Document:

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                                                                EXHIBIT 10.16

NEITHER THESE WARRANTS NOR THE SHARES UNDERLYING THESE WARRANTS HAVE BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933 OR THE LAWS OF ANY STATE. THEY MAY
NOT BE SOLD OR OTHERWISE TRANSFERRED UNLESS THEY ARE REGISTERED UNDER SUCH ACT
AND APPLICABLE STATE SECURITIES LAWS OR THE COMPANY HAS RECEIVED THE OPINION OF
COUNSEL REASONABLY SATISFACTORY TO IT TO THE EFFECT THAT AN EXEMPTION FROM
REGISTRATION IS AVAILABLE.

15,384 Warrants                                                December 18, 1997

                                 INTRALINKS INC.

                               WARRANT CERTIFICATE

            This warrant certificate ("Warrant Certificate") certifies that for
value received, Landwell Financial Services, Inc. or its assigns or designees
(the "Holder") is the owner of the number of warrants ("Warrants") specified
above, each of which entitles the Holder thereof to purchase, at the time
specified herein but in any event no later than the close of business on or
before December 18, 2005 (the "Final Expiration Date") one fully paid and
non-assessable share of Common Stock, $.01 par value ("Common Stock"), of
IntraLinks Inc., a Delaware corporation (the "Company"), at the Exercise Price
(as hereinafter defined) per share of Common Stock in lawful money of the United
States of America in cash or by certified or cashier's check or a combination of
cash and certified or cashier's check (subject to adjustment as hereinafter
provided).

      1.    Warrant; Exercise Event

            Each Warrant shall entitle the Holder to purchase one Warrant Share
(as hereinafter defined) of the Company upon the occurrence of an Exercise
Event. An "Exercise Event" is herein defined as the earlier to occur of (i) the
consummation by the Company of an equity financing in which the Company receives
gross proceeds of at least $3,000,000 (the "Subsequent Financing"); (ii) the
Company's initial public offering of its securities ("IPO"); or (iii) a Change
in Control of the Company. A "Change in Control" means an event or series of
events as a result of which (i) any "person" or "group" (as such terms are used
in Sections 13(d) or 14(d) of the Securities Exchange Act of 1934, as amended
(the "Exchange Act")) who is not currently a shareholder of the Company acquires
"beneficial ownership" (as determined in accordance with Rule 13d-3 under the
Exchange Act), directly or indirectly, of more than 50% of the total voting
power of the outstanding Voting Stock (as defined below) of the Company;
provided, however, that any such person or group shall not be deemed to be the
beneficial owner of, or to beneficially own, any Voting Stock tendered in a
tender or exchange offer until such Voting Stock is accepted for purchase or
exchange under such tender or exchange offer. For purposes hereof,
<PAGE>

Voting Stock means stock of any class or classes (or equivalent interests) if
the holders of the stock of such class or classes (or equivalent interests) are
ordinarily, in the absence of contingencies, entitled to vote for the election
of a majority of the directors (or Persons (as defined herein) performing
similar functions) of the corporation, association or other such business entity
involved, even though the right so to vote has been suspended by the happening
of a contingency. Persons means any individual, corporation, partnership, trust,
unincorporated association, business, or other legal entity, and any government
or any governmental agency or political subdivision thereof. The shares of
Common Stock issuable upon exercise of the Warrants (and/or other shares of
Common Stock so issuable by reason of any adjustments pursuant to Section 7) are
sometimes referred to herein as the "Warrant Shares."

      2.    Exercise Price

            The exercise price payable upon exercise of the Warrants (the
"Exercise Price") shall be (i) if exercised upon consummation of the Subsequent
Financing, equal to a ten percent (10%) discount to the purchase price per share
of the Company's Common Stock, or equivalent share, purchased in the Subsequent
Financing; (ii) if exercised upon the IPO, equal to a ten percent (10%) discount
to the purchase price per share of the shares of the Company's Common Stock, or
equivalent shares, sold in the IPO; and (iii) if exercised upon a Change in
Control, equal to $6.50 per share, as adjusted pursuant to Section 7 hereof.

      3.    Manner of Exercise; Expiration

            The Company shall provide the Holder with Notice of an Exercise
Event at least ten (10) days before the occurrence of the Exercise Event
("Exercise Event Notice"). The Warrants will be exercisable, at the option of
the Holder, in whole or in part at any time from the time the Holder receives
the Exercise Event Notice until 12:00 p.m. on the day of the Exercise Event
("Expiration Time") and upon surrender of this Warrant Certificate to the
Company, together with a duly completed Notice of Exercise in the form attached
hereto as Exhibit A, and payment of an amount equal to the Exercise Price times
the number of Warrants to be exercised. These Warrants will expire at the
Expiration Time. In the case of exercise of less than all the Warrants
represented by this Warrant Certificate, the Holder shall forfeit the balance of
such Warrants. If an Exercise Event does not occur on or prior to the Final
Expiration Date, this Warrant shall expire on the Final Expiration Date and the
Holder shall have no rights hereunder.

                                     - 2 -
<PAGE>

      4.    Registration and Transfer on Company Books

            4.1 The Company shall maintain books for the registration and
transfer of the Warrants and the registration and transfer of the Warrant
Shares.

            4.2 Prior to due presentment for registration of transfer of this
Warrant Certificate or the Warrant Shares, the Company may deem and treat the
registered Holder as the absolute owner thereof.

            4.3 The Company shall register upon its books any transfer of a
Warrant Certificate upon surrender of same to the Company with a written
instrument of transfer duly executed by the registered Holder or by a duly
authorized attorney. Upon any such registration of transfer, new Warrant
Certificate(s) shall be issued to the transferee(s) and the surrendered Warrant
Certificate shall be canceled by the Company. A Warrant Certificate may also be
exchanged, at the option of the Holder, for new Warrant Certificates of
different denominations representing in the aggregate the number of Warrants
evidenced by the Warrant Certificate surrendered.

      5.    Reservation of Shares

            The Company covenants that it will at all times reserve and keep
available out of its authorized capital stock, solely for the purpose of issue
upon exercise of the Warrants, such number of shares of Common Stock as shall
then be issuable upon the exercise of all outstanding Warrants. The Company
covenants that all Warrant Shares shall be duly and validly issued and fully
paid and non-assessable and free from all taxes, liens and charges with respect
to the issue thereof and that upon issuance, such Warrant Shares shall be listed
on each national securities exchange, if any, on which the other shares of such
outstanding capital stock of the Company are then listed.

      6.    Loss or Mutilation

            Upon receipt by the Company of reasonable evidence of the ownership
of and the loss, theft, destruction or mutilation of any Warrant Certificate
and, in the case of loss, theft or destruction, an indemnity reasonably
satisfactory to the Company, or, in the case of mutilation, upon surrender and
cancellation of the mutilated Warrant Certificate, the Company shall execute and
deliver in lieu thereof a new Warrant Certificate representing an equal number
of Warrants.

                                     - 3 -
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      7.    Adjustment of Exercise Price and Number of Shares Deliverable

            7.1 The number of Warrant Shares purchasable upon the exercise of
each Warrant and the Exercise Price with respect to the Warrant Shares shall be
subject to adjustment as follows:

                  (a) In case the Company shall (i) declare a dividend or make a
      distribution on its Common Stock payable in shares of its capital stock,
      (ii) subdivide its outstanding shares of Common Stock through stock split
      or otherwise, (iii) combine its outstanding shares of Common Stock into a
      smaller number of shares of Common Stock, or (iv) issue by
      reclassification of its Common Stock (including any such reclassification
      in connection with a consolidation or merger in which the Company is the
      continuing corporation) other securities of the Company, the number and/or
      nature of Warrant Shares purchasable upon exercise of each Warrant
      immediately prior thereto shall be adjusted so that the Holder shall be
      entitled to receive the kind and number of Warrant Shares or other
      securities of the Company which he would have owned or have been entitled
      to receive after the happening of any of the events described above had
      such Warrant been exercised immediately prior to the happening of such
      event or any record date with respect thereto. An adjustment made pursuant
      to this Paragraph (a) shall become effective retroactively as of the
      record date of such event.

                  (b) In the event of any capital reorganization or any
      reclassification of the capital stock of the Company or in case of the
      consolidation or merger of the Company with another corporation (other
      than a consolidation or merger in which the outstanding shares of the
      Company's Common Stock are not converted into or exchanged for other
      rights or interests), or in the case of any sale, transfer or other
      disposition to another corporation of all or substantially all the
      properties and assets of the Company, the Holder of each Warrant shall
      thereafter be entitled to purchase (and it shall be a condition to the
      consummation of any such reorganization, reclassification, consolidation,
      merger, sale, transfer or other disposition that appropriate provisions
      shall be made so that such Holder shall thereafter be entitled to
      purchase) the kind and amount of shares of stock and other securities and
      property (including cash) which the Holder would have been entitled to
      receive had such Warrants been exercised immediately prior to the
      effective date of such reorganization, reclassification, consolidation,
      merger, sale, transfer or other disposition; and in any such case,
      appropriate adjustments shall be made in the application of the provisions
      of this Section 7 with respect to rights and interest thereafter of the
      Holder of the Warrants so that the provisions of this Section 7 shall
      thereafter be applicable,

                                     - 4 -
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      as near as reasonably may be, in relation to any shares or other property
      thereafter purchasable upon the exercise of the Warrants. The provisions
      of this Section 7.1(b) shall similarly apply to successive
      reorganizations, reclassifications, consolidations, mergers, sales,
      transfers or other dispositions.

                  (c) Whenever the number of Warrant Shares purchasable upon the
      exercise of each Warrant is adjusted, as provided in this Section 7.1, the
      Exercise Price with respect to the Warrant Shares shall be adjusted by
      multiplying such Exercise Price immediately prior to such adjustment by a
      fraction, of which the numerator shall be the number of Warrant Shares
      purchasable upon the exercise of each Warrant immediately prior to such
      adjustment, and of which the denominator shall be the number of Warrant
      Shares so purchasable immediately thereafter.

            7.2 No adjustment in the number of Warrant Shares purchasable under
the Warrants, or in the Exercise Price with respect to the Warrant Shares, shall
be required unless such adjustment would require an increase or decrease of at
least 1% in the number of Warrant Shares issuable upon the exercise of such
Warrant, or in the Exercise Price thereof; provided, however, that any
adjustments which by reason of this Section 7.2 are not required to be made
shall be carried forward and taken into account in any subsequent adjustment.

            7.3 Whenever the number of Warrant Shares purchasable upon the
exercise of each Warrant or the Exercise Price of such Warrant Shares is
adjusted, as herein provided, the Company shall mail to the Holder, at the
address of the Holder shown on the books of the Company, a notice of such
adjustment or adjustments, prepared and signed by an officer of the Company,
which sets forth the number of Warrant Shares purchasable upon the exercise of
each Warrant and the Exercise Price of such Warrant Shares after such
adjustment, and a brief, statement of the facts requiring such adjustment.

            7.4 The form of Warrant Certificate need not be changed because of
any change in the Exercise Price, the number of Warrant Shares issuable upon the
exercise of a Warrant or the number of Warrants outstanding pursuant to this
Section 7, and Warrant Certificates issued before or after such change may state
the same Exercise Price, the same number of Warrants and the same number of
Warrant Shares issuable upon exercise of Warrants as are stated in the Warrant
Certificates theretofore issued pursuant to this Agreement. The Company may,
however, at any time, in its sole discretion, make any change in the form of
Warrant Certificate that it may deem appropriate and that does not affect the
substance thereof, and any Warrant Certificates thereafter issued or
countersigned, whether in exchange or substitution for an

                                     - 5 -
<PAGE>

outstanding Warrant Certificate or otherwise, may be in the form as so changed.

      8.    Voluntary Adjustment by the Company

            The Company may, at its option, at any time during the term of the
Warrants, extend the date of the expiration of the Warrants.

      9.    Fractional Shares and Warrants; Determination of Market Price Per
            Share

            9.1 Anything contained herein to the contrary notwithstanding, the
Company shall not be required to issue any fraction of a share of Common Stock
in connection with the exercise of Warrants. Warrants may not be exercised in
such number as would result (except for the provisions of this paragraph) in the
issuance of a fraction of a share of Common Stock unless the Holder is
exercising all Warrants then owned by the Holder. In such event, the Company
shall, upon the exercise of all of such Warrants, issue to the Holder the
largest aggregate whole number of shares of Common Stock called for thereby upon
receipt of the Exercise Price for all of such Warrants and pay a sum in cash
equal to the remaining fraction of a share of Common Stock, multiplied by its
Market Price Per Share (as determined pursuant to Section 9.2 below) as of the
last business day preceding the date on which the Warrants are presented for
exercise.

            9.2 As used herein, the "Market Price Per Share" with respect to any
class or series of Common Stock on any date shall mean the closing price per
share of such class or series of Common Stock for the trading day immediately
preceding such date. The closing price for each such day shall be the last sale
price regular way or, in case no such sale takes place on such day, the average
of the closing bid and asked prices regular way, in either case on the principal
securities exchange on which the shares of such Common Stock of the Company are
listed or admitted to trading, the last sale price, or in case no sale takes
place on such day, the average of the closing bid and asked prices of such
Common Stock on NASDAQ or any comparable system, or if such Common Stock is not
reported on NASDAQ or a comparable system, the average of the closing bid and
asked prices as furnished by two members of the National Association of
Securities Dealers, Inc. selected from time to time by the Company for that
purpose. If such bid and asked prices are not available, then "Market Price Per
Share" shall be equal to the fair market value of such Common Stock as
determined in good faith by the Board of Directors of the Company.

                                     - 6 -
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      10.   Issue Tax

            The issuance of certificates for shares of Common Stock upon
exercise of the Warrants shall be made without charge to the holders of such
Warrants for any issuance tax in respect thereof provided that the Company shall
not be required to pay any tax which may be payable in respect of any transfer
involved in the issuance and delivery of any certificate in a name other than
that of any holder of the Warrants.

      11.   Registration Rights

            The rights of the holder hereof with respect to the registration
under the Securities Act of 1933, as amended, of the Warrant Shares are set
forth in the Registration Rights Agreement, of even date herewith by and among
the Company and the several parties to such agreement.

      12.   Governing Law

            This Warrant Certificate shall be governed by and construed in
accordance with the laws of the State of Delaware.

            IN WITNESS WHEREOF, the Company has caused this Warrant Certificate
to be duly executed by its officers thereunto duly authorized and its corporate
seal to be affixed hereon, as of this 18th day of December, 1997.

[SEAL]                                     INTRALINKS INC.

                                           By:
                                               ---------------------------
                                               Name:
                                               Title:

                                     - 7 -
<PAGE>

                                                                       EXHIBIT A

                               NOTICE OF EXERCISE

            The undersigned hereby irrevocably elects to exercise, pursuant to
Section 3 of the Warrant Certificate accompanying this Notice of Exercise,
_______ Warrants of the total number of Warrants owned by the undersigned
pursuant to the accompanying Warrant Certificate, and herewith makes payment of
the Exercise Price of such shares in full.

                                     ---------------------------------------
                                     Name of Holder

                                     ---------------------------------------
                                     Signature

                                     Address:

                                     ---------------------------------------

                                     ---------------------------------------

                                     ---------------------------------------

                                     - 8 -<PAGE>

                                                                 EXHIBIT 10.17

                              Warrant Certificate

          NEITHER THESE WARRANTS NOR THE SHARES UNDERLYING THESE
          WARRANTS HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF
          1933 OR THE LAWS OF ANY STATE. THEY MAY NOT BE SOLD OR
          OTHERWISE TRANSFERRED UNLESS THEY ARE REGISTERED UNDER SUCH
          ACT AND APPLICABLE STATE SECURITIES LAWS OR AN EXEMPTION
          FROM REGISTRATION IS AVAILABLE. THESE WARRANTS AND THE
          SHARES UNDERLYING THESE WARRANTS ARE ALSO SUBJECT TO
          ADDITIONAL RESTRICTIONS ON TRANSFER SET FORTH IN THE
          PURCHASE AGREEMENT OF EVEN DATE HEREWITH, A COPY OF WHICH
          MAY BE OBTAINED FROM INTRALINKS INC.

                                                            27,000 Warrants

                                INTRALINKS INC.

                              WARRANT CERTIFICATE

          This warrant certificate ("Warrant Certificate") certifies that for
value received, Perseus Capital, LLC or registered assigns (the "Holder") is the
owner of the number of warrants ("Warrants") specified above, each of which
entitles the Holder thereof to purchase, at any time on or before the Expiration
Date (hereinafter defined) one fully paid and non-assessable share of the Series
B Preferred Stock, par value $0.01 per share ("Series B Preferred Stock"), of
IntraLinks Inc., a Delaware corporation (the "Company"), at a purchase price per
share of Series B Preferred Stock as set forth herein in lawful money of the
United States of America in cash or by certified or cashier's check.

     1.   Warrant; Purchase Price
          -----------------------

          Each Warrant shall entitle the Holder initially to purchase one share
of Series B Preferred Stock of the Company and the purchase price per share of
Series B Preferred Stock payable upon exercise of the Warrants (the "Purchase
Price") shall initially be $6.50; provided, however, that in the event of an
adjustment to the conversion price of the Series B Preferred Stock pursuant to
the Series B Preferred Stock Certificate of Designation dated December 17, 1997,
as amended, the Purchase Price shall be similarly adjusted.  The Purchase Price
and number of shares of Series B Preferred Stock issuable upon exercise of each
Warrant are subject to adjustment as provided in Article 6.  The shares of
Series B Preferred Stock issuable upon exercise of the Warrants (and/or other
shares of Series B Preferred Stock so issuable by reason of any adjustments
pursuant to Article 6) are sometimes referred to herein as the "Warrant Shares."
<PAGE>

     2.   Exercise; Expiration Date
          -------------------------

          2.1  The Warrants are exercisable, at the option of the Holder, in
whole or in part at any time and from time to time after issuance and on or
before the Expiration Date, upon surrender of this Warrant Certificate to the
Company together with a duly completed Notice of Exercise, in the form attached
hereto as Exhibit A, and payment of an amount equal to the Purchase Price times
          ---------
the number of Warrants to be exercised.  In the case of exercise of less than
all the Warrants represented by this Warrant Certificate, the Company shall
cancel the Warrant Certificate upon the surrender thereof and shall execute and
deliver a new Warrant Certificate for the balance of such Warrants.

          2.2  The term "Expiration Date" shall mean 5:00 p.m. New York time
five (5) years from the date hereof, or if such day shall in the State of New
York be a holiday or a day on which banks are authorized to close, then 5:00
p.m. New York time the next following day which in the State of New York is not
a holiday or a day on which banks are authorized to close.

     3.   Registration and Transfer on Company Books
          ------------------------------------------

          3.1  The Company shall maintain books for the registration and
transfer of the Warrants and the registration and transfer of the Warrant
Shares.

          3.2  Prior to due presentment for registration of transfer of this
Warrant Certificate, or the Warrant Shares, the Company may deem and treat the
registered Holder as the absolute owner thereof.

          3.3  The Company shall register upon its books any permitted transfer
of a Warrant Certificate, upon surrender of same to the Company with a written
instrument of transfer duly executed by the registered Holder or by a duly
authorized attorney.  Upon any such registration of transfer, new Warrant
Certificate(s) shall be issued to the transferee(s) and the surrendered Warrant
Certificate shall be canceled by the Company.  A Warrant Certificate may also be
exchanged, at the option of the Holder, for new Warrant Certificates of
different denominations representing in the aggregate the number of Warrants
evidenced by the Warrant Certificate surrendered.

     4.   Reservation of Shares
          ---------------------

          The Company covenants that it will as promptly as practicable
following the date of this Warrant, reserve and keep available out of its
authorized capital stock, solely for the purpose of issue upon exercise of the
Warrants, such number of shares of Series B Preferred Stock as shall then be
issuable upon the exercise of all outstanding Warrants.  The Company covenants
that all shares of capital stock which shall be issuable upon exercise of the
Warrants shall, at the time of such exercise, be duly and validly issued and
fully paid and non-assessable and free from all taxes, liens and charges with
respect to the issue thereof, and that upon

                                      -2-
<PAGE>

issuance such shares shall be listed on each national securities exchange, if
any, on which the other shares of such outstanding capital stock of the Company
are then listed.

     5.   Loss or Mutilation
          ------------------

          Upon receipt by the Company of reasonable evidence of the ownership of
and the loss, theft, destruction or mutilation of any Warrant Certificate and,
in the case of loss, theft or destruction, of indemnity reasonably satisfactory
to the Company, or, in the case of mutilation, upon surrender and cancellation
of the mutilated Warrant Certificate, the Company shall execute and deliver in
lieu thereof a new Warrant Certificate representing an equal number of Warrants.

     6    Adjustment of Purchase Price and Number of Shares Deliverable
          -------------------------------------------------------------

          6.1  The number of Warrant Shares purchasable upon the exercise of
each Warrant and the Purchase Price with respect to the Warrant Shares shall be
subject to adjustment as follows:

               (a)  In case the Company shall (i) declare a dividend or make a
     distribution on its Series B Preferred Stock payable in shares of its
     capital stock, (ii) subdivide its outstanding shares of Series B Preferred
     Stock through stock split or otherwise, (iii) combine its outstanding
     shares of Series B Preferred Stock into a smaller number of shares of
     Series B Preferred Stock, or (iv) issue by reclassification of its Series B
     Preferred Stock (including any such reclassification in connection with a
     consolidation or merger in which the Company is the continuing corporation)
     other securities of the Company, the number and/or nature of Warrant Shares
     purchasable upon exercise of each Warrant immediately prior thereto shall
     be adjusted so that the Holder shall be entitled to receive the kind and
     number of Warrant Shares or other securities of the Company which he would
     have owned or have been entitled to receive after the happening of any of
     the events described above, had such Warrant been exercised immediately
     prior to the happening of such event or any record date with respect
     thereto.  An adjustment made pursuant to this paragraph (a) shall become
     effective retroactively as of the record date of such event.

               (b)  In the event of any capital reorganization or any
     reclassification of the capital stock of the Company or in case of the
     consolidation or merger of the Company with another corporation (other than
     a consolidation or merger in which the outstanding shares of the Company's
     Series B Preferred Stock are not converted into or exchanged for other
     rights or interests), or in the case of any sale, transfer or other
     disposition to another corporation of all or substantially all the
     properties and assets of the Company, the Holder of each Warrant shall
     thereafter be entitled to purchase (and it shall be a condition to the
     consummation of any such reorganization, reclassification, consolidation,
     merger, sale, transfer or other disposition that appropriate provisions
     shall be made so that such Holder shall thereafter be entitled to purchase)
     the kind and amount of shares

                                      -3-
<PAGE>

     of stock and other securities and property (including cash) which the
     Holder would have been entitled to receive had such Warrants been exercised
     immediately prior to the effective date of such reorganization,
     reclassification, consolidation, merger, sale, transfer or other
     disposition; and in any such case appropriate adjustments shall be made in
     the application of the provisions of this Article 6 with respect to rights
     and interest thereafter of the Holder of the Warrants to the end that the
     provisions of this Article 6 shall thereafter be applicable, as near as
     reasonably may be, in relation to any shares or other property thereafter
     purchasable upon the exercise of the Warrants. The provisions of this
     Section 6.1(b) shall similarly apply to successive reorganizations,
     reclassifications, consolidations, mergers, sales, transfers or other
     dispositions.

               (c)  Whenever the number of Warrant Shares purchasable upon the
     exercise of each Warrant is adjusted, as provided in this Section 6.1, the
     Purchase Price with respect to the Warrant Shares shall be adjusted by
     multiplying such Purchase Price immediately prior to such adjustment by a
     fraction, of which the numerator shall be the number of Warrant Shares
     purchasable upon the exercise of each Warrant immediately prior to such
     adjustment, and of which the denominator shall be the number of Warrant
     Shares so purchasable immediately thereafter.

          6.2  No adjustment in the number of Warrant Shares purchasable under
the Warrants, or in the Purchase Price with respect to the Warrant Shares, shall
be required unless such adjustment would require an increase or decrease of at
least 1% in the number of Warrant Shares issuable upon the exercise of such
Warrant, or in the Purchase Price thereof; provided, however, that any
adjustments which by reason of this Section 6.2 are not required to be made
shall be carried forward and taken into account in any subsequent adjustment.

          6.3  Whenever the number of Warrant Shares purchasable upon the
exercise of each Warrant or the Purchase Price of such Warrant Shares is
adjusted, as herein provided, the Company shall mail to the Holder, at the
address of the Holder shown on the books of the Company, a notice of such
adjustment or adjustments, prepared and signed by an officer of the Company,
which sets forth the number of Warrant Shares purchasable upon the exercise of
each Warrant and the Purchase Price of such Warrant Shares after such
adjustment, and a brief statement of the facts requiring such adjustment.

          6.4  The form of Warrant Certificate need not be changed because of
any change in the Purchase Price, the number of Warrant Shares issuable upon the
exercise of a Warrant or the number of Warrants outstanding pursuant to this
Section 6, and Warrant Certificates issued before or after such change may state
the same Purchase Price, the same number of Warrants, and the same number of
Warrant Shares issuable upon exercise of Warrants as are stated in the Warrant
Certificates theretofore issued pursuant to this Agreement.  The Company may,
however, at any time, in its sole discretion, make any change in the form of
Warrant Certificate that it may deem appropriate and that does not affect the
substance thereof, and any Warrant Certificates thereafter issued or
countersigned, whether in exchange

                                      -4-
<PAGE>

or substitution for an outstanding Warrant Certificate or otherwise, may be in
the form as so changed.

     7.   Conversion Rights.
          -----------------

          In lieu of exercising this Warrant or any portion hereof, the Holder
hereof shall have the right to convert this Warrant or any portion hereof into
Warrant Shares by executing and delivering to the Company at its principal
office the written Notice of Conversion attached hereto as Exhibit B, specifying
                                                           ---------
the portion of the Warrant Shares to be converted and accompanied by this
Warrant.  The number of Warrant Shares to be issued to Holder upon such
conversion shall be computed using the following formula:

                    X=(P)(Y)(A-B)/A

where     X=   the number of Warrant Shares to be issued to the Holder for the
               portion of the Warrant being converted.

          P=   the portion of the Warrant being converted expressed as a decimal
               fraction.

          Y=   the total number of Warrant Shares issuable upon exercise of the
               Warrant in full.

          A=   the fair market value of one Warrant Share shall mean (i) the
               fair market value of one share of the Company's Series B
               Preferred Stock as of the last business day immediately prior to
               the date the notice of conversion is received by the Company, as
               determined in good faith by the Company's Board of Directors, or
               (ii) if this Warrant is being converted in conjunction with a
               public offering of the Company's common stock, par value $.01
               (the "Common Stock"), the price to the public per share of Common
               Stock pursuant to the offering.

          B=   the Purchase Price on the date of conversion.

Any portion of this Warrant that is converted shall be immediately canceled.
This Warrant or any portion hereof shall be deemed to have been converted
immediately prior to the close of business on the date of its surrender for
conversion as provided above, and the person entitled to receive the Warrant
Shares issuable upon such conversion shall be treated for all purposes as Holder
of such shares of record as of the close of business on such date.  As promptly
as practicable after such date, the Company shall issue and deliver to the
person or persons entitled to receive the same a certificate or certificates for
the number of full Warrant Shares issuable upon such conversion.  If the Warrant
shall be converted for less than the total number of Warrant Shares then
issuable upon conversion, promptly after surrender of the Warrant upon such
conversion, the Company will execute and deliver a new Warrant, dated the date
hereof,

                                      -5-
<PAGE>

evidencing the right of the Holder to the balance of the Warrant Shares
purchasable hereunder upon the same terms and conditions set forth herein.

     8.   Voluntary Adjustment by the Company
          -----------------------------------

          The Company may, at its option, at any time during the term of the
Warrants, reduce the then current Purchase Price to any amount deemed
appropriate by the Board of Directors of the Company and/or extend the date of
the expiration of the Warrants.

     9.   Fractional Shares and Warrants;
          Determination of Market Price Per Share
          ---------------------------------------

          9.1  Anything contained herein to the contrary notwithstanding, the
Company shall not be required to issue any fraction of a share of Series B
Preferred Stock in connection with the exercise of Warrants.  Warrants may not
be exercised in such number as would result (except for the provisions of this
paragraph) in the issuance of a fraction of a share of Series B Preferred Stock
unless the Holder is exercising all Warrants then owned by the Holder.  In such
event, the Company shall, upon the exercise of all of such Warrants, issue to
the Holder the largest aggregate whole number of shares of Series B Preferred
Stock called for thereby upon receipt of the Purchase Price for all of such
Warrants and pay a sum in cash equal to the remaining fraction of a share of
Series B Preferred Stock, multiplied by its Market Price Per Share (as
determined pursuant to Section 9.2 below) as of the last business day preceding
the date on which the Warrants are presented for exercise.

          9.2  As used herein, the "Market Price Per Share" with respect to any
share of stock on any specified date shall mean the closing price per share of
such stock for the trading day immediately preceding such date.  The closing
price for each such day shall be the last sale price regular way or, in case no
such sale takes place on such day, the average of the closing bid and asked
prices regular way, in either case on the principal securities exchange on which
the shares of such stock of the Company are listed or admitted to trading, the
last sale price, or in case no sale takes place on such day, the average of the
closing bid and asked prices of such stock on NASDAQ or any comparable system,
or if such stock is not reported on NASDAQ, or a comparable system, the average
of the closing bid and asked prices as furnished by two members of the National
Association of Securities Dealers, Inc. selected from time to time by the
Company for that purpose.  If such bid and asked prices are not available, then
"Market Price Per Share" shall be equal to the fair market value of such stock
as determined in good faith by the Board of Directors of the Company.

     10.  Restriction Upon Transfer; Securities Law Matters.
          -------------------------------------------------

THESE WARRANTS MAY NOT BE SOLD, TRANSFERRED OR OTHERWISE DISPOSED OF BY THE
HOLDER, EXCEPT AS SPECIFICALLY PROVIDED IN THE PURCHASE AGREEMENT OF EVEN DATE
HEREWITH BETWEEN THE COMPANY AND THE HOLDER.  THESE WARRANTS HAVE NOT BEEN
REGISTERED UNDER THE

                                      -6-
<PAGE>

SECURITIES ACT OF 1933, AS AMENDED, OR STATE SECURITIES LAWS AND MAY NOT BE
SOLD, ASSIGNED OR TRANSFERRED UNLESS SUCH SALE, ASSIGNMENT OR TRANSFER OF THESE
WARRANTS IS REGISTERED UNDER THE ACT AND APPLICABLE STATE SECURITIES LAWS OR
UNLESS AN EXEMPTION FROM REGISTRATION IS AVAILABLE.

        11.     Governing Law
                -------------

                This Warrant Certificate shall be governed by and construed in
accordance with the laws of the State of Delaware.

        12.     Issue Tax
                ---------

                The issuance of Warrant Shares upon exercise of the Warrants
shall be made without charge to the holders of such Warrants for any issuance
tax in respect thereof provided that the Company shall not be required to pay
any tax which may be payable in respect of any transfer involved in the issuance
and delivery of any certificate in a name other than that of any holder of the
Warrants.

        13.     Registration Rights
                -------------------

                The rights of the holder hereof with respect to registration
under the Securities Act of 1933, as amended, of the Warrant Shares are set
forth in the Registration Rights Agreement dated as of December 18, 1997 by and
among the Company and the several parties to such agreement.

                                      -7-

<PAGE>

        IN WITNESS WHEREOF, the Company has caused this Warrant Certificate to
be duly executed by its officers thereunto duly authorized and its corporate
seal to be affixed hereon, as of this 20th day of August, 1998.

                                        INTRALINKS INC.

                                        By:
                                            ---------------------------
                                            Name:
                                            Title:
<PAGE>

                                                                       EXHIBIT A

                              NOTICE OF EXERCISE

        The undersigned hereby irrevocably elects to exercise, pursuant to
Section 2 of the Warrant Certificate accompanying this Notice of Exercise, _____
Warrants of the total number of Warrants owned by the undersigned pursuant to
the accompanying Warrant Certificate, and herewith makes payment of the Purchase
Price of such shares in full.

                                ______________________
                                Name of Holder

                                /s/
                                ______________________
                                Signature

                                Address:

                                ______________________

                                ______________________

                                ______________________
<PAGE>

                                                                       EXHIBIT B

                             NOTICE OF CONVERSION

The undersigned hereby irrevocably elects to convert, pursuant to Section 7 of
the Warrant Certificate accompanying this Notice of Conversion,_______ Warrants
of the total number of Warrants owned by the undersigned pursuant to the
accompanying Warrant Certificate into shares of the Series B Preferred Stock of
the Company (the "Shares").

The numnber of Shares to be received by the undersigned shall be calculated in
accordance with the provisions of Section 7 of the accompanying Warrant
Certificate.

                                ____________________
                                Name of Holder

                                /s/
                                ____________________
                                Signature

                                Address:

                                ____________________

                                ____________________

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