviewed with you in orientation on your first day of
employment.

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In accordance with current federal law, you will be asked to provide
documentation proving your eligibility to work in the United States. Please
review the enclosed Employment Eligibility Verification Form (Form I9) and the
list of acceptable documents that are required. You must bring this on your
first day of employment. If you fail to bring proper documentation with you on
your first day of work, you will be asked to go home to collect your paperwork.
Unfortunately, there can be no exceptions. If you do not bring proper
documentation, you will be considered ineligible for employment and CMGI will
not add you to its payroll until the required I9 documentation is received.

Please confirm your acceptance of this position and your start date by signing
one copy of this letter and returning it to me. Additionally, please complete,
sign and return the enclosed Employee Information sheet along with the Sexual
Harassment policy, Massachusetts Tax Form, W4, Direct Deposit Form and both
agreements that are enclosed. All documents along with one copy of your signed
offer letter must be returned by the end of business on Thursday, if you wish to
start the following Monday.

If you choose to fax the documents, please fax a copy of your signed offer
letter and all the enclosed documents to 978/684-3816 and bring the originals
with you on your first day. If you wish to overnight the original documents,
please mail one copy of your signed offer letter and the entire enclosed package
to CMGI Attention: Joyce Fantasia 100 Brickstone Square Andover, MA 01810.

Your employment with CMGI will be "at-will". This means that your employment
with CMGI may be terminated by either you or CMGI at any time and for any
reason, with or without notice. This offer expires as of the close of business
on Friday, March 8, 2002. This offer supersedes all prior offers, both verbal
and written. This letter does not constitute a guarantee of employment or a
contract.

Thomas, we are very pleased by the prospect of your addition to the CMGI team,
and we are confident that you will make a significant contribution to our future
success!

Sincerely,

/s/ Jeffrey Yanagi

Jeff Yanagi
Executive Vice President
Human Resources

/s/ Thomas Oberdorf
-------------------
THOMAS OBERDORF

March 4, 2002
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START DATE<PAGE>

                                                                    EXHIBIT 10.5

                          EXECUTIVE SEVERANCE AGREEMENT

         THIS EXECUTIVE SEVERANCE AGREEMENT ("Agreement") by and between CMGI,
Inc., a Delaware corporation (the "Company") headquartered at 100 Brickstone
Square, Andover, Massachusetts and Thomas Oberdorf (the "Executive"), is made as
of March 4, 2002.

         WHEREAS, the Board of Directors of the Company (the "Board") has
determined that Executive will play a critical role in the operations of the
Company; and

         WHEREAS, the Board has determined that appropriate steps should be
taken to reinforce and encourage the continued employment and dedication of the
Executive.

         NOW, THEREFORE, as an inducement for and in consideration of the
Executive remaining in its employ, the Company agrees that the Executive shall
receive the severance benefits set forth in this Agreement in the event the
Executive's employment with the Company is terminated under the circumstances
described below.

1.       Not an Employment Contract. The Executive acknowledges that this
Agreement does not constitute a contract of employment or impose on the Company
any obligation to retain the Executive as an employee and that this Agreement
does not prevent the Executive from terminating his employment. Executive
understands and acknowledges that he is an employee at will and that either he
or the Company may terminate the employment relationship between them at any
time and for any reason.

2.       Severance Pay.

(a)      Severance Pay Following a Change in Control. In the event a Change in
Control (as defined below) occurs and, within one (1) year thereafter, the
employment of the Executive is terminated by the Company for a reason other than
for Cause (as defined below) or by the Executive for Good Reason (as defined
below), then the Company shall pay to the Executive (as severance pay) a lump
sum payment equal to (i) his then current base salary multiplied by two (2),
plus (ii) his then current target bonus multiplied by two (2), within 30 days
after the Termination Date (as defined below). The Executive agrees that after
the Termination Date, but prior to payment of the severance pay and bonus called
for by this paragraph, he shall execute a release, based on the Company's
standard form severance agreement, of any and all claims he may have against the
Company and its officers, employees, directors, parents and affiliates.
Executive understands and agrees that the payment of the severance pay and bonus
called for by this paragraph are contingent on his execution of the previously
described release of claims.

(b)      Severance Pay Absent a Change in Control. In the event the employment
of the Executive is terminated by the Company for a reason other than for Cause
(as defined below), then the Company shall continue to pay to the Executive (as
severance pay), (i) his regular base salary as in effect on the Executive's last
day of employment (exclusive of bonus or any other compensation), for one (1)
year following the Termination Date (as defined below), plus (ii) at the end of
such year, the amount of Executive's target bonus as in effect on the
Executive's last day of employment. Unless the parties agree otherwise, the
severance pay provided for in clause

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(i) above shall be paid in installments, in accordance with the Company's
regular payroll practices, and the severance pay set forth in (ii) above shall
be paid within 30 days of the end of the fiscal year to which such amount
relates. The Executive agrees that after the Termination Date, but prior to
payment of the severance pay and bonus called for by this paragraph, he shall
execute a release, based on the Company's standard form severance agreement, of
any and all claims he may have against the Company and its officers, employees,
directors, parents and affiliates. Executive understands and agrees that the
payment of the severance pay and bonus called for by this paragraph are
contingent on his execution of the previously described release of claims.

(c)      Sole Remedy. The payment to the Executive of the amounts payable under
this Section 2 shall constitute the sole remedy of the Executive in the event of
a termination of the Executive's employment by the Company or a resignation by
the Executive that results in payment of benefits under this Section 2.

3.       Definitions. For purposes of this Agreement, the following terms shall
have the following meanings:

(a)      "Cause" shall mean a good faith finding by the Company of: (i) gross
negligence or willful misconduct by Executive in connection with his employment
duties, (ii) failure by Executive to perform his duties or responsibilities
required pursuant to his employment, after written notice and an opportunity to
cure, (iii) mis-appropriation by Executive of the assets or business
opportunities of the Company, or its affiliates, (iv) embezzlement or other
financial fraud committed by Executive, (v) the Executive knowingly allowing any
third party to commit any of the acts described in any of the preceding clauses
(iii) or (iv), or (vi) the Executive's indictment for, conviction of, or entry
of a plea of no contest with respect to, any felony.

(b)      "Good Reason" shall mean: (i) the unilateral relocation by the Company
of the Executive's principal work place for the Company to a site more than 60
miles from Andover, Massachusetts; (ii) a reduction in the Executive's then
current base salary, without the Executive's consent; or (iii) the Executive's
assignment to a position where the duties of the position are outside his area
of professional competence.

(c)      "Change in Control" shall mean the consummation of any of the following
events: (i) a sale, lease or disposition of all or substantially all of the
assets of the Company, or (ii) a sale, merger, consolidation, reorganization,
recapitalization, sale of assets, stock purchase, contribution or other similar
transaction (in a single transaction or a series of related transactions) of the
Company with or into any other corporation or corporations or other entity, or
any other corporate reorganization, where the stockholders of the Company
immediately prior to such event do not retain (in substantially the same
percentages) beneficial ownership, directly or indirectly, of more than fifty
percent (50%) of the voting power of and interest in the successor entity or the
entity that controls the successor entity, provided, however, that no Change in
Control shall be deemed to have occurred due to the conversion or payment of any
equity or debt instrument of the Company which is outstanding on the date
hereof.

(d)      "Termination Date" shall mean the Executive's last day on the payroll
of the Company.

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4.       Miscellaneous.

(a)      Notices. Any notices delivered under this Agreement shall be deemed
duly delivered four business days after it is sent by registered or certified
mail, return receipt requested, postage prepaid, or one business day after it is
sent for next-business day delivery via a reputable nationwide overnight courier
service, in each case to the address of the recipient set forth in the
introductory paragraph hereto. Either party may change the address to which
notices are to be delivered by giving notice of such change to the other party.
All notices to the Company shall also be addressed to the Company's General
Counsel.

(b)      Pronouns. Whenever the context may require, any pronouns used in this
Agreement shall include the corresponding masculine, feminine or neuter forms,
and the singular forms of nouns and pronouns shall include the plural, and vice
versa.

(c)      Entire Agreement.  This Agreement constitutes the entire agreement
between the parties and supersedes all prior agreements and understandings,
whether written or oral, relating to the subject matter of this Agreement.

(d)      Amendment.  This Agreement may be amended or modified only by a written
instrument executed by both the Company and the Executive.

(e)      Governing Law.  This Agreement shall be governed by and construed in
accordance with the laws of the Commonwealth of Massachusetts. Any action, suit
or other legal arising under or relating to any provision of this Agreement
shall be commenced only in a court of the Commonwealth of Massachusetts (or, if
appropriate, a federal court located within Massachusetts), and the Company and
the Executive each consents to the jurisdiction of such a court. The Company and
the Executive each hereby irrevocably waive any right to a trial by jury in any
action, suit or other legal proceeding arising under or relating to any
provision of this Agreement.

(f)      Successors and Assigns. This Agreement shall be binding upon and inure
to the benefit of both parties and their respective successors and assigns,
including any corporation with which or into which the Company may be merged or
which may succeed to its assets or business, provided, however, that the
obligations of the Executive are personal and shall not be assigned by him.

(g)      Waivers. No delay or omission by the Company in exercising any right
under this Agreement shall operate as a waiver of that or any other right. A
waiver or consent given by the Company on any one occasion shall be effective
only in that instance and shall not be construed as a bar or waiver of any right
on any other occasion.

(h)      Captions. The captions of the sections of this Agreement are for
convenience of reference only and in no way define, limit or affect the scope or
substance of any section of this Agreement.

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(i)     Severability. In case any provision of this Agreement shall be invalid,
illegal or otherwise unenforceable, the validity, legality and enforceability of
the remaining provisions shall in no way be affected or impaired thereby.

        THE EXECUTIVE ACKNOWLEDGES THAT HE HAS CAREFULLY READ THIS AGREEMENT AND
UNDERSTANDS AND AGREES TO ALL OF THE PROVISIONS IN THIS AGREEMENT.

        IN WITNESS WHEREOF, the parties hereto have executed this Agreement as
of the day and year set forth above.

                                                      CMGI, Inc.

                                                      By: /s/ Jeffrey Yanagi
                                                          -------------------
                                                      Title: EVP Human Resources

                                                      /s/ Thomas Oberdorf
                                                      -------------------
                                                      Thomas Oberdorf

                                      -4-

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