<PAGE>

                                                                   EXHIBIT 10.14

Confidential treatment has been requested with respect to certain information
contained in this document. Confidential portions have been omitted from the
public filing and have been filed separately with the Securities and Exchange
Commission.

                         INTERIM AMENDED AND RESTATED
                        ADVERTISING SERVICES AGREEMENT

          This ADVERTISING SERVICES AGREEMENT (this "Agreement"), effective as
                                                     ---------
of November 1, 1999 (the "Effective Date"), by and between DoubleClick Inc., a
                          --------------
Delaware corporation ("DoubleClick"), AltaVista Company, a Delaware corporation
                       -----------
(as successor to Compaq Computer Corporation) and AV Internet Solutions Ltd., an
Irish corporation (AV Internet Solutions Ltd., AltaVista Company, and the direct
and indirect subsidiaries of AltaVista Company, "AltaVista").

          WHEREAS, DoubleClick and Compaq Computer Corporation entered into an
Advertising Services Agreement as of January 1, 1999 (the "Existing Agreement");
                                                           ------------------

          WHEREAS, AltaVista is the successor in interest to Compaq Computer
Corporation's rights and obligations under the Existing Agreement;

          WHEREAS, DoubleClick and AltaVista desire that the Existing Agreement
be suspended and that this Agreement apply instead but only for the duration of
the period from January 1, 2000 until December 31, 2000 (except for Section 4.2
and 4.4, which shall apply from the Effective Date until December 31, 2000),
after which this Agreement shall cease to have effect and the Existing Agreement
shall again apply;

          WHEREAS, subject to Section 11.8, AltaVista intends to form an
internal sales force to solicit advertising for the Web Site; and

          WHEREAS, in furtherance of the objectives set forth above, the parties
hereto desire to enter into this Agreement.

          NOW, THEREFORE, in consideration of the foregoing and the mutual
covenants and agreements contained herein, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
DoubleClick and AltaVista, intending to be legally bound, hereby agree as
follows:

          As of the Effective Date Sections 4.2 and 4.4 of the Existing
Agreement are deleted in their entirety and replaced with the Sections numbered
4.2 and 4.4 below.

          As of January 1, 2000 the parties hereby agree that the Existing
Agreement is amended and restated in its entirety as set forth in this
Agreement.

          The parties agree that on January 1, 2001, the Existing Agreement
shall again apply and that apart from any obligations that survive pursuant to
Section 5.5(b) of this Agreement, this Agreement shall no longer be of any
effect on January 1, 2001.

          The parties further agree that DoubleClick may delegate its
obligations under this Agreement outside the United States to the Affiliates and
joint venture entities listed on Exhibit H, and to any other Affiliate or joint
venture entity that has been approved by AltaVista, which approval shall not be
unreasonably withheld.
<PAGE>

                                   ARTICLE I
                                  DEFINITIONS

     1.1  Definitions.  As used in this Agreement, the following terms shall
          -----------
have the meanings specified below:

          (a)  "Ad Sales Service" shall mean the services provided by
DoubleClick on behalf of AltaVista in relation to the Web Site pursuant to
Article III.

          (b)  "Advertiser" shall mean a Person who provides material, whether
directly or through its advertising agency, to promote itself, its brands or the
products or services that it offers.

          (c)  "Advertiser Contract" shall mean any contract with an Advertiser
relating to the sale of Advertising.

          (d)  "Advertising" or "Advertisement" shall mean any material
(including any graphical or textual element) provided by or on behalf of an
Advertiser that promotes a brand or products or services and which falls within
one of the following categories: (i) it is on the rate card for Advertising,
(ii) it is intended to be on the rate card for Advertising, or (iii) it is or
could be rotated between several different Advertisers without changing the
nature of the content or service on the Page where the advertising material
appears. Advertising shall not include the direct output or an aspect of such
output (e.g. prominent placement in such output, or prioritization of results)
or a hit within such output of a service that is solely for merchant listings,
product listings, or directory listings even though such output is being offered
or sold to an Advertiser ("Merchant Listings").

          (e)  "Affiliate" shall mean, with respect to any Person, any other
Person that, directly or indirectly, controls, is controlled by, or is under
common control with, such Person.

          (f)  "Agreement" shall mean this Agreement and the schedules, exhibits
and addenda attached hereto as the same may be amended, supplemented or modified
in accordance with the terms hereof.

          (g)  "Average Combined Pricing" shall have the meaning set forth in
Section 4.4 of this Agreement.

          (h)  "Average DART Only Fee" shall have the meaning set forth in
Section 4.4 of this Agreement.

          (i)  "Badge" shall mean a graphical element in a fixed location on a
Page designed for the delivery of Advertising that is, as of the Effective Date,
125x125 pixels, or the equivalent or smaller sizes, and shall, in all cases,
include all natural evolutions thereof. A current sample of a Badge is attached
hereto as Exhibit A.

          (j)  "Bad Debt" shall mean receivables for billed Net Revenues in
which collection has not been made and, in accordance with criteria set by
AltaVista, is deemed

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uncollectable.  In no event shall a receivable that is less than One Hundred and
Twenty (120) days past due be deemed uncollectable.

          (k)  "Banner" shall mean a graphical element in a fixed location on a
Page designed for the delivery of Advertising that is, as of the Effective Date,
468x60 pixels (file size up to 15K bytes), and shall include all natural
evolutions thereof. A current sample of a Banner is attached hereto as Exhibit
A.

          (l)  "Barter" shall mean the exchange or trade of any unsold inventory
on the Web Site for non-monetary consideration.

          (m)  "Beyond-the-Banner Arrangements" shall mean any arrangement, as
now existing or hereafter developed, for material provided by or on behalf of an
Advertiser that promotes a brand or products or services and is provided for
delivery to Users on a Page or Pages but does not constitute a Standard Ad Unit.
"Beyond-the-Banner Arrangements" include, but are not limited to, the following:
(i) ad units hereafter developed other than the Standard Ad Units (whether or
not such newly-developed ad unit requires integration with the content on the
Web Site); (ii) Pages on the Web Site that are customized so that they include
co-branding with, or sponsorship by, the Advertiser during the course of the
arrangements; and (iii) Pages on the Web Site that feature content created or
licensed from the Advertiser or another third party specifically for the
advertising campaign in question. Advertising campaigns may include both Beyond-
the-Banner Arrangements and Standard Ad Units.

          (n)  "Button" shall mean a graphical element in a fixed location on a
Page designed for the delivery of Advertising that is, as of the Effective Date,
88x33 pixels, and shall include all natural evolutions thereof. A current sample
of a Button is attached hereto as Exhibit A.

          (o)  "Centralized Internet Ad Company" shall mean any company that is
primarily engaged in the business of targeting, measuring and delivering
Advertising on the Internet via a network of web sites all linked to the
company's computers.

          (p)  "Comparable Customer" shall have the meaning set forth in Section
4.4 to this Agreement.

          (q)  "AltaVista" shall have the meaning set forth in the preamble to
this Agreement.

          (r)  "AltaVista Indemnitee" shall have the meaning set forth in
Section 7.2 to this Agreement.

          (s)  "Confidential Information" shall have the meaning set forth in
Section 10.1 to this Agreement.

          (t)  "Content Zone" shall mean either (i) any section of the Web Site
existing as of the date of this Agreement that contains editorial content,
whether such content is developed by AltaVista or licensed from a third party,
provided that the Standard Ad Units in such section had been sold by DoubleClick
prior to the Effective Date of this Agreement, or (ii)

                                       3
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any currently existing section of the Web Site that offers services to Users
(e.g., translation and e-mail services) other than services that would be
offered on a Home Page, Search Results Page or Directory Page.

          (u)  "Content Zone Page" shall mean any Page within a Content Zone.
For purposes of this Agreement, any Page that has attributes of a Content Zone
Page shall be deemed a "Content Zone Page", even if it also has attributes of a
Directory Page. However, any Page that has the attributes of a Content Zone Page
and also of a Home Page and/or Search Results Page shall be deemed to be a "Home
Page" or "Search Results Page" only, and shall in no event be deemed a "Content
Zone Page."

          (v)  "DART Service" shall mean a service provided by DoubleClick to
Web site publishers for the targeted and measured delivery of Advertising
through the System from DoubleClick's servers to specified Web sites based on
criteria selected by Advertisers.

          (w)  "Directory Page" shall mean any Page that contains a
comprehensive directory of Web sites, whether existing on the Web Site as of the
date of this Agreement or developed in the future. Any Page that has the
attributes of a Directory Page and of a Home Page, Search Results Page and/or
Content Zone Page shall be defined in accordance with the definitions of "Home
Page", "Search Results Page" and "Content Zone Page", and shall in no event be
deemed a "Directory Page."

          (x)  "DoubleClick" shall have the meaning set forth in the recitals to
this Agreement.

          (y)  "DoubleClick Competitor" shall mean any Person that is (i)
primarily engaged in the business of third party online advertising sales,
delivery, or tracking or otherwise engaged in third party online advertising
technology or services and/or (ii) listed in Exhibit F attached hereto;
provided, however, that a Person shall be deemed a "DoubleClick Competitor" if
it owns a division, business unit or similar entity that is primarily engaged in
the business of third party online advertising sales, delivery, or tracking or
otherwise engaged in third party online advertising technology or services.

          (z)  "DoubleClick Represented Pages" shall mean any Pages for which
DoubleClick may sell Advertising pursuant to the terms of this Agreement.

          (aa) "DoubleClick Indemnitee" shall have the meaning set forth in
Section 7.1 to this Agreement.

          (bb) "Effective Date" shall have the meaning set forth in the preamble
to this Agreement.

          (cc) "Existing Agreement" shall have the meaning set forth in the
recitals to this Agreement.

          (dd) "Existing Orders" shall have the meaning set forth in Section
3.8(e) to this Agreement.

                                       4
<PAGE>

          (ee) "Home Page" shall mean the Page initially presented to the User
when accessing the primarily advertised Web Site URL. For the purposes of this
Agreement, any Page that has the attributes of a Home Page shall be deemed to be
the "Home Page," even if it also has attributes of any of the following: a
Search Results Page, Content Zone Page and/or Directory Page.

          (ff) "HTML Modifications" shall have the meaning set forth in Section
3.7 to this Agreement.

          (gg) "Impression" shall mean each occurrence of Advertising on a Page
resulting from a User accessing or visiting such Page.

          (hh) "Indemnitee" shall have the meaning set forth in Section 7.3 to
this Agreement.

          (ii) "Indemnitor" shall have the meaning set forth in Section 7.3 to
this Agreement.

          (jj) "International Ads" shall mean Advertising offered to Non-U.S.
Advertisers.

          (kk) "Local Ads" shall mean Advertising offered to U.S. Advertisers to
target Users who are located in any of five or fewer U.S. states specified by
such U.S. Advertiser.

          (ll) "National Ads" shall mean Advertising offered to U.S. Advertisers
to target Users who are located in any of six or more U.S. states specified by
such U.S. Advertisers.

          (mm) "Net Payable" shall have the meaning set forth in Section 4.6 of
this Agreement

          (nn) "Net Revenue" shall mean the gross billings invoiced by
DoubleClick to Advertisers less rate card and volume discounts, rebates, make-
goods and third party agency commissions.

          (oo) "New Inventory" shall have the meaning set forth in Section 3.5
to this Agreement.

          (pp) "New Inventory Addendum" shall mean the addendum, to be signed by
both AltaVista and DoubleClick, that will confirm the New Inventory that will be
subject to this Agreement and the specific arrangements for such New Inventory.

          (qq) "New Web Site Area" shall have the meaning set forth in Section
3.5 to this Agreement.

          (rr) "Non-U.S. Advertiser" shall mean an Advertiser for which the
primary sales contact with respect to a given Advertising campaign is based in
Advertiser's offices outside of the United States; provided, however, that if an
Advertiser is represented by an

                                       5
<PAGE>

advertising agency, the primary sales contact shall be deemed to be the agency's
primary contact in the Advertiser's organization.

          (ss) "Page" shall mean a page on the Web Site that is linked to the
DART Service.

          (tt) "Paid Advertising" or "Paid Advertisement" shall mean (i)
Advertising which is paid for by an Advertiser; (ii) Advertising that is
provided to an Advertiser free of charge as a component of a Paid Advertising
campaign; and (iii) Advertising provided as a make-good to an Advertiser so long
as DoubleClick shall not receive credit more than once for such make-good.

          (uu) "Permitted Designees" shall mean any designee of AltaVista
provided that such Person is not a DoubleClick Competitor.

          (vv) "Person" shall mean any individual, firm, corporation,
partnership, trust, association, joint venture, company or other entity, or any
government authority.

          (ww) "Sales Policies" shall have the meaning set forth in Section 3.10
to this Agreement.

          (xx) "Search Results Page" shall mean the Page on any section of the
Web Site on which the results of a keyword search powered by the AltaVista
search engine appear.  For the purposes of this Agreement, any Page that has the
attributes of a Search Results Page shall be deemed to be a "Search Results
Page" only, even if it also has attributes of any of the following: Content Zone
Page or Directory Page.  However, any Page that has the attributes of both a
Search Results Page and Home Page shall be deemed a "Home Page" only, and shall
in no event be deemed a Search Results Page.

          (yy) "Services" shall mean, collectively, the DART Service, the Ad
Sales Service, and any other service provided by DoubleClick to AltaVista under
this Agreement.

          (zz) "Standard Ad Unit" shall mean a Banner, Badge, Button, Toolbox or
Text Link.

          (aaa)  "Strategic Advertiser" shall mean any Person that enters into a
Strategic Advertising Arrangement.

          (bbb)  "Strategic Advertising Arrangement" shall have the meaning set
forth in Section 3.3 to this Agreement.

          (ccc)  "System" shall mean DoubleClick's proprietary DART software
technology.

          (ddd)  "Term" shall have the meaning set forth in Section 5.1 to this
Agreement.

          (eee)  "Text Link" shall mean a hypertext link in a fixed location on
a Page designed for the delivery of Advertising that is, as of the Effective
Date, a 1x1 pixel tracking gif

                                       6
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(no more than two lines of text, no more than 20 characters per line), and shall
include all natural evolutions thereof. A current sample of a Text Link is
attached hereto as Exhibit A.

          (fff)  "Toolbox" shall mean a graphical element in a fixed location on
a Page designed for the delivery of Advertising that is, as of the Effective
Date, 131x190 pixels,and shall include all natural evolutions thereof. A current
sample of a Toolbox is attached hereto as Exhibit E.

          (ggg)  "Top Three" shall have the meaning set forth in Section 5.4 to
this Agreement.

          (hhh)  "Trademark Use Guidelines" shall have the meaning set forth in
Section 8.1 to this Agreement.

          (iii)  "Unpaid Advertising" or "Unpaid Advertisement" shall mean any
Advertisement that is not a Paid Advertisement. Examples of "Unpaid Advertising"
include (i) Advertisements that promote AltaVista, the Web Site, or their
respective products and services, and (ii) Advertisements Bartered by AltaVista
pursuant to Section 3.6.

          (jjj)  "U.S. Advertiser" shall mean an Advertiser for which the
primary sales contact with respect to a given Advertising campaign is based in
Advertiser's offices in the United States; provided, however, that if an
Advertiser is represented by an advertising agency, the primary sales contact
shall be deemed to be the agency's primary contact in the Advertiser's
organization.

          (kkk)  "User" shall mean any Person that accesses the Web Site.

          (lll)  "Web Site" shall mean (a) the AltaVista Web site currently
located at the URL http://www.altavista.com/ and (b) all other Web sites now or
                   -------------------------
hereafter owned or controlled by AltaVista (but only for so long as such Web
sites are owned or controlled by AltaVista), and all pages contained within each
of those Web sites hosted anywhere in the world. For purposes of this
definition, a Web site shall be deemed owned or controlled by AltaVista if
AltaVista owns, directly or indirectly, more than 50% of the Person that owns
the Web site. If, during the Term, AltaVista shall come to control additional
web sites through acquisitions and such web sites are subject to agreements
which existed prior to the acquisition and which prevent the inclusion of such
web site in the arrangements set forth in this Agreement, then such web sites
shall not constitute part of the "Web Site"; provided, however, that AltaVista
shall use reasonable commercial efforts to have such web sites included in the
arrangements set forth in this Agreement as soon as possible by either
terminating the preexisting agreements or not renewing the preexisting
agreements as they expire, as determined by AltaVista.

          (mmm)  "Year 1" shall mean the period from the Effective Date until
December 31, 1999.

          (nnn)  "Year 2" shall mean the period from January 1, 2000 to December
31, 2000.

                                       7
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          (ooo)  "Year 3" shall mean the period from January 1, 2001 through the
termination of this Agreement.

          (ppp)  "Year 2 Excluded Advertisers" shall have the meaning set forth
in Section 3.7 to this Agreement.

          (qqq)  "Year 3 Excluded Advertisers" shall have the meaning set forth
in Section 3.7 to this Agreement.

          (rrr)  "Acquisition Notice" shall have the meaning set forth in
Section 3.1(a) to this Agreement.

          (sss)  "Adjustment Commission" shall have the meaning set forth in
Section 3.3(e) to this Agreement.

          (ttt)  "Advertising Communication" shall mean a discussion, meeting or
other communication with an Advertiser concerning either a specific request for
proposal, a specific proposal, or a specific purchase that includes Advertising.
For purposes of this definition, "communication" shall include telephone calls,
faxes, letters, and email messages.

          (uuu)  "Aggregate Designated Keywords Impressions" shall mean the
aggregate Designated Keyword Impressions for a given period of time sold by
either DoubleClick or AltaVista.

          (vvv)  "AltaVista Account" shall mean an Advertiser for whom AltaVista
has the exclusive right to sell Advertising and where the primary sales contact
with respect to the majority of the Advertiser's advertising budget is based in
the Advertiser's offices in the United States; provided, however, that if an
Advertiser is represented by an advertising agency, the primary sales contact
shall be deemed to be the agency's primary contact in the Advertiser's
organization.

          (www)  "Channel Report" shall have the meaning set forth in Section
3.9(b) to this Agreement.

          (xxx)  "CMGI Company" shall have the meaning set forth in Section
3.3(b) to this Agreement.

          (yyy)  "CMGI Company Advertisement shall have the meaning set forth in
Section 3.1(b) to this Agreement.

          (zzz)  "Designated Keywords" shall mean the 500 keywords listed in
Exhibit G. Exhibit G shall be completed by DoubleClick and delivered to
AltaVista on or before December 1, 1999.

          (aaaa)  "Designated Keyword Impressions" shall mean the Impressions
for Banners that are delivered on the Search Results Pages generated when a User
has searched for any one of the Designated Keywords on any area or part of the
Web Site (excluding searches when a Designated Keyword is combined with any
other search term, typed incorrectly or is

                                       8
<PAGE>

otherwise entered in a format that is not identical to the representation of the
Designated Keyword in Exhibit G).

          (bbbb)  "DMZ Ad Unit" shall mean a hybrid graphical plus hypertext
Advertising element on a Search Results Page designed for the delivery of
Advertising that is, as of the Effective Date, 88 x 31 pixels packaged with
three lines of text and all natural evolutions thereof. The DMZ Ad Unit is
designed as a single ad unit for reporting and delivery purposes and does not
support reporting at a sub-item level.

          (cccc)  "DoubleClick Account" shall mean an Advertiser for whom
DoubleClick has the exclusive right to sell Advertising.

          (dddd)  "Engage" shall have the meaning set forth in Section 3.1(c) to
this Agreement.

          (eeee)  "Engage Arrangement" shall have the meaning set forth in
Section 3.3(c).

          (ffff)  "High Value Advertising" shall have the meaning set forth in
Section 4.7 to this Agreement.

          (gggg)  "Red Report" shall have the meaning set forth in Section
3.9(b) to this Agreement.

          (hhhh)  "User Profile" shall mean the set of known, assumed or
inferred attributes about a particular User which is created by DoubleClick as a
result of applying its proprietary statistical models or selection techniques to
User information in its data alliance database.

          (iiii)  "User Profile-Based Advertising" shall mean Advertising that
is targeted to Users based on the User Profiles.

          (jjjj)  "White Label Advertising" shall have the meaning set forth in
Section 3.1(c) to this Agreement.

                                  ARTICLE II
                                 DART SERVICE

     2.1  DART Service.
          ------------

          (a)  Subject to the terms and conditions of this Agreement,
DoubleClick hereby agrees to provide the DART Service to AltaVista for the Web
Site during the Term. Except for static Advertising that is hard-coded into
certain pages of the Web Site, all other Advertising placed on the Web Site by
AltaVista or DoubleClick shall be delivered exclusively by DoubleClick through
the DART Service. A description of the DART Service as of the date hereof is
attached hereto as Exhibit B. AltaVista shall not use any other third party ad
delivery service for the delivery of Advertising.

          (b)  DoubleClick grants to AltaVista the non-exclusive and non-
transferable (except as permitted pursuant to Section 11.8) right to access and
use the DART Service, which

                                       9
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AltaVista can access and use on DoubleClick's Web servers by means of a unique
password issued by DoubleClick, and for the purposes of: (i) performing
projections of Advertising Impression inventories that might be available
through the DART Service, (ii) uploading and storing Advertising for delivery by
DoubleClick through the DART Service, (iii) selecting trafficking criteria for
the delivery of Advertising to Users through the DART Service, and (iv)
receiving reports of Advertising Impressions and other data related to the
delivery of Advertising by the DART Service.

     2.2  AltaVista's DART Service Obligations.  AltaVista shall be responsible
          ------------------------------------
for soliciting Advertising, except to the extent such soliciting is conducted by
DoubleClick on behalf of AltaVista pursuant to this Agreement. With respect to
all Advertising sold by AltaVista that is delivered through the DART Service,
AltaVista shall be responsible for trafficking Advertising (which shall include
the input of Advertising into the System) and handling all inquiries of any type
or nature. Trafficking of Advertising may be outsourced to DoubleClick at
AltaVista's request and for additional fees (as set forth in Article IV below).
With respect to all Advertising sold by AltaVista that is delivered through the
DART Service, AltaVista shall obtain all necessary rights, licenses, consents,
waivers and permissions from Advertisers and others to allow DoubleClick to
store and deliver Advertising and otherwise operate the DART Service on
AltaVista's behalf and on behalf of AltaVista's Advertisers, and to use any data
provided to or collected by the System, and AltaVista agrees to comply with any
further requirements of the ad insertion orders agreed with DoubleClick.

     2.3  DoubleClick's DART Service Obligations.  DoubleClick's sole
          --------------------------------------
obligations in relation to the DART Service under this Agreement shall be (i) to
make the System available to AltaVista, (ii) to deliver Advertising through the
DART Service according to the trafficking criteria selected by AltaVista and
AltaVista's Advertisers using the System and (iii) to provide training sessions
explaining the proper use of the DART Service and the System.

     2.4  Proprietary Rights and Restrictions.  DoubleClick is the exclusive
          -----------------------------------
supplier of the DART Service and the exclusive owner of all right, title and
interest in and to the System, all software, databases and other aspects and
technologies related to the System and DART Service, including the System, and
any enhancements thereto. AltaVista shall not use the System or any data thereby
provided except pursuant to the limited rights expressly granted in this
Agreement. AltaVista shall use the System only in accordance with reference
manuals to be supplied by DoubleClick and only in accordance with DoubleClick's
standard security procedures, as posted on the DoubleClick Web site or otherwise
provided to AltaVista. AltaVista has the sole and exclusive right to use all
data derived by its use of the DART Service, for any purpose related to
AltaVista's business with Advertisers, provided that DoubleClick may use and
disclose the User data (other than personally-identifiable information) derived
from AltaVista's use of the DART Service pursuant to this Agreement only (i) for
DoubleClick's reporting purposes (consisting of the compilation of aggregated
statistics about the DART Service (e.g., the aggregate number of ads delivered)
that may subsequently be provided to customers, potential customers and
disclosed to the general public; (ii) if required by court order, law, or
governmental agency (including but not limited to, the Securities and Exchange
Commission); and (iii) to the extent necessary to integrate operation and
management of the Services for the Web Site within the operation and management
of the DART Service by DoubleClick for all its customers and otherwise for the
DoubleClick Network.

                                       10
<PAGE>

                                  ARTICLE III
                       ADVERTISING SALES REPRESENTATION

     3.1  AltaVista's Reservation of Rights.
          ---------------------------------

          (a)  After DoubleClick's appointment of its ten (10) DoubleClick
Accounts in accordance with Section 3.2 below and subject to Section 3.3 below,
AltaVista shall have the right (exercisable in AltaVista's sole discretion) to
designate Advertisers as AltaVista Accounts in accordance with the following
schedule (the dates specified are the "commencement dates" for each tranche of
AltaVista Accounts): sixty (60) Advertisers may become AltaVista Accounts on
January 1, 2000; thirty (30) additional Advertisers may become AltaVista
Accounts on April 1, 2000; thirty (30) additional Advertisers may become
AltaVista Accounts on July 1, 2000; and thirty (30) additional Advertisers may
become AltaVista Accounts on October 1, 2000 (making an aggregate of 150
accounts on October 1, 2000). In each case AltaVista shall provide thirty (30)
days prior written notice to DoubleClick of the Advertiser that AltaVista
desires to designate an AltaVista Account (each an "Acquisition Notice"). After
                                                    ------------------
AltaVista has selected an Advertiser to be an AltaVista Account and delivered an
Acquisition Notice to DoubleClick, AltaVista shall have the exclusive right to
sell Advertising to such AltaVista Account from the applicable commencement date
set forth in the schedule in this Section 3.1(a); provided, however, that if
thirty (30) days from the date of DoubleClick's receipt of the Acquisition
Notice has yet to expire at the applicable commencement date, that Advertiser
shall not be deemed to be an AltaVista Account until the thirty (30) day notice
period for the Acquisition Notice has expired. In the event that at any time
during the Term, AltaVista desires to conduct an Advertising Communication with
a current DoubleClick Account, then prior to making such Advertising
Communication AltaVista shall notify DoubleClick and invite DoubleClick to
participate in the initial meeting. After the initial meeting, AltaVista will
keep DoubleClick reasonably informed of the outcome of future meetings via a
timely and detailed status report. The foregoing shall not apply to an
Advertiser after the expiration of thirty days from the date of DoubleClick's
receipt of an Acquisition Notice in respect of such Advertiser and thereafter as
long as such Advertiser remains an AltaVista Account. In the unusual event that
AltaVista fails to follow proper procedure, then DoubleClick shall notify the
appropriate AltaVista executives to resolve the problem and, if the problem is
not promptly rectified or wherever the executives of DoubleClick and AltaVista
think appropriate, AltaVista shall pay to DoubleClick a deemed commission of
[***]% of the [***] month of AltaVista's gross revenues from such Advertiser.

[***] Denotes language for which AltaVista has requested confidential
treatment pursuant to the rules and regulations of the Securities Act of 1933,
as amended.

          (b)  Subject to Section 3.3 below, AltaVista may also sell to CMGI
Companies Advertising for the products or services of such CMGI Companies (each
a "CMGI Company Advertisement"); provided that such sales shall conform to all
   ------------ -------------
the terms of this Agreement, including without limitation, those with respect to
delivery through DART.

          (c)  Subject to Section 3.3 below, AltaVista may also enter into an
arrangement with Engage Technologies, Inc. and its subsidiaries ("Engage") which
                                                                  ------
shall allow Engage to sell "White Label Advertising" on the Web Site so long as
the "White Label Advertising" is delivered through DART. "White Label
                                                          -----------
Advertising" shall mean (i) Impressions for Banners that are untargeted and
-----------
sold to Advertisers such that the Advertisers know that their advertising may
appear on the Internet, but are unaware that the advertising will be
specifically

                                       11
<PAGE>

delivered on the Web Site and (ii) such Banners are preemptible by other
Advertising that is sold on the Web Site (i.e., bulk inventory).

          (d)  AltaVista retains the right to enter into Beyond-the-Banner
Arrangements with Non-U.S. Advertisers. The parties agree that both parties
shall be entitled to enter into Beyond-the Banner Arrangements with Non-U.S.
Advertisers, provided that AltaVista may not enter into any Beyond-the-Banner
Arrangements with the ten (10) DoubleClick Accounts designated by DoubleClick
pursuant to Section 3.2 below and AltaVista may not appoint any third party as
its representative for such Beyond-the-Banner Arrangements with Non-U.S.
Advertisers.

     3.2  Scope of Ad Sales Representation.  During the Term, subject to the
          --------------------------------
limitations stated herein and AltaVista's retained rights to sell set forth in
Section 3.1 above, DoubleClick and its authorized representatives, licensees and
assigns shall be AltaVista's sole and exclusive representative with respect to
Advertising and shall have the exclusive right to enter into agreements for such
Advertising on behalf of AltaVista.  In addition, on or before November 26, 1999
DoubleClick shall designate (in its sole discretion) any ten (10) current
Advertisers other than those that appear on Exhibit I, which Advertisers shall
remain DoubleClick Accounts throughout the Term and which cannot be designated
by AltaVista as AltaVista Accounts.

     3.3  Limitations on Advertising Sales by AltaVista.
          ---------------------------------------------

          (a)  AltaVista agrees that during the calendar year 2000, the
Designated Keyword Impressions delivered in each month pursuant to sales made by
AltaVista to the AltaVista Accounts shall not exceed the following maximum
percentages of Aggregate Designated Keyword Impressions: twenty percent (20%)
for each of [***] and [***]; [***] percent ([***]%) for each of [***]; [***]
percent ([***]%) for each of [***]; and fifty percent (50%) for each of [***].

[***] Denotes language for which AltaVista has requested confidential
treatment pursuant to the rules and regulations of the Securities Act of 1933,
as amended.

          (b)  AltaVista also agrees that during calendar year 2000 and for each
category of Advertising, the CMGI Company Advertisements (excluding those
Advertisements sold to CMGI Companies that have also been selected by AltaVista
as AltaVista Accounts) must in the aggregate represent less than one percent
(1%) of the aggregate Impressions delivered during the month for that category
of Advertising (aggregating Impressions for that category of Advertising sold by
either DoubleClick or AltaVista). AltaVista may not sell Advertisements to CMGI
Companies for the purpose of allowing such CMGI Companies to resell those
Advertisements to a third party. "CMGI Company" means any company which
                                  ------------
qualifies as an Affiliate (as defined in this Agreement) of CMGI, Inc. but
excluding any DoubleClick Competitor. Categories of Advertising for purposes of
this Section, shall be the categories used for pricing Advertising for
Advertisers (e.g., each size of Banner shall be a separate category). In the
event that AltaVista names CMGI Companies as AltaVista Accounts, those CMGI
Companies shall not (a) resell Advertisements to any third party and (b) be a
DoubleClick Competitor (provided that, for purposes of this Section 3.3(b) only,
CMGI, Inc. shall not constitute a DoubleClick Competitor).


                                       12
<PAGE>

          (c)  Subject to the limitations set forth in this Section 3.3(c),
AltaVista may enter into an arrangement with Engage (the "Engage Arrangement")
                                                          ------------------
which shall allow Engage to sell White Label Advertising according to one of the
two following structures:

               (i)  If the Engage Arrangement covers the entire Web Site, then
the Engage Arrangement must conform to the limitations set forth below for all
areas and parts of the Web Site:

Preemptible and Non-preemptible Scheme.  As between Engage, DoubleClick and
AltaVista and in accordance with the terms of this Agreement, DoubleClick and
AltaVista shall have the exclusive right to sell all non-preemptible Advertising
on the Web Site. However, both Engage and DoubleClick shall be entitled to sell
preemptible Banners (i.e., bulk inventory). For the preemptible Banners, (a) the
Banners with the highest CPM shall run on the Web Site and (b) AltaVista may
permit Engage to sell only up to five percent (5%) each month of all Impressions
that are for Banners. It is understood that DoubleClick may only sell User
Profile-Based Banners as preemptible Banners.

               (ii)  If the Engage Arrangement covers only pages in the
Shopping.com Web site, then the Engage Arrangement shall allow Engage exclusive
access to preemptible Banners on Shopping.com with any residual preemptible
Banner inventory on Shopping.com after such exclusive access being available for
DoubleClick to sell.

AltaVista shall provide to DoubleClick on January 1, 2000 a written notice of
its decision to elect for one of the two Engage Arrangements described in (i) or
(ii) above.

AltaVista agrees that it may allow Engage to use only one third party sales
agent in connection with Engage's rights hereunder; provided, however, that
AltaVista's contract with Engage expressly limits Engage's rights to use third
party sales agents to just one sales agent.

In all cases, AltaVista shall ensure that Engage delivers all Advertising
through DART.

          (d)  DoubleClick may implement technical means through the DART
Service to monitor and ensure compliance with Sections 3.3(a), (b) and (c)
above.

          (e)  Each quarter, DoubleClick shall audit the (i) Designated Keyword
Impressions and CMGI Company Advertisements sold by AltaVista, (ii) the White
Label Advertising sold by Engage and (iii) calculate what percentage such
Designated Keyword Impressions represents of the Aggregate Designated Keyword
Impressions for the same period, what percentage the CMGI Company Advertising
represents of the aggregate Impressions for each category of Advertising for the
same period and what percentage the White Label Advertising represents of the
aggregate Impressions for Banners that are preemptible by other Advertising on
the Web Site. DoubleClick shall promptly notify AltaVista of the results of this
audit via an email report. The sales commissions and billing and collections
fees set forth in Section 4.3 shall be applied to all Designated Keyword
Impressions, CMGI Company Advertising and White Label Advertising that are in
excess of the amount permitted within the applicable percentages for a
particular quarter and in each case such amounts shall be calculated based on a
deemed Net Revenues amount that is equal to the average price that DoubleClick
and AltaVista sold the Designated Keyword Impressions, the Impression within the
category of

                                       13
<PAGE>

Advertising or White Label Advertising during the same period (the "Adjustment
                                                                    ----------
Commission"). DoubleClick shall be entitled to offset the amount of any
----------
Adjustment Commission against any payments otherwise due from DoubleClick to
AltaVista under the terms of this Agreement. In addition to the above Adjustment
Commission remedy, in the event that the Aggregate Designated Keyword
Impressions sold by AltaVista exceeds the percentage permitted by Section 3.3(a)
above, the percentage of CMGI Company Advertisements exceeds the percentage
permitted by Section 3.3(b), or the percentage of White Label Advertising sold
by Engage exceeds the percentage permitted by Section 3.3(c) above, the
thresholds set forth in Sections 3.3(a), (b) and (c) above shall be reduced for
the next subsequent quarter by the number of Impressions by which AltaVista
exceeded the threshold in the prior quarter. In the last quarter of 2000,
DoubleClick's remedy under this Section 3.3(e) shall be limited to the
Adjustment Commission. In addition to the quarterly audit reports, DoubleClick
shall provide to AltaVista monthly reports detailing similar information to be
used for informational purposes only.

          (f)  Designations of Advertisers as AltaVista Accounts once made may
not be changed or exchanged for alternative Advertisers; provided, however, that
of the AltaVista Accounts designated on January 1, 2000 and April 1, 2000, up to
thirty-five (35) of those Advertisers may be exchanged for alternative
Advertisers (the "Returned Accounts") upon commencement of Year 3 of the
Existing Agreement and the remaining AltaVista Accounts that have been
designated by the end of calendar year 2000 shall constitute part of the Year 3
Excluded Advertisers for purposes of Year 3 and Section 3.7(c) of the Existing
Agreement when the Existing Agreement again comes into force on January 1, 2001.
AltaVista must provide DoubleClick with at least thirty days written notice
prior to December 31, 2000 of its desire to make an existing AltaVista Account a
Returned Account. In addition, from the date that a Returned Account ceases to
be an AltaVista Account, all Advertising sold by AltaVista to such Advertiser
which has yet to be delivered shall be deemed to have been sold by DoubleClick
and AltaVista shall pay to DoubleClick the commissions and fees required by
Article IV below in respect of such Advertising (or DoubleClick may deduct such
amount from payments otherwise due to AltaVista hereunder).

          (g)  Except for DoubleClick and as set forth in Section 3.1(c),
AltaVista shall not use or appoint any third party, including but not limited to
AdSmart, to sell any Advertising, Beyond-the-Banner Arrangements, Merchant
Listings or any other material provided by or on behalf of an Advertiser that
promotes a brand or products or services of that Advertiser.

     3.4  No Other Rights.  Other than as set forth in this Article III,
          ---------------
DoubleClick shall not have the right to place Advertising on the Web Site.

     3.5  New Web Site Areas.  The parties recognize that AltaVista will
          ------------------
regularly update the design and content and technology of the Web Site. As new
content channels (zones) are added to the Web Site, and except as provided in
Section 3.1 above, DoubleClick shall be sole and exclusive representative with
respect to such new Advertising and shall have the exclusive right to enter into
agreements for such Advertising, in accordance with Section 3.2 above.

     3.6  Unsold Inventory.  All unsold Advertising inventory may be Bartered by
          ----------------
AltaVista, subject to the fees set forth in Article IV.

                                       14
<PAGE>

     3.7  AltaVista's Ad Sales Service Obligations.
          ----------------------------------------

          (a)  AltaVista agrees to effect all necessary HTML programming with
respect to the Web Site and Pages in accordance with the HTML modifications (the
                                                                             ---
"HTML Modifications") designated by DoubleClick so as to enable DoubleClick to
-------------------
perform its obligations under this Agreement.

          (b)  At all times during the Term, each Search Results Page and
Directory Page shall include substantially the same number and type of
Advertising as were included on the corresponding or most closely analogous
Search Results Page or Directory Page prior to the Effective Date of this
Agreement, as illustrated on Exhibit A.

          (c)  AltaVista agrees that DoubleClick has no responsibility to review
the contents of Pages or the Web Site.

          (d)  AltaVista shall have the right at any time to ban and remove
Advertising from the Web Site to establish domain restrictions to prevent
delivery of Advertising linked to certain domains, by accessing the "Manage Site
Application" (located at www.doubleclick.net) of the DART Service interface or
otherwise.

          (e)  AltaVista acknowledges and agrees that all Advertising sold by
DoubleClick under the Existing Agreement for delivery after the Effective Date
shall be governed by the terms and conditions of this Agreement and AltaVista
shall pay DoubleClick the DART Service fee, sales commission, billing and
collections fees and other fees specified under Article IV of this Agreement for
all such Advertising delivered after the Effective Date.

     3.8  Dedicated Sales Specialists.  Until December 31, 2000, no fewer than
          ---------------------------
four DoubleClick sales specialists, reasonably acceptable to AltaVista, shall
be designated by DoubleClick as the Web Site's dedicated sales team. Promptly
after the Effective Date, DoubleClick shall use commercially reasonable efforts
to staff Web Site's dedicated sales team.

     3.9  DoubleClick's Ad Sales Service Obligations.
          ------------------------------------------

          (a)  Use of Information.  DoubleClick shall have the right to use for
               ------------------
DoubleClick's own use or for use in connection with potential Advertisers on the
Ad Sales Service, information concerning Pages, Impressions and Users accessing
Pages obtained through the Service, provided DoubleClick does not reproduce any
Pages without AltaVista's prior consent.

          (b)  Reporting.  In addition to the daily DART Service reports made
               ---------
available to AltaVista through DoubleClick's Web site (www.doubleclick.net),
DoubleClick shall use commercially reasonable efforts to deliver to AltaVista
within fifteen (15) days following the end of the month the following reports:
(i) a list of the Advertisers that have purchased Advertising through
DoubleClick, together with a summary of the nature of the order (type of
Advertising and Impressions) and revenue generated from such Advertiser; and
(ii) a four-month and twelve-month forecast of the Advertising scheduled to run
on the Web Site. In addition, DoubleClick shall use commercially reasonable
efforts to deliver to AltaVista within three (3) business days following the end
of the month the following reports: (i) monthly revenue by ad

                                       15
<PAGE>

placement report ("Red Report") and (ii) summary report of gross revenue for the
                   ----------
Web Site ("Channel Report"). During the Term, DoubleClick agrees also to
           --------------
provide AltaVista with such other reports as AltaVista may reasonably request;
provided that DoubleClick shall not be required to provide reports that are, in
DoubleClick's view, unduly burdensome to prepare. All reports and data provided
by DoubleClick to AltaVista are subject to the confidentiality obligations set
forth herein, and access to such reports and data online is subject to
DoubleClick's customary security procedures.

          (c)  Restrictions.  DoubleClick acknowledges that it shall abide by
               ------------
all reasonable restrictions placed on Advertisements on the Web Site by
AltaVista, including restrictions arising from exclusivity and non-compete
arrangements.

     3.10  Rate Card.  During the Term of this Agreement, AltaVista, in
           ---------
consultation with DoubleClick, shall set the rate card for all Advertising sold
by DoubleClick.  The current rate card as of the Effective Date is attached
hereto as Exhibit D.  In addition, AltaVista, in consultation with DoubleClick,
shall set the minimum and maximum term for Advertiser Contracts and such other
Advertising sales policies and parameters for sales of Advertising on the Web
Site as AltaVista may notify DoubleClick in writing from time to time, which
policies and parameters shall include credit and collections policies applicable
to Advertisers (collectively, the "Sales Policies").  The parties acknowledge
                                   --------------
and agree that both DoubleClick and AltaVista shall comply with the rate card
and the Sales Policies.  The parties acknowledge that the credit policies
included in the Sales Policies are not applicable to Advertising sales made by
DoubleClick on AltaVista's behalf prior to the date this Agreement was fully
executed by the parties.  Certain of the current Sales Policies are attached as
Exhibit J.

     3.11  New Advertising.  When new Advertising opportunities become available
           ---------------
on the Web Site during the Term (through the launch of a new Web Site, content
channel, page, Advertising unit or otherwise) DoubleClick's and AltaVista's
rights to sell such Advertising shall be as set forth in this Article III and
both parties' rights to promote, market and sell such new Advertising
opportunities shall commence at the same time.  AltaVista shall provide
DoubleClick with reasonable advance notice in writing of all new Advertising
opportunities and shall not offer to sell any of the new Advertising until the
date on which DoubleClick's rights to sell also commence.

     3.12  User Profile-Based Advertising.  DoubleClick hereby agrees to sell
           ------------------------------
User Profile-Based Advertising to Advertisers on the Web Site, subject to
Section 3.1.

                                  ARTICLE IV
                                 COMPENSATION

     4.1  Payments.  During the Term of this Agreement, AltaVista shall pay to
          --------
DoubleClick (i) a DART Services fee for all advertising delivered by DoubleClick
to the Web Site, (ii) a sales commission based on the Net Revenues generated
from all Advertising sold by DoubleClick on behalf of AltaVista, for all sales,
customer support and other services (other than billing and collections
services) that DoubleClick performs on behalf of AltaVista (which shall include
Net Revenues from Advertising sold by DoubleClick to an Advertiser prior to the
date on which AltaVista may commence sales of Advertising to that Advertiser in
accordance with

                                       16
<PAGE>

Section 3.1(a) above, including Advertising that will be delivered after the
date on which AltaVista may commence sales of Advertising to the Advertiser) and
(iii) a billing and collections fee for all billing and collections services
performed by DoubleClick on behalf of AltaVista in relation to Advertising sold
by DoubleClick, based on the Net Revenues generated from such Advertising.

     4.2  DART Services Fee.
          -----------------

          (a)  Delivery of U.S. Ads.  AltaVista shall pay the following DART
               --------------------
fees for all Advertising that is delivered by DoubleClick from the Effective
Date through December 31, 2000:
<TABLE>
<S>                        <C>                 <C>                  <C>
Category                   0-0.5 per month     0.5-2B per month     Over 2B per month
-------------------------------------------------------------------------------------
Banners                    $[***] CPM          $[***] CPM           $[***] CPM
-------------------------------------------------------------------------------------
125 x 125 (and smaller)    $[***] CPM          $[***] CPM           $[***] CPM
-------------------------------------------------------------------------------------
DMZ Sponsorship Unit       $[***] CPM          $[***] CPM           $[***] CPM
 (and smaller)
-------------------------------------------------------------------------------------
Text Links                 $[***] CPM          $[***] CPM           $[***] CPM
-------------------------------------------------------------------------------------
House Redirects            $[***] CPM
-------------------------------------------------------------------------------------
</TABLE>
Volumes shall be determined by aggregating the total number of Impressions
within a category on a worldwide basis.

[***] Denotes language for which AltaVista requested confidential treatment
pursuant to the rules and regulations of the Securities Act of 1933, as amended.

          (b)  Tracking and Trafficking Fees.  In addition to one of the
               -----------------------------
payments required by Section 4.2(a) above, AltaVista shall also pay the
following fees to the extent that the following Services from DoubleClick are
utilized during the Term:

          (i)  A tracking fee of [***] CPM for optional pixel tracking services
               (which fee is applicable only to Advertising sold by AltaVista);
               and

          (ii) A trafficking fee of [***] CPM for all advertising not placed by
               DoubleClick that is trafficked by DoubleClick.

[***] Denotes language for which AltaVista requested confidential treatment
pursuant to the rules and regulations of the Securities Act of 1933, as amended.

          (c)  Delivery of International Ads.  DoubleClick may impose the
               -----------------------------
following CPM premiums for International Ads:

                         Canada       - $[***]
                         UK           - $[***]
                         Hong Kong    - $[***]
                         Germany      - $[***]
                         Italy        - $[***]
                         France       - $[***]
                         Scandinavia  - $[***]
                         Australia    - $[***]
                         Japan        - $[***]
                         Brazil       - $[***]
                         South Africa - $[***]

[***] Denotes language for which AltaVista requested confidential treatment
pursuant to the rules and regulations of the Securities Act of 1933, as amended.


                                       17
<PAGE>


          (d)  Pricing for Delivery of Ads Placed by AltaVista.  The parties
               -----------------------------------------------
shall meet, commencing on December 1, 1999, to determine whether the DART fees
specified in Section 4.2(a) to be in effect for Year 2 for the delivery of
Advertising placed by AltaVista should be adjusted. The parties would also meet,
commencing on December 1, 2000, to determine whether the DART fees in effect in
Year 3 should be adjusted.

     4.3  Ad Sales Commission and Billing/Collections Fees.  AltaVista shall pay
          ------------------------------------------------
to DoubleClick (i) the sales commissions set forth below for all the Ad Sales
Service, support, and other services (other than billing and collections
services) that DoubleClick performs on behalf of AltaVista and (ii) the billing
and collections fees set forth below for all billing and collections services
performed by DoubleClick in relation to Advertising sold by DoubleClick on
behalf of AltaVista, in each case based on the Net Revenues generated from all
Advertising sold by DoubleClick on behalf of AltaVista (which shall include Net
Revenues from Advertising sold by DoubleClick to an Advertiser prior to the date
on which AltaVista may commence sales of Advertising to that Advertiser in
accordance with Section 3.1(a) above, including Advertising that will be
delivered after the date on which AltaVista may commence such sales to the
Advertiser):

<TABLE>
<CAPTION>
                             Billing and                Sales Commission to DoubleClick
                             Collections    -----------------------------------------------------------
Period During Term              Fee              National Ads        International Ads        Local Ads
-------------------------------------------------------------------------------------------------------
<S>                          <C>                 <C>                 <C>                      <C>
Year 1                           [***]                [***]                  [***]               [***]
-------------------------------------------------------------------------------------------------------
Year 2                           [***]                [***]                  [***]               [***]
-------------------------------------------------------------------------------------------------------
Year 3                           [***]                [***]                  [***]               [***]
-------------------------------------------------------------------------------------------------------
</TABLE>

All sales commissions and billing and collections fees based on Net Revenue
shall be determined using the above chart and based upon the date upon which the
Advertising is sold.  If a campaign continues from one calendar year into the
next, the rates applicable at the start of the campaign shall apply for the
whole campaign.  For National Ads sold before any termination by AltaVista of
DoubleClick's rights under this Agreement, DoubleClick shall be entitled to
receive the sales commission and billing and collections fees for those National
Ads over the life of the campaign, even if the campaign continues to run after
the effective date of AltaVista's termination of those rights.

[***] Denotes language for which AltaVista has requested confidential
treatment pursuant to the rules and regulations of the Securities Act of 1933,
as amended.

     4.4  Most Favored Nation.  AltaVista shall not be entitled to a most
          -------------------
favored nation status.


     4.5  Training; Sales Engineer Services.  DoubleClick shall provide
          ---------------------------------
one training session on the DART Service at DoubleClick's offices in New York
City at no charge to

                                       18
<PAGE>

AltaVista.  All additional training and other DoubleClick personnel days shall
be charged for at DoubleClick's customary rates.

     4.6  Invoicing.  On a monthly basis, DoubleClick shall remit to AltaVista
          ---------
the Net Payable. The "Net Payable" shall mean the sum of the cash collections
for Advertising actually received by DoubleClick during the month, less amounts
payable to DoubleClick for services rendered in respect of or based on
Advertising delivered and/or sold by DoubleClick on behalf of AltaVista during
the month or still owed to DoubleClick in respect of past months: the DART
Service fees, sales commissions on amounts received, and billing and collections
fees and any other fees payable to DoubleClick pursuant to this Agreement in
total. DoubleClick shall use commercially reasonable efforts to deliver to
AltaVista within [***] business days following the end of the month the
accounts receivable aging report. The Net Payable will be remitted to AltaVista
on or before the fifteenth day following the end of the month (or on the next
business day if the fifteenth day following the end of the month falls on a
weekend or holiday).

[***] Denotes language for which AltaVista has requested confidential
treatment pursuant to the rules and regulations of the Securities Act of 1933,
as amended.

          The bill accompanying the net payable will set forth the cash
collections generated from non-U.S. Advertisers and the costs associated with
this revenue, which amount shall be billed to AV Internet Solutions Ltd., and
the cash collections from U.S. Advertisers and the costs associated with this
revenue, which amount shall be billed to AltaVista Company.

          On a calendar quarterly basis, AltaVista may charge DoubleClick an
amount equal to the applicable ad sales commission multiplied by the amount of
Bad Debt charged in the applicable quarter; provided that such amount shall not
exceed [***]% of Net Revenues recorded in such quarter. AltaVista shall notify
DoubleClick of the amount of such charge within [***] days after the end of
calendar quarter and DoubleClick shall pay Company the amount of such charge
within [***] days of DoubleClick's receipt of such notice. Notwithstanding the
foregoing, DoubleClick shall be charged the full amount of Bad Debt associated
with any Advertising sales made by DoubleClick on AltaVista's behalf in
violation of AltaVista's Sales Policies (other than deviations made with
AltaVista's prior consent at the time of the sale).

[***] Denotes language for which AltaVista has requested confidential
treatment pursuant to the rules and regulations of the Securities Act of 1933,
as amended.

     4.7  Opportunity Cost.  All Advertising placed by AltaVista and DoubleClick
          ----------------
shall normally be subject to pre-existing Advertising sales of the other party.
"Pre-existing Advertising" shall be determined based solely on the date the
Advertising sale is entered into the System; provided, however, that the parties
shall discuss giving alternative priority to Advertising sales where to do so
would be in the best interests of both parties.  In the unusual event that (i)
DoubleClick is required by AltaVista to cancel any Advertising sold by
DoubleClick on behalf of AltaVista to avoid a conflict with an advertising
agreement entered into by AltaVista and (ii) no alternative Advertising programs
acceptable to Advertiser are available through DoubleClick, AltaVista shall (i)
remit to DoubleClick the sales commission to which DoubleClick would have been
entitled had the campaign run its full course, by the dates such payments would
have been due hereunder, assuming the cancelled Advertising had been paid when
due, (ii) AltaVista shall be solely responsible for any compensation due to the
Advertiser whose Advertising campaign has been cancelled and (iii) AltaVista
shall indemnify DoubleClick against any other loss, damages or claims of the
Advertiser against DoubleClick that relate solely to such cancellation.

                                       19
<PAGE>

However, the foregoing provision shall not apply to:

          (i)  Advertising that AltaVista, acting in good faith, identified to
               DoubleClick in advance and in writing as being unavailable, if
               DoubleClick nonetheless sells such Advertising after its receipt
               of such notice.

          (ii) High Value Advertising campaigns for which DoubleClick has not
               received prior AltaVista approval; it being understood that such
               approval shall not be unreasonably withheld and that failure by
               AltaVista to respond within twenty-four (24) hours (Monday-
               Friday) to a request for approval shall be considered approved.
               "High Value Advertising" shall mean any Advertising campaign that
                ----------------------
               either (i) has a value of greater than $[***] and a duration of
               greater than 3 months or (ii) has a value of greater than
               $[***] and a duration of greater than 6 months. DoubleClick may
               resubmit proposals for High Value Advertising if the Advertising
               in question remains unsold five (5) days or more after the date
               of the original proposal.

     In the instances of (i) and (ii) above, DoubleClick shall be responsible
     for any compensation due to the Advertiser whose Advertising campaign has
     been cancelled.

     In addition, during the thirty (30) day period following an Acquisition
     Notice, the parties agree that in addition to the limitations set forth in
     (i) and (ii) above, DoubleClick also agrees not to sell any Advertising to
     the Advertiser that is the subject of the Acquisition Notice at rates that
     are less than 95% of standard rate card rates for such Advertising without
     receiving AltaVista's prior written consent; it being understood that such
     approval shall not be unreasonably withheld and that failure by AltaVista
     to respond within three (3) days to a request for approval shall be
     considered approved.

     4.8  [***]

[***] Denotes language for which AltaVista has requested confidential
treatment pursuant to the rules and regulations of the Securities Act of 1933,
as amended.

                                       20
<PAGE>

     4.9  AltaVista's Costs.  AltaVista shall be solely responsible for any
          -----------------
costs or expenses it incurs in connection with the Services or performance of
its obligations under this Agreement including, without limitation, expenses
associated with any HTML programming and linking Pages to the DART Service.

     4.10 DoubleClick's Costs.  DoubleClick shall be solely responsible for any
          -------------------
costs or expenses it incurs in connection with the provision of the Services or
performance of its obligations under this Agreement including, without
limitation, expenses associated with any costs of operating and maintaining the
DART Service.

     4.11 Taxes.  Each party shall be responsible for the payment of taxes
          -----
imposed on that party and shall withhold taxes which, in its reasonable belief,
it is required to withhold from payments to the other party. DoubleClick will be
responsible for billing, collecting and remitting, all applicable taxes on
similar levies with respect to Advertisements which it places.

                                   ARTICLE V
                              TERM & TERMINATION

     5.1  Term.  This Agreement shall be for a period from the Effective Date
          ----
until December 31, 2000 (the "Term").  Upon expiration of the Term or earlier
                        ----
termination of this Agreement pursuant to Sections 5.3 and 5.4 below, the
Existing Agreement shall automatically replace this Agreement.

     5.2  Intentionally left blank.

     5.3  Termination for Breach.  In the event of a material breach of a
          ----------------------
material provision of this Agreement, the non-breaching party may give written
notice of such breach to the breaching party and if the breaching party fails to
cure such breach within ninety (90) days of receipt of such notice, the non-
breaching party may terminate this Agreement once the cure period has expired.

     5.4  Termination by AltaVista for Certain Changes.  In addition to its
          --------------------------------------------
right to terminate specified above, AltaVista shall also have the right to
terminate this Agreement if any of the following events occur:

          (a)  DoubleClick is found by reputable independent sources on the
basis of verifiable data based on an analysis of a period of not less than 180
days, to no longer be one of the top three Centralized Internet Ad Delivery
Companies measured on the basis of the aggregate number of Impressions served by
each Centralized Internet Ad Delivery Companies in such period (the "Top
                                                                     ---
Three");
-----
          (b)  DoubleClick ceases to operate or provide technical support for
the DART Service for a period in excess of five (5) business days;

          (c)  DoubleClick is adjudged insolvent or bankrupt;

          (d)  Institution of any proceeding by DoubleClick seeking relief,
reorganization or arrangement under any laws relating to insolvency;

                                       21
<PAGE>

          (e)  Institution of any proceeding against DoubleClick seeking relief,
reorganization or arrangement under any laws relating to insolvency that is not
dismissed within sixty (60) days;

          (f)  The making of any assignment for the benefit of creditors;

          (g)  Upon the appointment of a receiver, liquidator or trustee of any
of DoubleClick's property or assets, or upon liquidation, dissolution or winding
up of the DoubleClick's business; or

          (h)  In the event that a Person who owns, either directly or
indirectly, a Web site that is widely regarded by recognized Internet industry
analysts as a direct competitor of the Web Site acquires (i) through a merger
or consolidation pursuant to which the stockholders of DoubleClick immediately
prior to such merger or consolidation will not own, immediately after such
merger or consolidation, at least forty percent (40%) of the voting power of the
surviving Person's voting securities, whether or not such Person is DoubleClick,
(ii) securities representing a majority of DoubleClick's voting securities as a
result of a tender or exchange offer, open market purchase, privately negotiated
purchases, share exchange, extraordinary dividend, acquisition, disposition or
recapitalization (or series of related transactions of such nature) (other than
a merger or consolidation), or (iii) all or substantially all of DoubleClick's
assets.

     5.5  Effect of Termination.
          ---------------------

          (a)  Notwithstanding anything to the contrary contained herein, in the
event this Agreement is terminated and DoubleClick, prior to said termination,
has entered into any Advertiser Contracts for the delivery of Advertising to the
Pages, the duration of which Advertiser Contracts extend beyond the date on
which this Agreement has been terminated, and such Advertising continue to be
delivered after the termination of this Agreement, then DoubleClick shall be
entitled to receive (i) sales commissions and billing and collections fees for
such Advertising calculated on the basis of the applicable sales commission and
billing and collections fees that would have been due under Section 4.3 above as
of the effective date of the Advertising Contract for the type of Advertising in
question and (ii) where the parties mutually agree that DoubleClick should
continue to deliver said Advertising on behalf of AltaVista, the applicable DART
Service fees specified in Section 4.2.

          (b)  The following provisions of this Agreement and any causes of
action arising in relation to this Agreement prior to termination, shall survive
such termination: Sections 3.3(f), 7.1 through 7.3, 9.1, 9.2, and 10.1 and
Article V.

                                  ARTICLE VI
                        REPRESENTATIONS AND WARRANTIES

     6.1  AltaVista's Representations and Warranties.  AltaVista represents and
          ------------------------------------------
warrants at all times that AltaVista (i) owns the Web Site, and (ii) has the
right and full power and authority to enter into this Agreement, to grant the
rights herein granted and fully to perform its obligations hereunder. AltaVista
acknowledges that the System can be used to target, measure and traffic
advertisements in many different ways and based on many difference types of
data.  AltaVista represents and warrants that it will not use the System or the
DART Service in a way

                                       22
<PAGE>

or for any purpose that infringes or misappropriates any third party's
copyrights, U.S. patents issued as of the Effective Date, trademarks or trade
secrets.

     6.2  DoubleClick's Representations and Warranties. DoubleClick represents
          --------------------------------------------
and warrants that (i) it owns the DART Service and the System, (ii) it has the
right and full power and authority to enter into this Agreement, to grant the
rights herein granted and fully to perform its obligations hereunder, and (iii)
the System was developed by DoubleClick without infringement or misappropriation
of any third party's copyrights, U.S. patents issued as of the Effective Date,
trademarks or trade secrets.

                                  ARTICLE VII
                                  INDEMNITIES

     7.1  AltaVista's Indemnities.  AltaVista agrees to indemnify and hold
          -----------------------
DoubleClick and its Affiliates, officers, directors, employees and agents (each
a "DoubleClick Indemnitee") harmless from and against any and all claims,
   ----------------------
actions, losses, damages, liability, costs and expenses (including, without
limitation, reasonable attorneys' fees and disbursements incurred by a
DoubleClick Indemnitee in any action between AltaVista and the DoubleClick
Indemnitee, or between the DoubleClick Indemnitee and any third party or
otherwise) arising out of or in connection with any breach of any of AltaVista's
representations, warranties or obligations set forth in this Agreement.
DoubleClick shall promptly notify AltaVista of all claims and proceedings
related thereto of which DoubleClick becomes aware.

     7.2  DoubleClick's Indemnities.  DoubleClick agrees to indemnify and hold
          -------------------------
AltaVista and its Affiliates, officers, directors, employees and agents (each a
"AltaVista Indemnitee") harmless from and against any and all claims, actions,
 --------------------
losses, damages, liability, costs and expenses (including, without limitation,
reasonable attorneys' fees and disbursements incurred by a AltaVista Indemnitee
in any action between DoubleClick and the AltaVista Indemnitee, or between the
AltaVista Indemnitee and any third party or otherwise) arising out of or in
connection with any breach of DoubleClick's representations, warranties or
obligations set forth in this Agreement.  AltaVista shall promptly notify
DoubleClick of all claims and proceedings related thereto of which AltaVista
becomes aware.

     7.3  Procedure.  The Indemnitee ("Indemnitee") that intends to claim
          ---------                    ----------
indemnification under this Agreement shall promptly notify the other party (the
"Indemnitor") of any claim, demand, action or other proceeding for which the
 ----------
Indemnitee intends to claim such indemnification, and the Indemnitor shall have
the right to participate in, and, to the extent the Indemnitor so desires, to
assume sole control of the defense thereof with counsel selected by the
Indemnitor; provided, however, that the Indemnitee shall have the absolute right
to retain its own counsel, with the fees and expenses to be paid by the
Indemnitee.  The indemnity obligations under this Agreement shall not apply to
amounts paid in settlement of any loss, claim, damage, liability or action if
such settlement is effected without the consent of the Indemnitor, which consent
shall not be unreasonably withheld or delayed.  The failure to deliver notice to
the Indemnitor within a reasonable time after the commencement of any such
action, if prejudicial to Indemnitor's ability to defend such action, shall
relieve the Indemnitor of any liability to the Indemnitee under this Article
VII.  The Indemnitee, its employees, agents, officers, directors and

                                       23
<PAGE>

partners shall cooperate fully with the Indemnitor and its legal representatives
in the investigation of any action, claim or liability covered by an
indemnification from the Indemnitor.

                                 ARTICLE VIII
                             ANCILLARY OBLIGATIONS

     8.1  Web Site Co-Marketing.  Each party shall have the right to create
          ---------------------
promotional materials for the Web Site and Advertising on the Web Site, provided
that each party's use of the other party's trade name and trademarks is subject
to (i) the other party's approval, which shall not be unreasonably withheld or
delayed and (ii) compliance with the other party's standards and guidelines as
to proper use of such party's trade name and trademarks ("Trademark Use
                                                          -------------
Guidelines").  Each party's Trademark Use Guidelines are attached hereto as
----------
Exhibits E-1 and E-2.  All use of the other party's trade name and trademarks is
by way of license only and only for the limited purposes of creating and
distributing the promotional materials during the Term.  Each party shall comply
with the requests of the other party in relation to correct usage of the other
party's trademarks and shall promptly make any  changes to the use being made of
the other party's trademarks and trade names if such change is requested by
other party.

     8.2  Non-Solicitation.  During the Term and for a one-year period following
          ----------------
expiration or termination of this Agreement:

          (a)  AltaVista agrees for itself and for all its controlled
subsidiaries not to (i) solicit for employment (whether directly or indirectly)
any employee of DoubleClick or (ii) employ any former employee of DoubleClick
within sixty (60) days of such former employee leaving DoubleClick; and

          (b)  DoubleClick agrees for itself and for all its controlled
subsidiaries not to (i) solicit for employment (whether directly or
indirectly) any employee of AltaVista or (ii) employ any former employee of
AltaVista within sixty (60) days of such former employee leaving the AltaVista.

For purposes of this Section 8.2, controlled subsidiaries are those subsidiary
companies where a party to this Agreement owns, directly or indirectly, 50% or
more of that company's stock.

                                  ARTICLE IX
                   DISCLAIMERS AND LIMITATIONS ON LIABILITY

     9.1  WARRANTY DISCLAIMERS.
          --------------------

          (a)  DOUBLECLICK DISCLAIMER.  EXCEPT AS SET FORTH IN THIS AGREEMENT,
               ----------------------
DOUBLECLICK MAKES NO WARRANTIES OF ANY KIND TO ANY PERSON WITH RESPECT TO THE
SERVICES, THE SYSTEM, ANY ADVERTISING OR ANY DATA SUPPLIED, WHETHER EXPRESS OR
IMPLIED, INCLUDING ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE OR NONINFRINGEMENT.

          (b)  ALTAVISTA DISCLAIMER.  EXCEPT AS SET FORTH IN THIS AGREEMENT,
               --------------------
ALTAVISTA MAKES NO WARRANTIES OF ANY KIND TO ANY

                                       24
<PAGE>

PERSON WITH RESPECT TO THE WEB SITE, ANY ADVERTISING OR ANY DATA SUPPLIED,
WHETHER EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED WARRANTIES OF MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT.

     9.2  Limitation and Exclusion of Liability.  Neither party shall be liable
          -------------------------------------
to the other party, any Advertisers or any other third party for any loss, cost,
damage or expense incurred in connection with the unavailability or
inoperability of the System, the Services or the Internet, technical
malfunction, computer error or loss or corruption of data, or other injury,
damage or disruption of any kind related thereto.  In no event shall either
party be liable for any indirect, incidental, consequential, special or
exemplary damages, including, but not limited to, loss of profits, or loss of
business opportunity, even if such damages are foreseeable and whether or not
the other party has been advised of the possibility thereof.  Except in relation
to a claim against a party based on its breach of its representations and
warranties in this Agreement as to infringement and misappropriation of third
party copyrights, patents, trademarks or trade secrets, each party's maximum
aggregate liability shall not exceed the total amount paid by AltaVista to
DoubleClick under this Agreement or the Existing Agreement during the twelve
(12) month period prior to the first date the liability arose. In all Advertiser
Contracts the parties shall use reasonable efforts to include a provision that
will state that the other party is a third party beneficiary of any disclaimers
and limitations or exclusions of liability that such party has agreed to with
the Advertiser in the Advertiser Contract.



                                   ARTICLE X
                                CONFIDENTIALITY

     10.1  Confidentiality.
           ---------------

          (a)  The terms of this Agreement and information and data that either
party has received or will receive from the other party about the Services, the
System and other matters relating to the respective businesses of the parties is
proprietary and confidential information of the disclosing party ("Confidential
                                                                   ------------
Information"), including without limitation any information that is marked as
-----------
"confidential" or should be reasonably understood to be confidential or
proprietary to the disclosing party and any reference manuals compiled or
provided hereunder. Each party agrees that for the Term and for two (2) years
thereafter, it will not disclose to any third party nor use for any purpose not
permitted under this Agreement any Confidential Information disclosed to it by
the other party. The nondisclosure obligations set forth in this Section shall
not apply to information that the receiving party can document is generally
available to the public (other than through breach of this Agreement by the
receiving party) or was already lawfully in the receiving party's possession at
the time of receipt of the information from the disclosing party.

          (b) Notwithstanding 10.1(a) above, AltaVista may disclose a copy of
this Agreement and information contained in this Agreement to CMGI, Inc. for the
sole purpose of CMGI, Inc.'s internal review and obtaining CMGI, Inc.'s approval
and for no other purposes. CMGI, Inc. may only disclose the Agreement to those
of its employees that have a need to know and shall not disclose the Agreement
to any third party or use it for any other purpose. AltaVista

                                       25
<PAGE>

shall be liable to DoubleClick for any breach of the above confidentiality
restrictions by CMGI, Inc. or any of CMGI, Inc.'s employees.


                                  ARTICLE XI
                              GENERAL PROVISIONS

     11.1  Independent Contractor Status.  Each party shall be and act as an
           -----------------------------
independent contractor and not as partner, joint venturer or agent of the other.

     11.2  Governing Law.  This Agreement shall be governed by, and construed in
           -------------
accordance with the laws of the State of New York, without regard to the
principles of conflicts or choice of law of any jurisdiction.

     11.3  Dispute Resolution.  The parties shall attempt to settle any claim or
           ------------------
controversy arising out of this Agreement through consultation and negotiation
in good faith and spirit of mutual cooperation.  In the event that any dispute
arises between the parties in connection with any subject matter of this
Agreement, the dispute will be referred to a senior-level manager of each party
involved in the day-to-day performance of this Agreement, who shall promptly
meet and endeavor to resolve the dispute in a timely manner.  In the event such
individuals are unable to resolve such dispute within ten (10) days from the
commencement of the dispute, the matter shall be referred to the Chief Executive
Officer ("CEO") of each party, who shall promptly meet and endeavor to resolve
          ---
the dispute.  In the event that the respective CEOs of the parties are unable to
resolve such dispute within ten (10) days, the dispute shall be deemed an
unresolved dispute and either party may commence litigation in a court having
proper jurisdiction to resolve such dispute.

     11.4  Severability.  Any provision of this Agreement which is prohibited or
           ------------
unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective
only to the minimum extent necessary without invalidating the remaining
provisions of this Agreement or affecting the validity or enforceability of such
provisions in any other jurisdiction.

     11.5  Force Majeure.  No failure or omission by the parties hereto in the
           -------------
performance of any obligation of this Agreement shall be deemed a breach of this
Agreement nor create any liability if the same shall arise from any cause or
causes beyond the control of the parties, including but not limited to the
following which, for the purposes of this Agreement, shall be regarded as beyond
the control of the party in question:  acts of God, acts or omissions of any
government or any rules, regulations or orders of any governmental authority or
any officer, department, agency or instrument thereof; fire, storm, flood,
earthquake, accident, acts of the public enemy, war, rebellion, Internet brown
out, insurrection, riot, invasion, strikes, or lockouts.

     11.6  Notices.  All notices, demands and other communications provided for
           -------
or permitted hereunder shall be made in writing and shall be by registered or
certified first-class mail, return receipt requested, telecopier, courier
service or personal delivery:

                                       26
<PAGE>

          If to DoubleClick prior to December 3, 1999, to:

          DoubleClick Inc.
          41 Madison Avenue
          New York, NY  10010
          Attention:  Chief Executive Officer
          Telecopier No.:  (212) 889-0029

          With a copy to:

          DoubleClick Inc.
          41 Madison Avenue
          New York, NY  10010
          Attention:  General Counsel
          Telecopier No.:  (212) 497-4397

          If to DoubleClick on or after December 3, 1999, to:

          DoubleClick Inc.
          450 West 33rd Street, 16th Floor
          New York, New York 10001
          Attention: Chief Executive Officer
          Telecopier No.: (212) 287-7999

          With a copy to:

          DoubleClick Inc.
          450 West 33rd Street, 16th Floor
          New York, New York 10001
          Attention: General Counsel
          Telecopier No.: (212) 287-9704

          If to AltaVista Company, to:

          AltaVista Company
          529 Bryant Street
          Palo Alto, California 94301
          Attention: General Manager of AltaVista
          Telecopier No.:  (650) 617-3526

                                       27
<PAGE>

          With a copy to:

          AltaVista Company
          529 Bryant Street
          Palo Alto, California 94301
          Attention: General Counsel
          Telecopier No.:  (650) 617-3526

          If to AV Internet Solutions Ltd., to:

          AV Internet Solutions, Ltd.
          c/o Arthur Cox
          Earlsfort Centre, Earlsfort Terrace
          Dublin 2, Ireland

          or to such other address or attention of such other Person as such
          party shall advise the other party in writing.

All such notices and communications shall be deemed to have been duly given when
delivered by hand, if personally delivered; when delivered by courier, if
delivered by commercial courier service; five (5) business days after being
deposited in the mail, postage prepared, if mailed; and when receipt is
mechanically acknowledged, if telecopied.

     11.7  Entire Agreement.  This Agreement, together with the schedules,
           ----------------
exhibits and addenda hereto, is intended by the parties as a final expression of
their agreement and intended to be a complete and exclusive statement of the
agreement and understanding of the parties hereto in respect of the subject
matter contained herein.  There are no restrictions, promises, warranties or
undertakings, other than those set forth herein.  This Agreement, together with
the schedules, exhibits and addenda hereto, supercedes and terminates all prior
agreements and understandings between the parties with respect to such subject
matter, including, but not limited to the Existing Agreement.

     11.8  Successors and Assigns; Third Party Beneficiaries.  This Agreement
           -------------------------------------------------
shall inure to the benefit of and be binding upon the successors and permitted
assigns of the parties hereto. This Agreement and the rights hereunder are not
transferable without the prior written consent of the non-assigning party;
provided, however, that DoubleClick may assign this Agreement and its rights and
obligations hereunder to (a) a purchaser of substantially all of DoubleClick's
stock or business by sale, merger or otherwise and (b) an Affiliate of
DoubleClick; and provided, further, however, that AltaVista may assign this
Agreement and its rights and obligations hereunder to (a) a Person who acquires
the Web Site or the Web Site's assets or business, by sale, merger or otherwise
or (b) an Affiliate of AltaVista. AltaVista further covenants that it shall not
in any circumstance transfer the Web Site or its business involving the Web Site
to any Affiliate or third party, without also assigning to such Affiliate or
third party (if approved by DoubleClick) AltaVista's rights and obligations
under this Agreement. Except as provided in Article VII, no Person other than
the parties hereto and their successors and permitted assigns is intended to be
a beneficiary of this Agreement. No assignment to any permitted assign shall be
effective until

                                       28
<PAGE>

such permitted assign agrees in writing to be bound by and comply with the terms
of this Agreement.

     11.9  Amendment and Waiver.  No failure or delay on the part of any party
           --------------------
hereto in exercising any right, power or remedy hereunder shall operate as a
waiver thereof, nor shall any single or partial exercise of any such right,
power or remedy preclude any other or further exercise hereof or the exercise of
any other right, power or remedy. The remedies provided herein are cumulative
and are not exclusive of any remedies that may be available to the parties
hereto at law, in equity or otherwise. Any amendment, supplement or modification
of or to any provision of this Agreement, any waiver of any provision of this
Agreement and any consent to any departure by the parties hereto from the terms
of any provision of this Agreement, shall be effective only if it is made or
given in writing and signed by each of the parties hereto.

     11.10  Counterparts.  This Agreement may be executed in any number of
            ------------
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement.

     11.11  Publicity.  None of the parties hereto shall issue a press release
            ---------
or public announcement or otherwise make any disclosure concerning this
Agreement or the terms hereof, without prior approval by the other party hereto
(which approval shall not be unreasonably withheld); provided, however, that
nothing in this Agreement shall restrict any party from disclosing information
(a) that is already publicly available, except as a result of a breach of this
provision by the disclosing party, (b) that is required to be disclosed by law,
provided that if such disclosing party is required to file a copy of this
Agreement with a governmental authority, such party shall seek confidential
treatment to the extent reasonably available and (c) to its attorney's
accountant, consultants and other advisers or restrict AltaVista from disclosing
this Agreement to CMGI, Inc. in accordance with Section 10.1(b) above. Prior to
issuing any press release, public announcement or disclosure, the disclosing
party will deliver a draft of such press release, public announcement or
disclosure to the other party and shall give such party a reasonable opportunity
to comment thereon. Both parties shall each also comply with the following: (i)
disclose Confidential Information only to those of its employees, directors and
advisors who need to know the information; (ii) use its best efforts to
implement compliance procedures within its organization; and (iii) in the event
an authorized or unauthorized disclosure is materially inaccurate or misleading
in any way, promptly release a retraction and correction that has been approved
by the other Party. The foregoing remedies shall be non exclusive and the non-
breaching Party may enforce all its other rights and remedies under this
Agreement and at law and in equity.

                                       29
<PAGE>


Dated:  November 1, 1999.                           Dated:  November 1, 1999


AV INTERNET SOLUTIONS LTD.

Signature:  /s/ Brian Moore
          ---------------------------
Printed Name: Brian Moore

Title:  Director

Dated:  November 1, 1999

                                      30