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                        THREE LANDMARK SQUARE, SUITE 400
                          STAMFORD, CONNECTICUT 06901

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                AMENDED NOTICE OF SPECIAL SHAREHOLDERS' MEETING
                  TO BE HELD AT 10:00 A.M. ON FEBRUARY 2, 2001

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To the Shareholders of @plan.inc:

    This Amended Notice is Hereby Given in respect of the special meeting of
shareholders of @plan.inc to be held at The Westin Stamford Hotel, 1 First
Stamford Place, Stamford, Connecticut 06902, at 10:00 a.m., local time on
February 2, 2001 for the following purposes:

        1. The Merger. To consider and vote upon a proposal to approve the
    Amended and Restated Agreement and Plan of Merger and Reorganization (as
    amended) among DoubleClick Inc., Atlas Merger Sub, Inc., Atlas Acquisition
    Corp. and @plan;

        2. Authority to Adjourn. To grant the @plan board of directors
    discretionary authority to adjourn the special shareholders' meeting to
    solicit additional votes for approval of the Amended and Restated Agreement
    and Plan of Merger and Reorganization (as amended); and

        3. Other Business. To transact such other business as may properly come
    before the special meeting or any adjournment or postponement.

    Only shareholders of record at the close of business on December 19, 2000
are entitled to receive notice of and to vote at the special meeting or any
adjournment or postponement thereof. Holders of shares of @plan's common stock
held of record at the close of business on the record date are entitled to one
vote per share on each matter considered and voted on at the special
shareholders' meeting. The affirmative vote of the holders of a majority of the
outstanding shares of common stock entitled to vote at the special shareholders'
meeting is required to approve the amended and restated merger agreement (as
amended). A list of shareholders as of the record date will be open for
examination during the special shareholders' meeting and at @plan's offices,
Three Landmark Square, Suite 400, Stamford, Connecticut 06901, beginning two
business days after notice of the special shareholders' meeting was first given.

    THE BOARD OF DIRECTORS OF @Plan RECOMMENDS THAT YOU VOTE FOR APPROVAL OF THE
AMENDED AND RESTATED MERGER AGREEMENT (AS AMENDED).

    Your vote is important regardless of the number of shares you own. To ensure
that your shares are represented at the special shareholders' meeting, we urge
you to complete, date and sign your proxy and mail it promptly, whether or not
you plan to attend the special shareholders' meeting in person. You may revoke
your proxy in the manner set forth in the proxy statement/prospectus relating to
the merger, dated December 22, 2000 at any time before it has been voted at the
special shareholders' meeting. You may vote in person at the special
shareholders' meeting even if you have returned a proxy.

                                          By Order of The Board of Directors,


                                          /s/ Mark K. Wright

                                          MARK K. WRIGHT
                                          Chairman

Stamford, Connecticut
January 22, 2001