Document:

<PAGE>

                                                                    Exhibit 10.1
                                 NAVISITE, INC.

                                  COMMON STOCK

                               PURCHASE AGREEMENT

                                  JUNE 8, 2000
<PAGE>

                                TABLE OF CONTENTS
                                -----------------
<TABLE>
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                                                                                                 Page
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1.  PURCHASE AND SALE OF STOCK......................................................................1

         (a)    Authorization.......................................................................1
         (b)    Purchase and Sale of Stock .........................................................1

2.  CLOSING.........................................................................................1

3.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY...................................................2

         (a)      Organization Good Standing and Qualification......................................2
         (b)      Capitalization....................................................................2
         (c)      Due Authorization.................................................................3
         (d)      SEC Reports; Financial Statements.................................................3
         (e)      Valid Issuance of Stock...........................................................4
                         (i)   Valid Issuance.......................................................4
                         (ii)  Compliance with Securities Laws......................................4
         (f)      Governmental Consents.............................................................4
         (g)      Non-Contravention.................................................................4
         (h)      Litigation........................................................................5
         (i)      Compliance with Law...............................................................5
         (j)      Absence of Certain Changes........................................................5
         (k)      Invention Assignment and Confidentiality Agreement................................5
         (l)      Intellectual Property.............................................................5
                         (i)   Ownership or Right to Use............................................5
                         (ii)  Licenses; Other Agreements...........................................5
                         (iii) No Infringement......................................................6
         (m)      Registration Rights...............................................................6
         (n)      Title to Property and Assets......................................................6
         (o)      Tax Matters.......................................................................6
         (p)      Environmental and Safety Laws.....................................................7
         (q)      ERISA.............................................................................7
         (r)      Employment Matters................................................................7
         (s)      Subsidiaries......................................................................7
         (t)      Brokers and Finders...............................................................7

4.  REPRESENTATIONS, WARRANTIES AND CERTAIN
         AGREEMENTS OF THE INVESTOR.................................................................8

         (a)      Organization, Good Standing and Qualification.....................................8
</TABLE>
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<TABLE>
<S>               <C>                                                                              <C>
         (b)      Due Authorization.................................................................8
         (c)      Governmental Consents.............................................................8
         (d)      Non-Contravention.................................................................8
         (e)      Purchase for Own Account..........................................................8
         (f)      Investment Experience.............................................................9
         (g)      Accredited Investor Status .......................................................9
         (h)      Restricted Securities.............................................................9
         (i)      Legends...........................................................................9

5.       INDEMNIFICATION...........................................................................10

         (a)      Agreement to Indemnify...........................................................10
                         (i)   Company Indemnity...................................................10
                         (ii)  Investor Indemnity..................................................10
                         (iii) Equitable Relief....................................................10
                         (iv)  Remedies Exclusive..................................................10
         (b)      Survival.........................................................................10
         (c)      Claims for Indemnification.......................................................11
         (d)      Defense of Claims................................................................11
         (e)      Certain Definitions..............................................................12

6.  MISCELLANEOUS..................................................................................13

         (a)      Specific Performance.............................................................13
         b.       Transferability of Shares........................................................13
         (c)      Use of Proceeds..................................................................13
         (d)      Filing of Reports................................................................13
         (e)      Successors and Assigns...........................................................13
         (f)      Governing Law....................................................................13
         (g)      Counterparts.....................................................................13
         (h)      Headings.........................................................................14
         (i)      Notices..........................................................................14
         (j)      Amendments and Waivers...........................................................14
         (k)      Severability.....................................................................14
         (l)      Entire Agreement.................................................................14
         (m)      Further Assurances...............................................................14
         (n)      Construction.....................................................................14
         (o)      Fees, Costs and Expenses.........................................................15
         (p)      Dispute Resolution...............................................................15
         (q)      Index of Defined Terms...........................................................15

EXHIBIT A.........................................................................................A-1
EXHIBIT B.........................................................................................B-1
</TABLE>
                                      ii
<PAGE>

                                  COMMON STOCK
                               PURCHASE AGREEMENT

This Common Stock Purchase Agreement (this "Agreement") is made and entered into
                                            ---------
as of June 8, 2000 by and between NaviSite, Inc., a Delaware corporation (the
"Company"), and CMGI, Inc., a Delaware corporation (the "Investor").
                                                         --------

WHEREAS, the Company desires to sell to the Investor, and the Investor desires
to purchase from the Company, $50,000,000 worth of shares (determined as set
forth in Section 1(b), the "Purchased Shares") of the Company's common stock,
                            ----------------
par value $0.01 per share (the "Common Stock"); and
                                ------------

WHEREAS, simultaneously with execution of, and as an inducement for the Investor
to enter into, this Agreement, the Company and the Investor are entering into an
amendment of the Investor Rights Agreement, dated as of October 27, 1999 (the
"Investor Rights Agreement"), by and between the Company and the Investor to
 -------------------------
provide that the Purchased Shares are "Registrable Shares" within the meaning
thereof substantially in the form of Exhibit A hereto (the "Amendment");
                                                            ---------

NOW THEREFORE, in consideration of the foregoing recitals and the
representations, warranties, covenants and agreements set forth herein and other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

1.       PURCHASE AND SALE OF STOCK.
         --------------------------

                  (a) Authorization. The Company's Board of Directors (the
                      -------------
"Board") has authorized the issuance, pursuant to the terms and conditions of
this Agreement, of the Purchased Shares.

                  (b) Purchase and Sale of Stock. Simultaneously with the
                      --------------------------
execution and delivery of this Agreement at the Closing (as defined in Section
2), the Investor is delivering to the Company $50,000,000 (the "Purchase Price")
                                                                --------------
against delivery to the Investor by the Company on June 13, 2000 of a
certificate or certificates representing the number of shares of Common Stock
equal to $50,000,000 divided by the average of the closing prices per share of
Common Stock as reported on the Nasdaq National Market System on June 6, 7, 8, 9
and 12, 2000, rounded up to the nearest whole share.

2.       CLOSING. The closing of the purchase and sale of the Purchased Shares
         -------
(the "Closing") is taking place simultaneous with execution hereof at the
offices of Skadden, Arps, Slate, Meagher & Flom LLP, One Beacon Street, Boston,
Massachusetts at 10:00 a.m., Boston time (which date and time are referred to in
this Agreement as the "Closing Date"). At the Closing, (a) the Investor is
                       ------------
delivering the Purchase Price to the Company by wire transfer of immediately
<PAGE>

available funds against delivery by the Company to the Investor on June 13, 2000
of a certificate representing the Purchased Shares (and the Company hereby
agrees to deliver such certificate on such date), (b) the Company and the
Investor are entering into the Amendment and (c) Hale and Dorr LLP, counsel to
Company, is committing in writing to deliver an opinion substantially in the
form set forth as Exhibit B hereto not later than June 13, 2000.
                  ---------

3.       REPRESENTATIONS AND WARRANTIES OF THE COMPANY.  The Company
         ---------------------------------------------
hereby represents and warrants to the Investor, as of the date hereof, that,
except as set forth in the Disclosure Letter from the Company to the Investor
dated as of the date of this Agreement (the "Disclosure Letter"):
                                             -----------------

                  (a) Organization, Good Standing and Qualification. The Company
                      ---------------------------------------------
is a corporation duly organized, validly existing and in good standing under the
laws of the State of Delaware and has all corporate power and authority required
to (i) carry on its business as currently conducted and as proposed to be
conducted by the Company in its Company Reports (as hereinafter defined) and
(ii) enter into this Agreement and the Amendment and consummate the transactions
contemplated hereby. Each of the Company and its subsidiaries is qualified to do
business and is in good standing in each jurisdiction in which the failure to so
qualify would have a Material Adverse Effect on the Company. As used in this
Agreement, "Material Adverse Effect" means a material adverse effect on, or a
            -----------------------
material adverse change in, or a group of such effects on or changes in, the
business, financial condition, results of operations, assets or liabilities of
the applicable party and its subsidiaries, taken as a whole.

                  (b) Capitalization. The authorized capital stock of the
                      --------------
Company consists of: (i) 300,000,000 shares of Common Stock, of which 56,485,988
shares were issued and outstanding as of 12:00 p.m. on June 7, 2000; and (ii)
5,000,000 shares of preferred stock, par value $0.01 per share (the "Preferred
                                                                     ---------
Stock"), of which none are issued and outstanding. All of such shares of capital
-----
stock have been duly authorized for issuance, and all of such shares which are
issued and outstanding have been validly issued and are fully paid,
nonassessable and free of any liens or encumbrances other than any liens or
encumbrances created by or imposed upon the holders thereof. The Company has
reserved (i)10,663,691 shares of Common Stock for issuance to officers,
directors, employees, consultants or Affiliates (as defined in Section 5(e)(i))
of the Company under the Company's 1998 Equity Incentive Plan, of which
8,107,246 are subject to outstanding options granted thereunder; (ii) 650,000
shares of Common Stock for issuance to non-employee directors of the Company
under the Company's 1999 Director Stock Option Plan, of which 75,000 are subject
to outstanding options granted thereunder; and (iii) 100,000 shares of Common
Stock for issuance under the Company's Employee Stock Purchase Plan, of which
62,719 are issued and outstanding. All shares of Common Stock subject to
issuance as aforesaid, upon issuance on the terms and conditions specified in
the instruments pursuant to which they are issuable, are duly authorized and
will be validly issued, fully paid and nonassessable. There are no other equity
securities, options, warrants, calls, rights, commitments or agreements of any
character to which the Company is a party or by which it is bound obligating the
Company to issue, deliver, sell, repurchase or redeem, or cause to be issued,
delivered, sold, repurchased or

                                       2
<PAGE>

redeemed, any shares of the capital stock of the Company or obligating the
Company to grant, extend or enter into any such equity security, option,
warrant, call, right, commitment or agreement. To the best knowledge of the
Company, there are no shareholder agreements, voting agreements or voting trusts
relating to any shares of capital stock of the Company.

                  (c) Due Authorization. All corporate action on the part of the
                      -----------------
Company necessary for the authorization, execution and delivery of, and the
performance of all obligations of the Company under, this Agreement and the
Amendment has been taken, and this Agreement and the Amendment constitute valid
and legally binding obligations of the Company, enforceable against the Company
in accordance with their terms, except (i) as may be limited by (A) applicable
bankruptcy, insolvency, reorganization or others laws of general application
relating to or affecting the enforcement of creditors' rights generally and (B)
the effects of rules of law governing the availability of equitable remedies and
(ii) as rights to indemnity or contribution may be limited under federal or
state securities laws or by principles of public policy thereunder.

                  (d) SEC Reports; Financial Statements. The Company has
                      ---------------------------------
previously furnished or made available to the Investor its (i) Quarterly Reports
on Form 10-Q for the quarters ended October 31, 1999 and January 31, 2000 filed
by the Company with the Securities and Exchange Commission (the "SEC") and (ii)
                                                                 ---
all other periodic and current reports filed by the Company with the SEC under
the Securities Act of 1933, as amended (the "Securities Act") or the Securities
                                             --------------
Exchange Act of 1934, as amended (the "Exchange Act"), since October 21, 1999,
                                       ------------
in each case, as amended through the date hereof (collectively, the "Company
                                                                     -------
Reports"). As of their respective dates the Company Reports (or, if any of the
-------
Company Reports shall have been amended, as of the date of such amendment),
complied in all material respects with applicable requirements of the Securities
Act or the Exchange Act and did not contain any untrue statement of a material
fact or omit to state a material fact required to be stated therein or necessary
to make the statements therein, in light of the circumstances under which such
statements were made, not misleading. The Company has timely filed with the SEC,
and the Company Reports constitute, all reports required to be filed under
Sections 13, 14 or 15(d) of the Exchange Act since October 21, 1999. The audited
financial statements and unaudited interim financial statements of the Company
included in the Company Reports (i) comply as to form in all material respects
with the published rules and regulations of the SEC with respect thereto, (ii)
have been prepared in accordance with generally accepted accounting principles
applied on a consistent basis throughout the periods covered thereby (except as
may be indicated therein or in the notes thereto, and in the case of quarterly
financial statements, as permitted by Form 10-Q under the Exchange Act), (iii)
fairly present the consolidated financial condition, results of operations and
cash flows of the Company as of the respective dates thereof and for the periods
referred to therein, and (iv) are consistent with the books and records of the
Company.

                                       3
<PAGE>

                  (e)      Valid Issuance of Stock.
                           -----------------------

                           (i)      Valid Issuance.  The Purchased Shares, when
                                    --------------
issued, sold and delivered in accordance with the terms of this Agreement, will
be duly and validly issued, fully paid, nonassessable and free of preemptive
rights binding on the Company.

                           (ii)     Compliance with Securities Laws.
                                    -------------------------------
Assuming the correctness of the representations made by the Investor in Section
4, no change in applicable law and no unlawful distribution of the Purchased
Shares by the Investor or other Persons, the Purchased Shares will be issued to
the Investor in compliance with applicable exemptions from (A) the registration
and prospectus delivery requirements of the Securities Act and (B) the
registration and qualification requirements of all applicable securities laws of
the states of the United States. As used in this Agreement, "Person" shall mean
                                                             ------
any individual, partnership, corporation, limited liability company, joint
venture, association, joint-stock company, trust, unincorporated organization or
government or any agency or political Subdivision thereof.

                  (f)      Governmental Consents. No consent, approval, order or
                           ---------------------
authorization of, or registration qualification, designation, declaration or
filing with, any federal, state or local governmental authority on the part of
the Company or any of its subsidiaries is required in connection with the
consummation of the transactions contemplated by this Agreement, except (i) as
may be required under the Securities Act and the rules and regulations
thereunder and all applicable state securities laws in connection with the
transactions contemplated by this Agreement and (ii) for such consents,
approvals, orders, authorizations, qualifications, designations, declarations or
filings the failure of which to obtain or make, individually or in the
aggregate, would not have a Material Adverse Effect on the Company. All such
consents, approvals, orders, authorizations and qualifications will be effective
and all such designations, declarations and filings will be made within the time
prescribed by law.

                  (g)      Non-Contravention. The execution, delivery and
                           -----------------
performance of this Agreement and the Amendment by the Company, and the
consummation by the Company of the transactions contemplated hereby or thereby,
do not: (i) contravene or conflict with the Company's Certificate of
Incorporation, as amended (the "Certificate"), or the Company's By-Laws; (ii)
                                -----------
constitute a violation of any provision of any federal, state, local or foreign
law or rule, regulation or requirement binding upon or applicable to the Company
or any of its subsidiaries; or (iii) constitute a default or require any consent
under, give rise to any right of termination, cancellation or acceleration of,
or to a loss of any benefit to which the Company or any of its subsidiaries is
entitled under, or result in the creation or imposition of any lien, claim or
encumbrance on any assets of the Company or any such subsidiary under, any
contract to which the Company or such subsidiary is a party or any permit,
license or similar right relating to the Company or such subsidiary or by which
the Company or such subsidiary may be bound or affected, except any such
default, consent, right of termination, cancellation or acceleration, loss or
lien, claim or encumbrance which, individually or in the aggregate, would not
have a Material Adverse Effect on the Company.

                                       4
<PAGE>

                  Litigation. Except as disclosed in the Company Reports, there
                  -----------
is no action, suit, proceeding, claim, arbitration or investigation (each, an
"Action") pending or, to the Company's best knowledge, threatened: (i) against
the Company or any of its subsidiaries, or any of their respective activities,
properties or assets, or any officer, director or employee of the Company or any
of its subsidiaries in connection with such officer's, director's or employee's
relationship with, or actions taken on behalf of, the Company or such
subsidiary; or (ii) against the Company or any of its subsidiaries, or any of
their respective activities, properties or assets, or any officer, director or
employee of the Company or any of its subsidiaries that seeks to prevent,
enjoin, alter or delay any of the transactions contemplated by this Agreement.

                  (h) Compliance with Law.  Each of the Company and its
                      -------------------
subsidiaries is in material compliance with all applicable statutes, laws,
regulations and executive orders.

                  (i) Absence of Certain Changes. Since January 31, 2000, the
                      --------------------------
businesses and operations of the Company and each of its subsidiaries have been
conducted in the ordinary course consistent with past practice and there has not
been or occurred any event or condition which, individually or in the aggregate,
would have a Material Adverse Effect on the Company.

                  (j) Invention Assignment and Confidentiality Agreement. Each
                      --------------------------------------------------
employee and consultant or independent contractor of the Company or any of its
subsidiaries whose material duties include the development of products or
Intellectual Property (as defined below), and each former employee and
consultant or independent contractor whose material duties included the
development of products or Intellectual Property, has entered into and executed
an invention assignment and confidentiality agreement or an employment or
consulting agreement containing terms with respect to invention assignments and
confidentiality.

                  (k) Intellectual Property.
                      ---------------------

                      (i)      Ownership or Right to Use.  The Company or
                               -------------------------
one of its subsidiaries has sole title to and owns, or is licensed or otherwise
possesses legally enforceable rights to use, or reasonably expects that it will
be able to obtain licenses or legally enforceable rights to use, all patents or
patent applications, software, know-how, registered or unregistered trademarks
and service marks and any applications therefor, registered or unregistered
copyrights and trade names and any applications therefor, trade secrets or
other confidential or proprietary information ("Intellectual Property")
                                                ---------------------
necessary to enable the Company and its subsidiaries to carry on their
respective businesses as currently conducted or as proposed to be conducted
except where the failure to own or have rights to use such Intellectual Property
would not have a Material Adverse Effect on the Company or except as disclosed
in the Company Reports.

                       (ii)     Licenses; Other Agreements.  Neither the
                                --------------------------
Company nor any of its subsidiaries is currently subject (whether as licensor or
licensee) to any exclusive licenses (whether such exclusivity is temporary or
permanent) to any material portion of the Intellectual Property utilized by the
Company or any of its subsidiaries. There are not outstanding any
<PAGE>

licenses or agreements of any kind relating to the license by the Company of any
Intellectual Property owned by the Company or any of its subsidiaries, except
for agreements with customers of the Company or any such subsidiary entered into
in the ordinary course of business. Neither the Company nor any of its
subsidiaries is obligated to pay any royalties or other payments to third
parties with respect to the marketing, sale, distribution, manufacture, license
or use of any Intellectual Property (other than off-the-shelf commercial applica
tions), except as it may be so obligated in the ordinary course of its business.

                           (iii)    No Infringement.  Neither the Company nor
                                    ---------------
any of its subsidiaries is violating or infringing, and neither the Company nor
any of its subsidiaries has received any communication alleging that either the
Company, any of its subsidiaries or any of their respective employees or
consultants has violated or infringed, any Intellectual Property of any other
Person which would reasonably be expected to have a Material Adverse Effect on
the Company.

                  (l) Registration Rights. Except as provided in the Investor
                      -------------------
Rights Agreement, the Company has not granted or agreed to grant to any Person
any rights (including piggyback registration rights), to have any securities of
the Company registered with the SEC or registered or qualified with any other
governmental authority.

                  (m) Title to Property and Assets. The properties and assets
                      ----------------------------
owned by the Company and each of its subsidiaries are owned by the Company or
such subsidiary free and clear of all mortgages, deeds of trust, liens, charges,
encumbrances and security interests, except for statutory liens for the payment
of current taxes that are not yet delinquent and liens, encumbrances and
security interests that arise in the ordinary course of business and do not have
a Material Adverse Effect on the Company and its subsidiaries, taken as a whole.
With respect to the property and assets it leases, each of the Company and its
subsidiaries is in compliance with such leases in all material respects.

                  (n) Tax Matters.
                      -----------

                      (i)      There have been no examinations or audits of
any of the Company's tax returns or reports by any federal, state or local
governmental agency having jurisdiction over the Company. The Company and its
subsidiaries have filed all federal, state, county and local tax returns
required to have been filed by them and paid, or made provision for, all taxes
shown to be due on such returns except such taxes which are being contested in
good faith by the Company. There are in effect no waivers of applicable statutes
of limitations with respect to taxes for any year.

                      (ii)     The Company has not elected pursuant to the
Internal Revenue Code of 1986, as amended (the "Code"), to be treated as a
                                                ----
collapsible corporation pursuant to Section 1362(a) or Section 341(f) of the
Code, respectively, nor has it made any other elections pursuant to the Code
(other than elections which relate solely to matters of accounting,
<PAGE>

depreciation or amortization) which would reasonably be expected to have a
Material Adverse Effect on the Company.

                  (o) Environmental and Safety Laws. The Company is not in
                      -----------------------------
violation of any applicable statute, law or regulation relating to the
environment or occupational health and safety which would reasonably be expected
to have a Material Adverse Effect on the Company.

                  (p) ERISA. The Company does not sponsor or participate in any
                      -----
employee benefit plan subject to the Employee Retirement Income Security Act of
1974, as amended ("ERISA"). The Company is not required to contribute to any
                   -----
"multiemployer plan" as defined in ERISA Section 3(37), nor has the Company ever
contributed to or withdrawn from such a multiemployer plan.

                  (q) Employment Matters. The Company (i) has withheld all
                      ------------------
amounts required by law or agreement to be withheld from wages, salaries and
other payments to its employees and former employees or has remedied any failure
to do so, (ii) is not liable for any arrearages of wages and (iii) is not liable
for taxes or penalties for failure to withhold or pay wages when due. There are
no complaints pending or, to the Company's knowledge, threatened before any
governmental authority alleging unfair labor practices or unlawful
discrimination nor, to the Company's knowledge, is there any basis for any such
claim. There are no existing or, to the Company's knowledge, threatened labor
strikes, disputes, grievances, controversies or other labor troubles affecting
the Company which would individually or in the aggregate, have a Material
Adverse Effect on the Company. The Company is not a party to any collective
bargaining agreement with any labor union.

                  (r) Subsidiaries. Section 3(s) of the Disclosure Letter sets
                      ------------
forth all other Persons in which the Company (i) presently owns or controls,
directly or indirectly, more than a one percent interest or (ii) has the right
or option to acquire more than a one percent interest.

                  (s) Brokers and Finders. The Company has not incurred any
                      -------------------
obligation or liability, contingent or otherwise, for brokerage or finders' fees
or agents' commissions or other similar payment in connection with this
Agreement or any of the transactions contemplated hereby.

4.       REPRESENTATIONS, WARRANTIES AND CERTAIN AGREEMENTS OF THE
         ---------------------------------------------------------
INVESTOR.  The Investor hereby represents and warrants to the Company, as of
--------
the date hereof, and agrees that:

                  (a) Organization, Good Standing and Qualification. The
                      ---------------------------------------------
Investor is a corporation duly organized, validly existing and in good standing
under the laws of the State of Delaware and has all requisite corporate power
and authority required to (i) carry on its business as presently conducted and
(ii) enter into this Agreement and consummate the transactions contemplated
hereby.

                                       7
<PAGE>

                  (b) Due Authorization.  This Agreement and the Amendment
                      -----------------
has been duly authorized by all necessary corporate action on the part of the
Investor. This Agreement and the Amendment constitutes a valid and legally
binding obligation of the Investor, enforceable against the Investor in
accordance with their terms, except (i) as may be limited by (A) applicable
bankruptcy, insolvency, reorganization or other laws of general application
relating to or affecting the enforcement of creditors' rights generally and (B)
the effects of rules of law governing the availability of equitable remedies and
(ii) as rights to indemnity or contribution may be limited under federal or
state securities laws or by principles of public policy thereunder.

                  (c) Governmental Consents. No consent, approval, order or
                      ---------------------
authorization of, or registration qualification, designation, declaration or
filing with, any federal, state or local governmental authority on the part of
the Investor is required in connection with the consummation of the transactions
contemplated by this Agreement and the Amendment. All such consents, approvals,
orders, authorizations and qualifications and all such designations,
declarations and filings will be made within the time prescribed by law.

                  (d) Non-Contravention. The execution, delivery and performance
                      -----------------
of this Agreement and the Amendment by the Investor, and the consummation by the
Investor of the transactions contemplated hereby, do not: (i) contravene or
conflict with the Investor's Certificate of Incorporation, as amended, or the
Investor's By-Laws, as amended; (ii) constitute a violation of any provision of
any federal, state, local or foreign law binding upon or applicable to the
Investor; or (iii) constitute a default or require any consent under, give rise
to any right of termination, cancellation or acceleration of, or to a loss of
any benefit to which the Investor is entitled under, or result in the creation
or imposition of any lien, claim or encumbrance on any assets of the Investor
under, any contract to which the Investor is a party or any permit, license or
similar right relating to the Investor or by which the Investor may be bound or
affected, except any such default, consent, right of termination, cancellation
or acceleration, loss or lien, claim or encumbrance which, individually or in
the aggregate, would not have a Material Adverse Effect on the Investor.

                  (e) Purchase for Own Account. The Purchased Shares are being
                      ------------------------
acquired for investment for the Investor's own account, not as a nominee or
agent, and not with a view to the public resale or distribution thereof within
the meaning of the Securities Act, and the Investor has no present intention of
selling, granting any participation in or otherwise distributing the same. The
Investor has not been formed for the specific purpose of acquiring the Purchased
Shares.

                  (f) Investment Experience. The Investor understands that the
                      ---------------------
purchase of the Purchased Shares involves substantial risk. The Investor has
experience as an investor in securities of companies and acknowledges that it is
able to fend for itself, can bear the economic risk of its investment in the
Purchased Shares and has such knowledge and experience in financial or business
matters that it is capable of evaluating the merits and risks of its investment
in the Purchased Shares and protecting its own interests in connection with this
investment.

                                       8
<PAGE>

                  (g) Accredited Investor Status.  The Investor is an
                      --------------------------
"accredited investor" within the meaning of Regulation D promulgated under the
Securities Act.

                  (h) Restricted Securities. The Investor understands that (i)
                      ---------------------
the Purchased Shares are characterized as "restricted securities" under the
Securities Act, inasmuch as they are being acquired from the Company in a
transaction not involving a public offering and (ii) under the Securities Act
and applicable rules and regulations thereunder, such securities may be resold
without registration under the Securities Act only in certain limited
circumstances. The Investor is familiar with Rule 144 of the SEC under the
Securities Act, as presently in effect, and understands the resale limitations
imposed thereby and by the Securities Act.

                  (i) Legends.  The Investor agrees that the certificates
                      -------
for the Purchased Shares will bear the following legend:

                  "The shares represented by this certificate have not been
                  registered under the Securities Act of 1933, as amended, or
                  with any state securities commission, and may not be
                  transferred or disposed of by the holder in the absence of a
                  registration statement which is effective under the Securities
                  Act of 1933, as amended, and applicable state laws and rules
                  or unless such transfer may be effected without violation of
                  the Securities Act of 1933, as amended, and other applicable
                  state laws and rules."

In addition, the Investor agrees that the Company may place stop transfer orders
with its transfer agents with respect to such certificates. The legend set forth
above shall be removed by the Company from any certificate evidencing the
Purchased Shares upon delivery to the Company of an opinion by counsel,
reasonably satisfactory to the Company, that a registration statement under the
Securities Act is at that time in effect with respect to the legended security
or that such security can be freely transferred in a public sale without such a
registration statement being in effect and that such transfer will not
jeopardize the exemption or exemptions from registration pursuant to which the
Company issued the Purchased Shares.

5.       INDEMNIFICATION.
         ---------------
                  (a)      Agreement to Indemnify.
                           ----------------------

                           (i)      Company Indemnity.  The Investor, its
                                    -----------------
Affiliates and Associates (each as defined in Section 5(e)), and each officer,
director, stockholder, employer, representative and agent of any of the
foregoing (collectively, the "Investor Indemnitees"), shall each be indemnified
                              --------------------
by the Company and held harmless to the extent set forth in this Section 5 with
respect to any and all Damages (as defined in Section 5(e)) incurred by any
Investor Indemnitee as a proximate result of any inaccuracy or misrepresentation
in, or breach of, any representation, warranty, covenant or agreement made by
the Company in this Agreement (including any

                                       9
<PAGE>

exhibits, schedules or disclosure letters hereto). This Section 5 does not
provide for indemnification for claims arising from the registration of the
Purchased Shares under federal and state securities laws.

                           (ii)     Investor Indemnity.  The Company, its
                                    ------------------
respective Affiliates and Associates, and each officer, director, stockholder,
employer, representative and agent of any of the foregoing (collectively, the
"Company Indemnitees"), shall each be indemnified and held harmless to the
 -------------------
extent set forth in this Section 5 by the Investor in respect of any and all
Damages incurred by any Company Indemnitee as a proximate result of any
inaccuracy or misrepresentation in, or breach of, any representation, warranty,
covenant or agreement made by the Investor in this Agreement. This Section 5
does not provide for indemnification for claims arising from the registration of
Purchased Shares under federal and state securities laws.

                           (iii)    Equitable Relief. Nothing set forth in this
                                    ----------------
Section 5 shall be deemed to prohibit or limit the right of any Investor
Indemnitee or Company Indemnitee (an "Indemnitee") at any time before, on or
                                      ----------
after the Closing, to seek injunctive or other equitable relief for the failure
of any "Indemnifying Party" (which, for purposes hereof, in the case of an
        ------------------
Investor Indemnitee, means the Company and, in the case of a Company Indemnitee,
means the Investor) to perform or comply with any covenant or agreement
contained herein.

                           (iv)     Remedies Exclusive. The rights and remedies
                                    ------------------
provided in this Section 5 shall be the exclusive rights and remedies of the
parties hereto after the Closing in connection with the transactions
contemplated by this Agreement, except in the case of fraud, in which case, the
defrauded party shall have all rights and remedies provided hereunder and by
law.

                  (b) Survival. All representations and warranties of the
                      --------
Investor and the Company contained herein and all claims of any Indemnitee in
respect of any inaccuracy or misrepresentation or breach, shall survive the
Closing until the first anniversary of the Closing Date, regardless of whether
the applicable statute of limitations, including extensions thereof, may expire;
provided, however, notwith standing the foregoing, the representations and
--------  -------
warranties of the Company contained in Section 3(e) shall survive the Closing
until such time as the applicable statute of limitations expires. All covenants
and agreements of the Investor and the Company contained in this Agreement shall
survive the Closing in perpetuity (except to the extent any such covenant or
agreement shall terminate or expire by its terms). All claims of any Indemnitee
in respect of any breach of such covenants or agreements shall survive the
Closing until the expiration of one year following the non-breaching party's
obtaining actual knowledge of such breach; provided that the covenant or
agreement has not terminated or expired by its terms prior to the date the claim
is made.

                  (c) Claims for Indemnification.  If any Indemnitee shall
                      --------------------------
believe that such Indemnitee is entitled to indemnification pursuant to this
Section 5 in respect of any Damages, such Indemnitee shall give the appropriate
Indemnifying Party prompt written notice thereof.

                                      10
<PAGE>

Any such notice shall set forth in reasonable detail and to the extent then
known the basis for such claim for indemnification. The failure of such
Indemnitee to give notice of any claim for indemnification promptly shall not
adversely affect such Indemnitee's right to indemnity hereunder except to the
extent that such failure adversely affects the right of the Indemnifying Party
to assert any reasonable defense to such claim. Each such claim for indemnity
shall expressly state that the Indemnifying Party shall have only the 20-
business-day period referred to in the next sentence to dispute or deny such
claim. The Indemnifying Party shall have 20 business days following its receipt
of such notice either (i) to acquiesce in such claim by giving such Indemnitee
written notice of such acquiescence or (ii) to object to the claim by giving
such Indemnitee written notice of the objection. If the Indemnifying Party does
not object thereto within such 20- business-day period, such Indemnitee shall be
entitled to be indemnified for all Damages reasonably and proximately incurred
by such Indemnitee in respect of such claim. If the Indemnifying Party objects
to such claim in a timely manner, the senior management of the Company and the
Investor shall meet to attempt to resolve such dispute. If the dispute cannot be
resolved by senior management of the Company and Investor, either party may make
a written demand for formal dispute resolution and specify therein the scope of
the dispute. Within 30 days after such written notification, the parties agree
to meet for one day with an impartial mediator and consider dispute resolution
alternatives other than litigation. If an alternative method of dispute
resolution is not agreed upon within 30 days after the one- day mediation,
either party may begin litigation proceedings. Nothing in this Section 5(c)
shall be deemed to require arbitration.

                  (d) Defense of Claims. In connection with any claim that may
                      -----------------
give rise to indemnity under this Section 5 resulting from or arising out of any
claim or Proceeding (as defined in Section 5(e) below) against an Indemnitee by
a Person that is not a party hereto, the Indemnifying Party may (unless such
Indemnitee elects not to seek indemnity hereunder for such claim) but shall not
be obligated to, upon written notice to the relevant Indemnitee, assume the
defense of any such claim or Proceeding if the Indemnifying Party with respect
to such claim or Proceeding acknowledges (which acknowledgment may be subject
to the Indemnifying Party's right to object to such claims pursuant to Section
5(c)) to the Indemnitee the Indemnitee's right to indemnity pursuant hereto to
the extent provided herein (as such claim may have been modified through written
agreement of the parties) and provides assurances, reasonably satisfactory to
such Indemnitee, that the Indemnifying Party is financially able to assume the
defense of such claim to the extent provided herein if such claim or Proceeding
is decided adversely; provided, however, that nothing set forth herein shall be
                      --------  -------
deemed to require the Indemnifying Party to waive any cross-claims or
counterclaims for Damages the Indemnifying Party may have against the
Indemnitee. The Indemnitee shall be entitled to retain one separate counsel,
reasonably acceptable to the Indemnifying Party, if the Indemnitee shall
determine, upon the written advice of counsel, that, based on applicable ethical
standards, an actual or potential conflict of interest exists between the
Indemnifying Party and the Indemnitee in connection with such Proceeding. The
Indemnifying Party shall be obligated to pay the reasonable fees and expenses of
such separate counsel to the extent the Indemnitee is entitled to
indemnification by the Indemnifying Party with respect to such claim or
Proceeding under this Section 5(d). If the Indemnifying Party

                                      11
<PAGE>

assumes the defense of any such claim or Proceeding, the Indemnifying Party
shall select counsel reasonably acceptable to such Indemnitee to conduct the
defense of such claim or Proceeding, shall take all steps necessary in the
defense or settlement thereof and shall at all times diligently and promptly
pursue the resolution thereof. If the Indemnifying Party shall have assumed the
defense of any claim or Proceeding in accordance with this Section 5(d), the
Indemnifying Party shall be authorized to consent to a settlement of, or the
entry of any judgment arising from, any such claim or Proceeding; provided,
                                                                  --------
however, that the Indemnifying Party shall pay or cause to be paid all amounts
-------
arising out of such settlement or judgment concurrently with the effectiveness
thereof; provided further, that the Indemnifying Party shall not be authorized
         -------- -------
to encumber any of the assets of any Indemnitee or to agree to any restriction
that would apply to any Indemnitee or to its conduct of business without the
prior written consent of the Indemnitee; and provided further, that a condition
                                             -------- -------
to any such settlement shall be a complete release of such Indemnitee and its
directors, officers and employees with respect to such claim, including any
reasonably foresee able collateral consequences thereof. Such Indemnitee shall
be entitled to participate in (but not control) the defense of any such Action,
with its own counsel and at its own expense. Each Indemnitee shall, and shall
cause each of its Affiliates, directors, officers, employees and agents to,
cooperate fully with the Indemnifying Party in the defense of any claim or
Proceeding being defended by the Indemnifying Party pursuant to this Section
5(d). If the Indemnifying Party does not assume the defense of any claim or
Proceeding resulting therefrom in accordance with the terms of this Section
5(d), such Indemnitee may defend against such claim or Proceeding in such manner
as it may deem appropriate, including settling such claim or Proceeding after
giving notice of the same to the Indemnifying Party, on such terms as such
Indemnitee may deem appropriate. If any Indemnifying Party seeks to question the
manner in which such Indemnitee defended such claim or Proceeding or the amount
or nature of any such settlement, such Indemnifying Party shall have the burden
to prove by a preponderance of the evidence that such Indemnitee did not defend
such claim or Proceeding in a reasonably prudent manner.

                  (e) Certain Definitions. As used in this Section 5, or any
                      -------------------
other Section where such definition is expressly referenced: (i) "Affiliate"
                                                                  ---------
means, with respect to any Person, any Person directly or indirectly
controlling, controlled by or under direct or indirect common control with such
other Person; (ii) "Associate" means, when used to indicate a relationship with
                    ---------
any Person, (A) any other Person of which such first Person is an officer,
director or partner or is, directly or indirectly, the beneficial owner of 10%
or more of any class of equity securities, membership interests or other
comparable ownership interests issued by such other Person, (B) any trust or
other estate in which such first Person has a 10% or more beneficial interest or
as to which such first Person serves as trustee or in a similar fiduciary
capacity, and (C) if such first Person is an individual, any relative or spouse
of such first Person who has the same home as such first Person or who is a
director or officer of such first Person; (iii) "Damages" means all demands,
                                                 -------
claims, actions or causes of action, assessments, losses, damages, costs,
expenses, liabilities, judgments, awards, fines, response costs, sanctions,
taxes, penalties, charges and amounts paid in settlement, including reasonable
out-of-pocket costs, fees and expenses (including reasonable costs, fees and
expenses of attorneys, accountants and other agents of, or

                                      12
<PAGE>

other parties retained by, such party); and (iv) "Proceeding" means any action,
                                                  ----------
suit, hearing, arbitration, audit, proceeding (public or private) or
investigation that is brought or initiated by or against any federal, state,
local or foreign governmental authority or any other Person.

6.       MISCELLANEOUS.
         -------------

                  (a)      Specific Performance. In addition to any and all
                           --------------------
other remedies that may be available at law, in the event of any breach of this
Agreement, Purchaser shall be entitled to specific performance of the agreements
and obligations of the Company hereunder (including, without limitation, the
agreements and obligations of the Company under Section 2) and to other such
injunctive or other equitable relief as may be granted by a court of competent
jurisdiction.

                  (b)      Transferability of Shares.  Except as prohibited by
                           -------------------------
law, the Investor may sell or otherwise transfer any of the Purchased Shares to
any other Person.

                  (c)      Use of Proceeds.  The Company will use the proceeds
                           ---------------
from its issuance and sale to the Investor of the Purchased Shares for general
corporate purposes.

                  (d)      Filing of Reports. The Company will, for so long, as
                           -----------------
it has securities registered pursuant to Section 12 of the Exchange Act or has
securities registered pursuant to the Securities Act, make timely filing of such
reports as are required to be filed by it with the SEC.

                  (e)      Successors and Assigns.  The terms and conditions of
                           ----------------------
this Agreement shall inure to the benefit of and be binding upon the respective
successors and assigns of the parties.

                  (f)      Governing Law.  This Agreement shall be governed by
                           -------------
and construed under the internal laws of the State of Delaware, without
reference to principles of conflict of laws or choice of laws.

                  (g)      Counterparts. This Agreement may be executed in two
                           ------------
or more counterparts, each of which shall be deemed an original, but all of
which together shall constitute one and the same instrument.

                  (h)      Headings. The headings and captions used in this
                           --------
Agreement are used for convenience only and are not to be considered in
construing or interpreting this Agreement. All references in this Agreement to
sections, paragraphs, exhibits and schedules shall, unless otherwise provided,
refer to sections and paragraphs hereof and exhibits and schedules attached
hereto, all of which exhibits and schedules are incorporated herein by this
reference.

                  (i)      Notices. Any notice required or permitted under this
                           -------
Agreement shall be given in writing, shall be effective when received and shall
in any event be deemed received and effectively given upon personal delivery to
the party to be notified or three business days after deposit with the
United States Post Office, by registered or certified mail, postage prepaid, or
one

                                       13
<PAGE>

business day after deposit with a nationally recognized courier service,
such as FedEx, for next business day delivery under circumstances in which such
service guarantees next business day delivery, or one business day after
facsimile transmission, with a copy delivered by registered or certified mail,
in any case, postage prepaid and addressed to the party to be notified at the
address indicated for such party on the signature page hereof or at such other
address as the Investor or the Company may designate by giving at least 10 days'
advance written notice pursuant to this Section 6(h).

                  (j)      Amendments and Waivers. This Agreement may be amended
                           ----------------------
and the observance of any term of this Agreement may be waived (either generally
or in a particular instance and either retroactively or prospectively) only with
the written consent of the Company and the Investor.

                  (k)      Severability. If any provision of this Agreement is
                           ------------
held to be unenforceable under applicable law, such provision shall be excluded
from this Agreement and the balance of the Agreement shall be interpreted as if
such provision were so excluded and shall be enforceable in accordance with its
terms.

                  (l)      Entire Agreement. This Agreement, together with all
                           ----------------
exhibits and schedules hereto, constitutes the entire agreement and
understanding of the parties with respect to the subject matter hereof and
supersedes any and all prior negotiations, correspondence, agreements,
understandings, duties or obligations between the parties with respect to the
subject matter hereof.

                  (m)      Further Assurances. From and after the date of this
                           ------------------
Agreement, upon the request of the Company or the Investor, the Investor or the
Company, respectively, shall execute and deliver such instruments, documents or
other writings as may be reasonably necessary to confirm, carry out and
effectuate fully the intents and purposes of this Agreement.

                  (n)      Construction. Whenever in this Agreement the word
                           ------------
"include" or "including" is used, such term shall be deemed to mean "include,
without limitation," or "including, without limitation," or "including, but not
limited to," as the case may be, and the language following "include" or
"including" shall not be deemed to set forth an exhaustive list. The words
"hereof," "herein," "hereby," "hereunder" and similar terms in this Agreement
refer to this Agreement as a whole and not to any particular provision of this
Agreement. The word "or" is inclusive, unless the context otherwise requires.
Article, Section, subsection, paragraph, exhibit and schedule references are to
this Agreement unless otherwise specified.

                  (o)      Fees, Costs and Expenses. All reasonable fees, costs
                           ------------------------
and expenses (including attorneys' fees and expenses) incurred by either party
hereto in connection with the preparation, negotiation and execution of this
Agreement and the consummation of the transactions contemplated hereby
(including the costs associated with any filings with, or compliance with any of
the requirements of, any governmental authorities) shall be the sole and

                                       14
<PAGE>

exclusive responsibility of the Company, and the Company shall promptly
reimburse the Investor for any such fees, costs and expenses so incurred.

                  (p)      Dispute Resolution. The parties agree to negotiate in
                           ------------------
good faith to resolve any dispute between them regarding this Agreement. If the
negotiations do not resolve the dispute to the reasonable satisfaction of both
parties, then, except as otherwise provided in Section 5(c), each party shall
nominate one senior officer of the rank of Vice President or higher as its
representative. These representatives shall, within 30 days of a written request
by either party to call such a meeting, meet in person and alone (except for one
assistant for each party) and shall attempt in good faith to resolve the
dispute. If the dispute cannot be resolved by such senior officer in such
meeting, the parties agree that they shall, if requested in writing by either
party, meet within 30 days after such written notification for one day with an
impartial mediator and consider dispute resolution alternatives other than
litigation. If an alternative method of dispute resolution is not agreed upon
within 30 days after the one-day mediation, either party may begin litigation
proceedings. This procedure shall be a prerequisite before taking any additional
action hereunder.

                  (q)      Index of Defined Terms.  The following terms shall
                           ----------------------
have the respective meanings given to them in the sections indicated below:

Defined Term.............................................. Section
------------                                               -------
"Action "................................................. 3(h)
"Affiliate"............................................... 5(e)(i)
"Agreement"............................................... Preamble
"Amendment"............................................... Recitals
"Associate"............................................... 5(e)(ii)
"Board"................................................... 1(a)
"Certificate"............................................. 3(g)(i)
"Closing"................................................. 2
"Closing Date"............................................ 2
"Code".................................................... 3(o)(ii)
"Common Stock"............................................ Recitals
"Company"................................................. Preamble
"Company Reports"......................................... 3(d)(ii)
"Company Indemnitees"..................................... 5(a)(ii)
"Damages"................................................. 6(e)(iii)
"Disclosure Letter"....................................... 3
"ERISA"................................................... 3(q)
"Exchange Act"............................................ 3(d)(ii)
------------------------------------------------------------------------

                                       15
<PAGE>

Defined Term.............................................. Section
------------                                               -------
"Indemnifying Party"...................................... 5(a)(iii)
"Indemnitee".............................................. 5(a)(iii)
"Intellectual Property"................................... 3(l)(i)
"Investor"................................................ Preamble
"Investor Rights Agreement"............................... Recitals
"Material Adverse Effect"................................. 3(a)(ii)
"Person".................................................. 3(e)(ii)
"Preferred Stock"......................................... 3(b)(ii)
"Proceeding".............................................. 5(e)(iv)
"Purchased Shares"........................................ Recitals
"SEC"..................................................... 3(d)(i)
"Securities Act".......................................... 3(d)
------------------------------------------------------------------------

                                       16
<PAGE>

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

NAVISITE, INC.                                  CMGI, INC.

By: /s/ Joel Rosen                              By: /s/ Andrew J. Hajducky III
   -------------------------------------           -----------------------------
Name:  Joel Rosen                               Name:  Andrew J. Hajducky III
Title: Chief Executive Officer                  Title: Chief Financial Officer
                                                       and Treasurer

Address:                                        Address:

400 Minuteman Road                              100 Brickstone Square, 5th Floor
Andover, MA 01810                               Andover, Massachusetts  01810

Telephone No:  (978) 682-8300                   Telephone No: (978) 684-3600
Facsimile No:   (978) 688-8100                  Facsimile No:   (978) 684-3601

with copy to:                                   with copy to:

Philip P. Rossetti, Esquire                     David T. Brewster, Esquire
Hale and Dorr LLP                               Skadden, Arps, Slate, Meagher
60 State Street                                   & Flom LLP
Boston, Massachusetts 02109                     One Beacon Street, 31st Floor
                                                Boston, Massachusetts  02108

Telephone No:  (617) 526-6000                   Telephone No:  (617) 573-4800
Facsimile No:   (617) 526-5000                  Facsimile No:   (617) 573-4822<PAGE>

                                                                    Exhibit 10.2
                                 NAVISITE, INC.

                            INVESTOR RIGHTS AGREEMENT
                                 AMENDMENT NO. 1

          Simultaneous and in connection with the execution of a Common Stock
Purchase Agreement by and between NaviSite, Inc., a Delaware corporation (the
"Company"), and CMGI, Inc., a Delaware corporation (the "Investor"), the Company
and the Investor do hereby amend the Investor Rights Agreement dated as of
October 27, 1999 between the Company and the Investor (the "Investor Rights
Agreement") by this Amendment No. 1 to the Investor Rights Agreement, dated as
of June 8, 2000 (this "Amendment").

         The Investor Rights Agreement is hereby amended by replacing the
definition of "Registrable Shares" under "Section I, Certain Definitions" with
the following language:

                  "Registrable Shares" means (a) the shares of Common Stock held
                   ------------------
         by the Investor upon the closing of the Initial Public Offering; (b)
         the shares of Common Stock acquired by the Investor upon consummation
         of the transactions contemplated by the Common Stock Purchase Agreement
         between the Company and the Investor, dated as of June 8, 2000; and (c)
         any other shares of Common Stock issued in respect of such the shares
         of Common Stock referred to in clause (a) or (b) (because of stock
         splits, stock dividends, reclassifications, recapitalizations or
         similar events); provided, however, that shares of Common Stock which
         are Registrable Shares shall cease to be Registrable Shares upon (i)
         any sale pursuant to a Registration Statement or Rule 144 under the
         Securities Act or (ii) any sale in any manner to a person or entity
         which, by virtue of Section 3.4 of this Agreement, is not entitled to
         the rights provided by this Agreement.

<PAGE>

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

NAVISITE, INC.                              CMGI, INC.

By: /s/ Joel Rosen                          By: /s/ Andrew J. Hadjucky III
   --------------------------                  -----------------------------
Name:    Joel Rosen                         Name:    Andrew J. Hadjucky III
Title:   Chief Executive Officer            Title:   Chief Financial Officer
                                                     and Treasurer

Address:                                    Address:

40 Minuteman Road                           100 Brickstone Square, 5th Floor
Andover, Massachusetts  01810               Andover, Massachusetts  01810

Telephone No: (978) 682-8300                Telephone No:  (978) 684-3600
Facsimile No:   (978) 688-8100              Facsimile No:   (978) 684-3601

with copy to:                               with copy to:

Philip Rossetti, Esquire                    David T. Brewster, Esquire
Hale & Dorr LLP                             Skadden, Arps, Slate, Meagher
60 State Street                               & Flom LLP
Boston, Massachusetts 02108                 One Beacon Street, 31st Floor
                                            Boston, Massachusetts  02108

Telephone No:  (617) 526-6000               Telephone No:  (617) 573-4800
Facsimile No:   (617) 526-5000              Facsimile No:   (617) 573-4822

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