ALLAIRE CORP
S-1/A, 1999-09-24
PREPACKAGED SOFTWARE
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<PAGE>
   AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON SEPTEMBER 24, 1999

                                                      REGISTRATION NO. 333-86563
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------

                               AMENDMENT NO. 2 TO
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------

                              ALLAIRE CORPORATION
             (Exact name of registrant as specified in its charter)

<TABLE>
<S>                                       <C>                                       <C>
                DELAWARE                                    7372                                   41-1830792
      (State or other jurisdiction              (Primary Standard Industrial                    (I.R.S. Employer
   of incorporation or organization)            Classification Code Number)                  Identification Number)
</TABLE>

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

                               ONE ALEWIFE CENTER
                         CAMBRIDGE, MASSACHUSETTS 02140
                                 (617) 761-2000
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)

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

                                 DAVID J. ORFAO
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                              ALLAIRE CORPORATION
                               ONE ALEWIFE CENTER
                         CAMBRIDGE, MASSACHUSETTS 02140
                                 (617) 761-2000
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

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

                                   COPIES TO:

<TABLE>
<S>                                           <C>
          ROBERT L. BIRNBAUM, ESQ.                   WILLIAM J. SCHNOOR, JR., ESQ.
           WILLIAM R. KOLB, ESQ.                        BRIAN D. GOLDSTEIN, ESQ.
         RICHARD G. COSTELLO, ESQ.                  TESTA, HURWITZ & THIBEAULT, LLP
          FOLEY, HOAG & ELIOT LLP                           125 High Street
           One Post Office Square                     Boston, Massachusetts 02110
        Boston, Massachusetts 02109                          (617) 248-7000
               (617) 832-1000
</TABLE>

    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: As soon as
practicable after this Registration Statement becomes effective.

    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, check the following box. / /

    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. / /

    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /

    If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /

    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. / /
                            ------------------------

    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
                            ------------------------

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>
    Part I of the Registration Statement has been intentionally omitted because
this Amendment No. 2 does not effect any changes to the Prospectus. The sole
purpose of this Amendment No. 2 is to file Exhibits 1.1 and 5.1.
<PAGE>
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 13. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

    The following table sets forth the various expenses in connection with the
issuance and distribution of the securities being registered. All amounts shown
are estimates except the Securities and Exchange Commission registration fee,
the National Association of Securities Dealers, Inc. filing fee and the Nasdaq
National Market listing fee.

<TABLE>
<CAPTION>
                                                                                             PAYABLE
                                                                                              BY THE
                                                                                             COMPANY
                                                                                            ----------
<S>                                                                                         <C>
Securities and Exchange Commission registration fee.......................................  $   37,784
National Association of Securities Dealers, Inc. filing fee...............................      14,092
Nasdaq National Market listing fee........................................................      17,500
Printing and engraving expenses...........................................................     100,000
Transfer agent fees.......................................................................       5,000
Accounting fees and expenses..............................................................      75,000
Legal fees and expenses...................................................................     225,000
Blue Sky fees and expenses (including related legal fees).................................       5,000
Miscellaneous.............................................................................      20,624
                                                                                            ----------
Total.....................................................................................  $  500,000
                                                                                            ----------
                                                                                            ----------
</TABLE>

ITEM 14. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

    Section 145 of the Delaware General Corporation Law affords a Delaware
corporation the power to indemnify its present and former directors and officers
under certain conditions. Article Sixth of the Certificate provides that Allaire
shall indemnify each person who at any time is, or shall have been, a director
or officer of Allaire and was or is a party or is threatened to be made a party
to any threatened, pending or completed action, suit or proceeding, whether
civil, criminal, administrative or investigative, by reason of the fact that he
or she is or was a director or officer of Allaire, or is or was serving at the
request of Allaire as a director, officer, trustee of, or in a similar capacity
with, another corporation, partnership, joint venture, trust or other
enterprise, against expenses (including attorneys' fees), judgments, fines and
amounts paid in settlement incurred in connection with any such action, suit or
proceeding, to the maximum extent permitted by the Delaware General Corporation
Law, as the same exists or may hereafter be amended. No amendment to or repeal
of the provisions of Article Sixth of the Certificate shall deprive a director
or officer of the benefit thereof with respect to any act or failure occurring
prior to such amendment or repeal.

    Section 102(b)(7) of the Delaware General Corporation Law gives a Delaware
corporation the power to adopt a charter provision eliminating or limiting the
personal liability of directors to the corporation or its stockholders for
breach of fiduciary duty as directors, provided that such provision may not
eliminate or limit the liability of directors for (i) any breach of the
director's duty of loyalty to the corporation or its stockholders, (ii) any acts
or omissions not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) any payment of a dividend or approval of a stock
purchase that is illegal

                                      II-1
<PAGE>
under Section 174 of the Delaware General Corporation Law or (iv) any
transaction from which the director derived an improper personal benefit.
Article Seventh of the Certificate provides that to the maximum extent permitted
by the Delaware General Corporation Law, no director of Allaire shall be
personally liable to Allaire or to any of its stockholders for monetary damages
arising out of such director's breach of fiduciary duty as a director of
Allaire. No amendment to or repeal of the provisions of Article Seventh shall
apply to or have any effect on the liability or the alleged liability of any
director of Allaire with respect to any act or failure to act of such director
occurring prior to such amendment or repeal. A principal effect of such Article
Seventh is to limit or eliminate the potential liability of Allaire's directors
for monetary damages arising from breaches of their duty of care, unless the
breach involves one of the four exceptions described in (i) through (iv) above.

    Section 145 of the Delaware General Corporation Law also affords a Delaware
corporation the power to obtain insurance on behalf of its directors and
officers against liabilities incurred by them in those capacities. Allaire has
procured a directors' and officers' liability and company reimbursement
liability insurance policy that (a) insures directors and officers of Allaire
against losses (above a deductible amount) arising from certain claims made
against them by reason of certain acts done or attempted by such directors or
officers and (b) insures Allaire against losses (above a deductible amount)
arising from any such claims, but only if Allaire is required or permitted to
indemnify such directors or officers for such losses under statutory or common
law or under provisions of its Amended and Restated Certificate of Incorporation
or its By-Laws.

ITEM 15. RECENT SALES OF UNREGISTERED SECURITIES.

    The following information is furnished with regard to all securities sold by
Allaire since February 1996 which were not registered under the Securities Act.

    (A) ISSUANCES OF COMMON STOCK BY ALLAIRE MINNESOTA.

    From February 1996 through January 1997, Allaire Corp., a Minnesota
corporation ("Allaire Minnesota"), issued and sold an aggregate of 2,000,000
shares of its Common Stock for consideration valued at $51,690.

    (B) ISSUANCES OF PREFERRED STOCK BY ALLAIRE MINNESOTA.

    From June 1996 through March 1997, Allaire Minnesota issued and sold an
aggregate of 56,557 shares of its Series A Convertible Preferred Stock, for
aggregate consideration of $255,165. From June 1996 through March 1997, Allaire
Minnesota also issued and sold an aggregate of 514,306 shares of its Series B
Convertible Preferred Stock, for aggregate consideration of $2,324,664. In
December 1996, Allaire Minnesota issued and sold an aggregate of 84,600 shares
of its Series C Preferred Stock, for aggregate consideration of $499,986.

    (C) GRANTS AND EXERCISES OF ALLAIRE MINNESOTA'S STOCK OPTIONS.

    From June 1996 through April 1997, Allaire Minnesota issued options to
purchase an aggregate of 1,086,800 shares of its Common Stock, and sold 1,250
shares of its Common Stock pursuant to the exercise of such options for
aggregate consideration of $1,250.

                                      II-2
<PAGE>
    On April 25, 1997 Allaire Minnesota was reincorporated as a Delaware
corporation through the merger of Allaire Minnesota into Allaire. Pursuant to
the reincorporation merger, each share of Common Stock of Allaire Minnesota was
automatically changed and converted into two shares of Common Stock of Allaire.
Each share of Series A, B and C Convertible Preferred Stock of Allaire Minnesota
was automatically changed and converted into one share of the corresponding
series of Allaire's Convertible Preferred Stock. Each share of Allaire's Series
A, B and C Convertible Preferred Stock issued pursuant to the reincorporation
merger automatically changed and converted into two shares of Allaire's Common
Stock upon the closing of Allaire's initial public offering in January 1999.
Also pursuant to the reincorporation merger, each option to purchase one share
of Common Stock of Allaire Minnesota was automatically converted and changed
into an option to purchase two shares of Allaire's Common Stock.

    (D) ISSUANCES OF COMMON STOCK BY ALLAIRE.

    From January 1998 through April 22, 1999, Allaire issued and sold 1,438,019
shares of its Common Stock for aggregate consideration of $546,245.

    In April 1999, in order to acquire Bright Tiger Technologies Inc., Allaire
issued and sold 288,583 shares of its Common Stock.

    In June 1999, in order to acquire Live Software, Inc., Allaire issued and
sold 528,376 shares of its Common Stock.

    (E) ISSUANCES OF PREFERRED STOCK BY ALLAIRE

    On December 7, 1998, Allaire issued and sold 31,250 shares of Series A
Convertible Preferred Stock for aggregate consideration of $500,000. Each of
these 31,250 shares of Series A Convertible Stock automatically changed and
converted into one share of Allaire's Common Stock upon the closing of Allaire's
initial public offering.

    In February 1998, Allaire issued and sold 656 shares of Series A Convertible
Preferred Stock, for aggregate consideration of $5,250. Each of these 656 shares
of Series A Convertible Preferred Stock automatically changed and converted into
one share of Allaire's Common Stock upon the closing of Allaire's initial public
offering. In May and June 1997, Allaire issued and sold 2,336,909 shares of
Series D Convertible Preferred Stock, for aggregate consideration of $9,347,636.
Each share of Series D Convertible Preferred Stock automatically changed and
converted into one share of the Company Common Stock upon the closing of
Allaire's initial public offering.

    (F) GRANTS OF ALLAIRE'S STOCK OPTIONS.

    From April 1997 through April 22, 1999, Allaire granted options to purchase
an aggregate of 1,911,610 shares of its Common Stock, exercisable at a weighted
average exercise price of $15.17 per share.

    The issuances described in this Item 15 were made in reliance upon the
exemption from registration set forth in Section 4(2) of the Securities Act
relating to sales by an issuer not involving any public offering. None of the
foregoing transactions involved a distribution or public offering. No
underwriters were engaged in connection with the foregoing issuances of
securities, and no underwriting discounts or commissions were paid.

                                      II-3
<PAGE>
ITEM 16. EXHIBITS AND FINANCIAL SCHEDULES.

    (A) EXHIBITS

<TABLE>
<C>          <S>
        1.1  Underwriting Agreement
       +3.1  Amended and Restated Certificate of Incorporation of Allaire
       +3.2  Amended and Restated By-Laws of Allaire
       +4.1  Specimen certificate for the Common Stock of Allaire
        5.1  Opinion of Foley, Hoag & Eliot LLP
      +10.1  1997 Stock Incentive Plan as amended
      +10.2  1998 Stock Incentive Plan
      +10.3  1998 Employee Stock Purchase Plan
      +10.4  Option Agreement for David J. Orfao
      +10.5  Form of Option Agreement for other executive officers
      +10.6  Office Lease Agreement between Allaire and One Alewife Center Realty Trust,
             dated November 5, 1997
      +10.7  Lease Agreement between Allaire and CambridgePark Two, L.P., dated May 21, 1998
      +10.8  Loan and Security Agreement between Allaire and Silicon Valley Bank, dated
             March 26, 1998
      +10.9  Negative Pledge Agreement between Allaire and Silicon Valley Bank, dated March
             26, 1998
     +10.10  Loan Modification Agreement between Allaire and Silicon Valley Bank, dated
             August 6, 1998
     +10.11  Loan Modification Agreement between Allaire and Silicon Valley Bank, dated
             December 9, 1998
     +10.12  Senior Loan and Security Agreement between Allaire and Phoenix Leasing
             Incorporated, dated May 1, 1998
     +10.13  Warrant Agreement between Allaire and Comdisco, Inc., dated August 21, 1998
     +10.14  Warrant Agreement between Allaire and Gregory Stento, dated August 21, 1998
     +10.15  Warrant Agreement between Allaire and Polaris Venture Partners, L.P., dated
             March 7, 1997
     +10.16  Warrant Agreement between Allaire and Polaris Venture Partners Founders' Fund,
             L.P., dated March 7, 1997
     +10.17  Amended and Restated Registration Rights Agreement, dated May 15, 1997
     +10.18  Waiver and Amendment No. 1 to Amended and Restated Registration Rights
             Agreement, dated December 7, 1998
     +10.19  Letter of Offer of Employment from Allaire to David J. Orfao, dated December
             23, 1996
     +10.20  Contribution and Restricted Stock Purchase Agreement between Allaire and Yesler
             Software, Inc., dated July 14, 1998
     +10.21  Working Capital Line of Credit Letter from Polaris Ventures Partners, L.P., and
             Polaris Venture Partners Founders' Fund, L.P., dated December 4, 1998
      10.22  Agreement and Plan of Merger, dated as of April 2, 1999, by and among Allaire,
             Bengal Acquisition Corp. and Bright Tiger Technologies, Inc. (included as
             Exhibit 2.1 to Allaire's Current Report on Form 8-K filed with the Securities
             and Exchange Commission on April 27, 1999 and incorporated herein by
             reference.)
</TABLE>

                                      II-4
<PAGE>
<TABLE>
<C>          <S>
     ++11.1  Statement re computation of unaudited net loss per share and pro forma net loss
             per share
     ++21.1  Subsidiaries of Allaire Corporation
       23.2  Consent of Foley, Hoag & Eliot LLP (included in Exhibit 5.1)
</TABLE>

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

+     Included in Allaire's Registration Statement on Form S-1 (File No.
 333-68639) and

      incorporated herein by reference.

++ Previously Filed.

    (B) FINANCIAL STATEMENT SCHEDULES

    II--Valuation and Qualifying Accounts

    All other schedules are omitted because they are not applicable or the
required information is shown in the financial statements or the notes thereto.

ITEM 17. UNDERTAKINGS.

    Insofar as indemnification for liabilities arising under the Securities Act
of 1933 (the "Securities Act") may be permitted to directors, officers and
controlling persons of the registrant pursuant to the foregoing provisions, or
otherwise, the registrant has been advised that in the opinion of the Securities
and Exchange Commission such indemnification is against public policy as
expressed in the Securities Act and is, therefore, unenforceable. In the event
that a claim for indemnification against such liabilities (other than the
payment by the registrant of expenses incurred or paid by a director, officer or
controlling person of the registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered, the registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the
Securities Act and will be governed by the final adjudication of such issue.

    The undersigned registrant hereby undertakes:

    (1)  To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:

        (i)  To include any prospectus required by section 10(a)(3) of the
    Securities Act of 1933;

        (ii)  To reflect in the prospectus any facts or events arising after the
    effective date of the registration statement (or the most recent
    post-effective amendment thereof) which, individually or in the aggregate,
    represent a fundamental change in the information set forth in the
    registration statement. Notwithstanding the foregoing, any increase or
    decrease in volume of securities offered (if the total dollar value of
    securities offered would not exceed that which was registered) and any
    deviation from the low or high end of the estimated maximum offering range
    may be reflected in the form of prospectus filed with the Commission
    pursuant to Rule 424(b) if, in the aggregate, the changes in volume and
    price represent no more than 20 percent change in the maximum

                                      II-5
<PAGE>
    aggregate offering price set forth in the "Calculation of Registration Fee"
    table in the effective registration statement;

        (iii)  To include any material information with respect to the plan of
    distribution not previously disclosed in the registration statement or any
    material change to such information in the registration statement.

    (2)  That, for the purpose of determining any liability under the Securities
Act of 1933, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

    (3)  To remove from registration by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of the
offering.

                                      II-6
<PAGE>
                                   SIGNATURES

    Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Amendment No. 2 to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Boston, Massachusetts, on
the 24th day of September, 1999.

<TABLE>
<S>                             <C>  <C>
                                ALLAIRE CORPORATION

                                BY:              /s/ DAVID J. ORFAO
                                     -----------------------------------------
                                                   David J. Orfao
                                       PRESIDENT AND CHIEF EXECUTIVE OFFICER
</TABLE>

                               POWER OF ATTORNEY

    KNOW ALL MEN BY THESE PRESENTS that each individual whose signature appears
below constitutes and appoints David J. Orfao and David A. Gerth, and each of
them, his true and lawful attorneys-in-fact and agents with full power of
substitution, for him and in his name, place and stead, in any and all
capacities, to sign any and all amendments (including post-effective amendments)
to this registration statement, and to file the same, with all exhibits thereto,
and all documents in connection therewith, with the Securities and Exchange
Commission, granting unto said attorneys-in-fact and agents, and each of them,
full power and authority to do and perform each and every act and thing which
they, or any of them, may deem necessary or advisable to be done in connection
with this registration statement, as fully to all intents and purposes as he
might or could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents or any of them, or any substitute or substitutes
for any or all of them, may lawfully do or cause to be done by virtue hereof.

    Pursuant to the requirements of the Securities Act of 1933, this Amendment
No. 2 has been signed by the following persons in the capacities and on the
dates indicated.

    In accordance with the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the dates indicated.

<TABLE>
<CAPTION>
          SIGNATURE                       TITLE                   DATE
- ------------------------------  -------------------------  -------------------
<C>                             <S>                        <C>
                                Chairman of the Board,     September 24, 1999
    /s/ JOSEPH J. ALLAIRE       Chief Technology Officer
- ------------------------------  and Executive Vice
      Joseph J. Allaire         President, Products

                                President, Chief           September 24, 1999
      /s/ DAVID J. ORFAO        Executive Officer and
- ------------------------------  Director (principal
        David J. Orfao          executive officer)
</TABLE>

                                      II-7
<PAGE>
<TABLE>
<CAPTION>
          SIGNATURE                       TITLE                   DATE
- ------------------------------  -------------------------  -------------------
<C>                             <S>                        <C>
                                Vice President, Finance    September 24, 1999
                                and Operations, Treasurer
      /s/ DAVID A. GERTH        and Chief Financial
- ------------------------------  Officer (principal
        David A. Gerth          financial and accounting
                                officer)

              *                 Director                   September 24, 1999
- ------------------------------
      Jonathan A. Flint

              *                 Director                   September 24, 1999
- ------------------------------
        John J. Gannon

              *                 Director                   September 24, 1999
- ------------------------------
      Thomas A. Herring

              *                 Director                   September 24, 1999
- ------------------------------
        Mitchell Kapor

    * By David J. Orfao as
       attorney-in-fact
</TABLE>

                                      II-8
<PAGE>
                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
EXHIBIT NO.                                               DESCRIPTION
- ------------  ----------------------------------------------------------------------------------------------------
<C>           <S>
        1.1   Underwriting Agreement

       +3.1   Amended and Restated Certificate of Incorporation of Allaire

       +3.2   Amended and Restated By-Laws of Allaire

       +4.1   Specimen certificate for the Common Stock of Allaire

        5.1   Opinion of Foley, Hoag & Eliot LLP

      +10.1   1997 Stock Incentive Plan as amended

      +10.2   1998 Stock Incentive Plan

      +10.3   1998 Employee Stock Purchase Plan

      +10.4   Option Agreement for David J. Orfao

      +10.5   Form of Option Agreement for other executive officers

      +10.6   Office Lease Agreement between Allaire and One Alewife Center Realty Trust, dated November 5, 1997

      +10.7   Lease Agreement between Allaire and CambridgePark Two, L.P., dated May 21, 1998

      +10.8   Loan and Security Agreement between Allaire and Silicon Valley Bank, dated March 26, 1998

      +10.9   Negative Pledge Agreement between Allaire and Silicon Valley Bank, dated March 26, 1998

      +10.10  Loan Modification Agreement between Allaire and Silicon Valley Bank, dated August 6, 1998

      +10.11  Loan Modification Agreement between Allaire and Silicon Valley Bank, dated December 9, 1998

      +10.12  Senior Loan and Security Agreement between Allaire and Phoenix Leasing Incorporated, dated May 1,
              1998

      +10.13  Warrant Agreement between Allaire and Comdisco, Inc., dated August 21, 1998

      +10.14  Warrant Agreement between Allaire and Gregory Stento, dated August 21, 1998

      +10.15  Warrant Agreement between Allaire and Polaris Venture Partners, L.P., dated March 7, 1997

      +10.16  Warrant Agreement between Allaire and Polaris Venture Partners Founders' Fund, L.P., dated March 7,
              1997

      +10.17  Amended and Restated Registration Rights Agreement, dated May 15, 1997

      +10.18  Waiver and Amendment No. 1 to Amended and Restated Registration Rights Agreement, dated December 7,
              1998

      +10.19  Letter of Offer of Employment from Allaire to David J. Orfao, dated December 23, 1996

      +10.20  Contribution and Restricted Stock Purchase Agreement between Allaire and Yesler Software, Inc.,
              dated July 14, 1998

      +10.21  Working Capital Line of Credit Letter from Polaris Ventures Partners, L.P., and Polaris Venture
              Partners Founders' Fund, L.P., dated December 4, 1998
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
EXHIBIT NO.                                               DESCRIPTION
- ------------  ----------------------------------------------------------------------------------------------------
<C>           <S>
       10.22  Agreement and Plan of Merger, dated as of April 2, 1999, by and among Allaire, Bengal Acquisition
              Corp. and Bright Tiger Technologies, Inc. (included as Exhibit 2.1 to Allaire's Current Report on
              Form 8-K filed with the Securities and Exchange Commission on April 27, 1999 and incorporated herein
              by reference.)

     ++11.1   Statement re computation of unaudited net loss per share and pro forma net loss per share

     ++21.1   Subsidiaries of Allaire Corporation

       23.2   Consent of Foley, Hoag & Eliot LLP (included in Exhibit 5.1)
</TABLE>

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

+     Included in Allaire's Registration Statement on Form S-1 (File No.
 333-68639) and

      incorporated herein by reference.

++ Previously filed.

<PAGE>

                                2,400,000 SHARES

                               ALLAIRE CORPORATION

                          COMMON STOCK, $.01 PAR VALUE

                             UNDERWRITING AGREEMENT

                                                              September __, 1999

CREDIT SUISSE FIRST BOSTON CORPORATION
BANCBOSTON ROBERTSON STEPHENS, INC.
DAIN RAUSCHER WESSELS, a division of
   DAIN RAUSCHER INCORPORATED
As Representatives of the Several Underwriters,
    c/o Credit Suisse First Boston Corporation,
             Eleven Madison Avenue,
                New York, N.Y. 10010-3629

Dear Sirs:

         1. INTRODUCTORY. Allaire Corporation, a Delaware corporation
("COMPANY") proposes to issue and sell 1,000,000 shares of its Common Stock,
$.01 par value per share ("SECURITIES") and the stockholders listed in SCHEDULE
A hereto ("SELLING STOCKHOLDERS") propose severally to sell an aggregate of
1,400,000 outstanding shares of the Securities (such 2,400,000 shares of
Securities being hereinafter referred to as the "FIRM SECURITIES"). The Company
also proposes to sell to the Underwriters, at the option of the Underwriters, an
aggregate of not more than 150,000 additional shares of its Securities, and
certain of the Selling Stockholders also propose to sell to the Underwriters, at
the option of the Underwriters, an aggregate of not more than 210,000 additional
outstanding shares of the Company's Securities, as set forth below (such 360,000
additional shares being hereinafter referred to as the "OPTIONAL SECURITIES").
The Firm Securities and the Optional Securities are herein collectively called
the "OFFERED SECURITIES". The Company and the Selling Stockholders hereby agree
with the several Underwriters named in SCHEDULE B hereto ("UNDERWRITERS") as
follows:

         2. REPRESENTATIONS AND WARRANTIES OF THE COMPANY AND THE SELLING
STOCKHOLDERS. (a) The Company represents and warrants to, and agrees with, the
Selling Stockholders and the several Underwriters that:

              (i) A registration statement (No. 333-86563) relating to the
         Offered Securities, including a form of prospectus, has been filed with
         the Securities and Exchange Commission ("COMMISSION") and either (A)
         has been declared effective under the Securities Act of 1933 ("ACT")
         and is not proposed to be amended or (B) is proposed to be amended by
         amendment or post-effective amendment. If such registration statement
         (the "INITIAL REGISTRATION STATEMENT") has been declared effective,
         either (A) an additional registration statement (the "ADDITIONAL
         REGISTRATION STATEMENT") relating to the Offered Securities may have
         been filed with the Commission pursuant to Rule 462(b) ("RULE 462(b)")
         under the Act and, if so filed, has become effective upon filing
         pursuant to such Rule and the Offered Securities all have been duly
         registered under the Act pursuant to the initial registration statement
         and, if applicable, the additional registration statement or (B) such
         an additional registration statement is proposed to be filed with the
         Commission pursuant to Rule 462(b) and will become effective upon
         filing pursuant to such Rule and upon such filing the Offered
         Securities will all have been duly registered under the Act pursuant to
         the initial registration statement and such additional
<PAGE>

         registration statement. If the Company does not propose to amend the
         initial registration statement or if an additional registration
         statement has been filed and the Company does not propose to amend it,
         and if any post-effective amendment to either such registration
         statement has been filed with the Commission prior to the execution and
         delivery of this Agreement, the most recent amendment (if any) to each
         such registration statement has been declared effective by the
         Commission or has become effective upon filing pursuant to Rule 462(c)
         ("RULE 462(c)") under the Act or, in the case of the additional
         registration statement, Rule 462(b). For purposes of this Agreement,
         "EFFECTIVE TIME" with respect to the initial registration statement or,
         if filed prior to the execution and delivery of this Agreement, the
         additional registration statement means (A) if the Company has advised
         the Representatives that it does not propose to amend such registration
         statement, the date and time as of which such registration statement,
         or the most recent post-effective amendment thereto (if any) filed
         prior to the execution and delivery of this Agreement, was declared
         effective by the Commission or has become effective upon filing
         pursuant to Rule 462(c), or (B) if the Company has advised the
         Representatives that it proposes to file an amendment or post-effective
         amendment to such registration statement, the date and time as of which
         such registration statement, as amended by such amendment or
         post-effective amendment, as the case may be, is declared effective by
         the Commission. If an additional registration statement has not been
         filed prior to the execution and delivery of this Agreement but the
         Company has advised the Representatives that it proposes to file one,
         "EFFECTIVE TIME" with respect to such additional registration statement
         means the date and time as of which such registration statement is
         filed and becomes effective pursuant to Rule 462(b). "EFFECTIVE DATE"
         with respect to the initial registration statement or the additional
         registration statement (if any) means the date of the Effective Time
         thereof. The initial registration statement, as amended at its
         Effective Time, including all information contained in the additional
         registration statement (if any) and deemed to be a part of the initial
         registration statement as of the Effective Time of the additional
         registration statement pursuant to the General Instructions of the Form
         on which it is filed and including all information (if any) deemed to
         be a part of the initial registration statement as of its Effective
         Time pursuant to Rule 430A(b) ("RULE 430A(b)") under the Act, is
         hereinafter referred to as the "INITIAL REGISTRATION STATEMENT". The
         additional registration statement, as amended at its Effective Time,
         including the contents of the initial registration statement
         incorporated by reference therein and including all information (if
         any) deemed to be a part of the additional registration statement as of
         its Effective Time pursuant to Rule 430A(b), is hereinafter referred to
         as the "ADDITIONAL REGISTRATION STATEMENT". The Initial Registration
         Statement and the Additional Registration Statement are hereinafter
         referred to collectively as the "REGISTRATION STATEMENTS" and
         individually as a "REGISTRATION STATEMENT". The form of prospectus
         relating to the Offered Securities, as first filed with the Commission
         pursuant to and in accordance with Rule 424(b) ("RULE 424(b)") under
         the Act or (if no such filing is required) as included in a
         Registration Statement, is hereinafter referred to as the "PROSPECTUS".
         No document has been or will be prepared or distributed in reliance on
         Rule 434 under the Act.

              (ii) If the Effective Time of the Initial Registration Statement
         is prior to the execution and delivery of this Agreement: (A) on the
         Effective Date of the Initial Registration Statement, the Initial
         Registration Statement conformed in all material respects to the
         requirements of the Act and the rules and regulations of the Commission
         ("RULES AND REGULATIONS") and did not include any untrue statement of a
         material fact or omit to state any material fact required to be stated
         therein or necessary to make the statements therein not misleading, (B)
         on the Effective Date of the Additional Registration Statement (if
         any), each Registration Statement conformed or will conform, in all
         material respects to the requirements of the Act and the Rules and
         Regulations and did not include, or will not include, any untrue
         statement of a material fact and did not omit, or will not omit, to
         state any material fact required to be stated therein or necessary to
         make the statements therein not misleading, and (C) on the date of this
         Agreement, the Initial Registration Statement and, if the Effective
         Time of the Additional Registration Statement is prior to the execution
         and delivery of this Agreement, the Additional Registration Statement
         each conforms, and at the time of filing of the Prospectus pursuant to
         Rule 424(b) or (if no such filing is required) at the Effective Date of
         the Additional Registration Statement in which the Prospectus is
         included, each Registration Statement and the Prospectus will conform,
         in all material respects to the requirements of the Act and the Rules
         and Regulations, and neither of such


                                      -2-
<PAGE>

         documents includes, or will include, any untrue statement of a material
         fact or omits, or will omit, to state any material fact required to be
         stated therein or necessary to make the statements therein not
         misleading. If the Effective Time of the Initial Registration Statement
         is subsequent to the execution and delivery of this Agreement: on the
         Effective Date of the Initial Registration Statement, the Initial
         Registration Statement and the Prospectus will conform in all material
         respects to the requirements of the Act and the Rules and Regulations,
         neither of such documents will include any untrue statement of a
         material fact or will omit to state any material fact required to be
         stated therein or necessary to make the statements therein not
         misleading, and no Additional Registration Statement has been or will
         be filed. The two preceding sentences do not apply to statements in or
         omissions from a Registration Statement or the Prospectus based upon
         written information furnished to the Company by any Underwriter through
         the Representatives specifically for use therein, it being understood
         and agreed that the only such information is that described as such in
         Section 7(c) hereof.

              (iii) The Company has been duly incorporated and is an existing
         corporation in good standing under the laws of the State of Delaware,
         with power and authority (corporate and other) to own its properties
         and conduct its business as described in the Prospectus; and the
         Company is duly qualified to do business as a foreign corporation in
         good standing in all other jurisdictions in which its ownership or
         lease of property or the conduct of its business requires such
         qualification and the failure to be so qualified would have a material
         adverse effect on the condition (financial or other), business,
         prospects, properties or results of operations of the Company and its
         subsidiaries taken as whole.

              (iv) Each subsidiary of the Company has been duly incorporated and
         is an existing corporation in good standing under the laws of the
         jurisdiction of its incorporation, with power and authority (corporate
         and other) to own its properties and conduct its business as described
         in the Prospectus; and each subsidiary of the Company is duly qualified
         to do business as a foreign corporation in good standing in all other
         jurisdictions in which its ownership or lease of property or the
         conduct of its business requires such qualification and the failure to
         be so qualified would have a material adverse effect on the condition
         (financial or other), business, prospects, properties or results of
         operations of the Company and it is subsidiaries taken as whole; all of
         the issued and outstanding capital stock of each subsidiary of the
         Company has been duly authorized and validly issued and is fully paid
         and nonassessable; and the capital stock of each subsidiary owned by
         the Company, directly or through subsidiaries, is owned free from
         liens, encumbrances and defects.

              (v) The Offered Securities and all other outstanding shares of
         capital stock of the Company have been duly authorized; all outstanding
         shares of capital stock of the Company are, and when Offered Securities
         have been delivered and paid for in accordance with this Agreement on
         each Closing Date (as defined below), such Offered Securities will have
         been validly issued, fully paid and nonassessable and will conform to
         the description thereof contained in the Prospectus; and the
         stockholders of the Company have no preemptive rights with respect to
         the Securities. The information set forth under the caption
         "Capitalization" in the Prospectus is true and correct. There are no
         outstanding options, warrants or other rights granted to or by the
         Company to purchase Securities or other securities of the Company other
         than as described in the Prospectus.

              (vi) Except as disclosed in the Prospectus, there are no
         contracts, agreements or understandings between the Company and any
         person that would give rise to a valid claim against the Company or any
         Underwriter for a brokerage commission, finder's fee or other like
         payment in connection with this offering.

              (vii) Except as disclosed in the Prospectus, there are no
         contracts, agreements or understandings between the Company and any
         person granting such person the right to require the Company to file a
         registration statement under the Act with respect to any securities of
         the Company owned or to be owned by such person or to require the
         Company to include such securities in the securities registered
         pursuant to a Registration Statement or in any securities being
         registered pursuant to any other registration statement filed by the
         Company under the Act.


                                      -3-
<PAGE>

              (viii) The Securities have been approved for listing subject to
         notice of issuance on the Nasdaq Stock Market's National Market.

              (ix) No consent, approval, authorization, or order of, or filing
         with, any governmental agency or body or any court is required to be
         obtained or made by the Company for the consummation of the
         transactions contemplated by this Agreement in connection with the sale
         of the Offered Securities, except such as have been obtained and made
         under the Act and such as may be required under state securities laws
         and by the National Association of Securities Dealers, Inc. ("NASD").

              (x) The execution, delivery and performance of this Agreement, and
         the consummation of the transactions herein contemplated will not
         result in a breach or violation of any of the terms and provisions of,
         or constitute a default under, any statute, any rule, regulation or
         order of any governmental agency or body or any court, domestic or
         foreign, having jurisdiction over the Company or any subsidiary of the
         Company or any of their properties, or any agreement or instrument to
         which the Company or any such subsidiary is a party or by which the
         Company or any such subsidiary is bound or to which any of the
         properties of the Company or any such subsidiary is subject, or the
         charter or by-laws of the Company or any such subsidiary.

              (xi) This Agreement has been duly authorized, executed and
         delivered by the Company.

              (xii) Except as disclosed in the Prospectus, the Company and its
         subsidiaries have good and marketable title to all real properties and
         all other properties and assets owned by them, in each case free from
         liens, encumbrances and defects that would materially affect the value
         thereof or materially interfere with the use made or to be made thereof
         by them; and except as disclosed in the Prospectus, the Company and its
         subsidiaries hold any leased real or personal property under valid and
         enforceable leases with no exceptions that would materially interfere
         with the use made or to be made thereof by them.

              (xiii) The Company and its subsidiaries possess adequate
         certificates, authorities or permits issued by appropriate governmental
         agencies or bodies necessary to conduct the business now operated by
         them and have not received any notice of proceedings relating to the
         revocation or modification of any such certificate, authority or permit
         that, if determined adversely to the Company or any of its
         subsidiaries, would individually or in the aggregate have a material
         adverse effect on the condition (financial or other), business,
         properties or results of operations of the Company and its subsidiaries
         taken as a whole ("MATERIAL ADVERSE EFFECT").

              (xiv) No labor dispute with the employees of the Company or any
         subsidiary exists or, to the knowledge of the Company, is imminent that
         might have a Material Adverse Effect.

              (xv) Except as disclosed in the Prospectus, the Company and each
         of its subsidiaries have the right to use all trademarks, trade names,
         trade secrets, servicemarks, inventions, patent rights, mask works,
         copyrights, licenses, software code, audiovisual works, formats,
         algorithms and underlying data required to operate its business as
         presently being conducted and proposed to be conducted as described in
         the Prospectus, and the Company and each of its subsidiaries have all
         required approvals and governmental authorizations now used in, or
         which are necessary for fulfillment of their respective obligations or
         the conduct of their respective businesses as now conducted or proposed
         to be conducted as described in the Prospectus; and neither the Company
         nor any of its subsidiaries is knowingly infringing any trademark,
         trade name rights, patent rights, mask works, copyrights, licenses,
         trade secret, servicemarks or other similar rights of others, and there
         is no claim being made against the Company or any of its subsidiaries
         regarding trademark, trade name, patent, mask work, copyright, license,
         trade secret or other infringement or assertion of intellectual
         property rights which could have a material adverse effect on the
         earnings, properties, business affairs or business prospects,
         stockholders' equity, net worth or results of operations of the Company
         and its subsidiaries taken as a whole. The Company has agreements in
         place with each employee, consultant or other person or party engaged
         by the Company or any subsidiary providing for the assignment to the


                                      -4-
<PAGE>

         Company or any of its subsidiaries, as the case may be, of all
         intellectual property and exploitation rights in the work performed and
         the protection of the trade secrets and confidential information of the
         Company, each of its subsidiaries and of third parties which have been
         developed by such person for or on behalf of the Company or any of its
         subsidiaries. The Company's and its subsidiaries' computer software
         (the "Software") is "Millennium Compliant". For the purposes of this
         Agreement "Millennium Compliant" means: (i) the functions,
         calculations, and other computing processes of the Software
         (collectively, "Processes") perform in an accurate manner regardless of
         the date in time on which the Processes are actually performed and
         regardless of the date input to the Software, and whether or not the
         dates are affected by leap years; (ii) the Software can accept, store,
         sort, extract, sequence, and otherwise manipulate date inputs and date
         values, and return and display date values, in a materially accurate
         manner regardless of the dates used or format of the date input; (iii)
         the Software will function without interruptions caused by the date in
         time on which the Processes are actually performed or by the date input
         to the Software; (iv) the Software accepts and responds to four (4)
         digit year date input in a manner that resolves any material
         ambiguities as to the century in an accurate manner; and (v) the
         Software displays, prints and provides electronic output of date
         information in ways that are unambiguous as to the determination of the
         century.

              (xvi) Except as disclosed in the Prospectus, neither the Company
         nor any of its subsidiaries is in violation of any statute, any rule,
         regulation, decision or order of any governmental agency or body or any
         court, domestic or foreign, relating to the use, disposal or release of
         hazardous or toxic substances or relating to the protection or
         restoration of the environment or human exposure to hazardous or toxic
         substances (collectively, "ENVIRONMENTAL LAWS"), owns or operates any
         real property contaminated with any substance that is subject to any
         environmental laws, is liable for any off-site disposal or
         contamination pursuant to any environmental laws, or is subject to any
         claim relating to any environmental laws, which violation,
         contamination, liability or claim would individually or in the
         aggregate have Material Adverse Effect; and the Company is not aware of
         any pending investigation which might lead to such a claim.

              (xvii) There are no pending actions, suits or proceedings against
         or affecting the Company, any of its subsidiaries or any of their
         respective properties that, if determined adversely to the Company or
         any of its subsidiaries, would individually or in the aggregate have a
         Material Adverse Effect, or would materially and adversely affect the
         ability of the Company to perform its obligations under this Agreement,
         or which are otherwise material in the context of the sale of the
         Offered Securities; and no such actions, suits or proceedings have been
         threatened or, to the Company's knowledge, contemplated.

              (xviii) The financial statements included in each Registration
         Statement and the Prospectus present fairly the financial position of
         the Company and its consolidated subsidiaries as of the dates shown and
         their results of operations and cash flows for the periods shown, and
         such financial statements have been prepared in conformity with the
         generally accepted accounting principles in the United States applied
         on a consistent basis and the schedules included in each Registration
         Statement present fairly the information required to be stated therein.

              (xix) Except as disclosed in the Prospectus, since the date of the
         latest audited financial statements included in the Prospectus there
         has been no material adverse change, nor any development or event
         involving a prospective material adverse change, in the condition
         (financial or other), business, properties or results of operations of
         the Company and its subsidiaries taken as a whole, and, except as
         disclosed in or contemplated by the Prospectus, there has been no
         dividend or distribution of any kind declared, paid or made by the
         Company on any class of its capital stock.

              (xx) The Company is not and, after giving effect to the offering
         and sale of the Offered Securities and the application of the proceeds
         thereof as described in the Prospectus, will not be an "investment
         company" as defined in the Investment Company Act of 1940.


                                      -5-
<PAGE>

              (xxi) Neither the Company nor any of its affiliates does business
         with the government of Cuba or with any person or affiliate located in
         Cuba within the meaning of Section 517.075, Florida Statutes and the
         Company agrees to comply with such Section if prior to the completion
         of the distribution of the Offered Securities it commences doing such
         business.

              (xxii) The Company and each of its subsidiaries has filed all
         foreign, federal, state and local tax returns that are required to be
         filed or has requested extensions thereof (except in any case in which
         the failure so to file would not have a material adverse effect on the
         Company and its subsidiaries, taken as a whole) and the Company and
         each of its subsidiaries has paid all material taxes required to be
         paid by it and any other assessment, fine or penalty levied against it,
         to the extent that any of the foregoing is due and payable, except for
         any such assessment, fine or penalty that is currently being contested
         in good faith or as described in or contemplated by the Registration
         Statement or the Prospectus.

              (xxiii) PricewaterhouseCoopers LLP, who have certified the
         financial statements filed with the Commission as part of each
         Registration Statement, are independent public accountants as required
         by the Act and the Rules and Regulations. The Company maintains a
         system of internal accounting controls sufficient to provide reasonable
         assurances that (i) transactions are executed in accordance with
         management's general or specific authorization; (ii) transactions are
         recorded as necessary to permit preparation of financial statements in
         conformity with generally accepted accounting principles and to
         maintain accountability for assets; and (iii) access to assets is
         permitted only in accordance with management's general or specific
         authorization.

              (xxiv) The Company and each of its subsidiaries carry, or are
         covered by, insurance in such amounts and covering such risks as is
         adequate for the conduct of their respective businesses and the value
         of their respective properties and as is customary for companies
         engaged in similar industries.

              (xxv) The Company and each of its subsidiaries are in compliance
         in all material respects with all presently applicable provisions of
         the Employee Retirement Income Security Act of 1974, as amended,
         including the regulations and published interpretations thereunder
         ("ERISA"); no "reportable event" (as defined in ERISA) has occurred
         with respect to any "pension plan" (as defined in ERISA) for which the
         Company or any of its subsidiaries would have any liability; the
         Company and each of its subsidiaries have not incurred and do not
         expect to incur liability under (i) Title IV of ERISA with respect to
         termination of, or withdrawal from, any "pension plan" or (ii) Section
         412 or 4971 of the Internal Revenue Code of 1986, as amended, including
         the regulations and published interpretations thereunder ("Code"); and
         each "pension plan" for which the Company and each of its subsidiaries
         would have any liability that is intended to be qualified under Section
         401(a) of the Code is so qualified in all material respect and nothing
         has occurred, whether by action or by failure to act, which would cause
         the loss of such qualification.

              (xxvi) Except as set forth in each Registration Statement and the
         Prospectus, there are no agreements, claims, payments, issuances,
         arrangements or understandings, whether oral or written, for services
         in the nature of finder's, consulting or origination fees with respect
         to the sale of the Offered Securities or any other arrangements,
         agreements, understandings, payments or issuance with respect to the
         Company or any of its officers, directors, shareholders, partners,
         employees, subsidiaries or affiliates that may affect the Underwriters'
         compensation as determined by the NASD.

              (xxvii) Except as set forth in each Registration Statement
         (including without limitation the documents incorporated by reference
         therein) and the Prospectus, no officer, director or shareholder of the
         Company or any "affiliate" or "associate" (as these terms are defined
         in Rule 405 under the Act) of any of the foregoing persons or entities
         has or has had, either directly or indirectly (i) an interest in any
         person or entity that (x) furnishes or sells services or products which
         are furnished or sold or that are proposed to be furnished or sold by
         the Company, or (y) purchases from or sells or furnishes to the Company
         any goods or services, or (ii) a beneficial interest in any contract or
         agreement to which the Company is a party or by which it may be bound


                                      -6-
<PAGE>

         or affected. Except as set forth in each Registration Statement and the
         Prospectus under the caption "Certain Transactions" and "Management",
         there are no existing or proposed agreements, arrangements,
         understandings or transactions, between or among the Company and any
         officer, director, principal shareholder of the Company or any partner,
         affiliate or associate of any of the foregoing persons or entities.

              (xxviii) The minute books of the Company made available to the
         Underwriters contain a complete summary of all meetings and actions of
         the directors and shareholders of the Company since the time of its
         incorporation and reflects accurately and fairly in all respects all
         transactions referred to in such minutes.

         (b) Each Selling Stockholder severally represents and warrants to, and
agrees with, the several Underwriters that:

              (i) Such Selling Stockholder has and on each Closing Date
         hereinafter mentioned will have valid and unencumbered title to the
         Offered Securities to be delivered by such Selling Stockholder on such
         Closing Date and full right, power and authority to enter into this
         Agreement and to sell, assign, transfer and deliver the Offered
         Securities to be delivered by such Selling Stockholder on such Closing
         Date hereunder; and upon the delivery of and payment for the Offered
         Securities on each Closing Date hereunder the several Underwriters will
         acquire valid and unencumbered title to the Offered Securities to be
         delivered by such Selling Stockholder on such Closing Date.

              (ii) (a) If such Selling Shareholder is Joseph J. Allaire or
         David J. Orfao, then, if the Effective Time of the Initial
         Registration Statement is prior to the execution and delivery of this
         Agreement: (A) on the Effective Date of the Initial Registration
         Statement, the Initial Registration Statement conformed in all material
         respects to the requirements of the Act and the Rules and Regulations
         and did not include any untrue statement of a material fact or omit to
         state any material fact required to be stated therein or necessary to
         make the statements therein not misleading, (B) on the Effective Date
         of the Additional Registration Statement (if any), each Registration
         Statement conformed, or will conform, in all material respects to the
         requirements of the Act and the Rules and Regulations did not include,
         or will not include, any untrue statement of a material fact and did
         not omit, or will not omit, to state any material fact required to be
         stated therein or necessary to make the statements therein not
         misleading, and (C) on the date of this Agreement, the Initial
         Registration Statement and, if the Effective Time of the Additional
         Registration Statement is prior to the execution and delivery of this
         Agreement, the Additional Registration Statement each conforms, and at
         the time of filing of the Prospectus pursuant to Rule 424(b) or (if no
         such filing is required) at the Effective Date of the Additional
         Registration Statement in which the Prospectus is included, each
         Registration Statement and the Prospectus will conform, in all material
         respects to the requirements of the Act and the Rules and Regulations,
         and neither of such documents includes, or will include, any untrue
         statement of a material fact or omits, or will omit, to state any
         material fact required to be stated therein or necessary to make the
         statements therein not misleading. If the Effective Time of the Initial
         Registration Statement is subsequent to the execution and delivery of
         this Agreement: on the Effective Date of the Initial Registration
         Statement, the Initial Registration Statement and the Prospectus will
         conform in all respects to the requirements of the Act and the Rules
         and Regulations, neither of such documents will include any untrue
         statement of a material fact or will omit to state any material fact
         required to be stated therein or necessary to make the statements
         therein not misleading. The two preceding sentences do not apply to
         statements in or omissions from a Registration Statement or the
         Prospectus based upon written information furnished to the Company by
         any Underwriter through the Representatives specifically for use
         therein, it being understood and agreed that the only such information
         is that described as such in Section 7(c).

                (ii) (b) All information furnished by or on behalf of each other
         Selling Stockholder in writing expressly for use in each Registration
         Statement and the Prospectus (A) is, and on the First Closing Date and
         the Optional Closing Date will be, accurate and complete in all
         material respects and (B) does not, and on the First Closing Date and
         the Optional Closing Date will not, contain any untrue statement of
         material fact or omit to


                                      -7-
<PAGE>

         state any material fact necessary to make such information not
         misleading. Such Selling Stockholder confirms as accurate the numbers
         of shares of Securities set forth opposite such Selling Stockholder's
         name in the Prospectus under the caption "Principal and Selling
         Stockholders" (both prior to and after giving effect to the sale of the
         Offered Securities).

              (iii) Except as disclosed in the Prospectus, there are no
         contracts, agreements or understandings between such Selling
         Stockholder and any person that would give rise to a valid claim
         against the Selling Stockholder or any Underwriter for a brokerage
         commission, finder's fee or other like payment in connection with this
         offering.

         3. PURCHASE, SALE AND DELIVERY OF OFFERED SECURITIES. On the basis of
the representations, warranties and agreements herein contained, but subject to
the terms and conditions herein set forth, the Company and each Selling
Stockholder agree, severally and not jointly, to sell to each Underwriter, and
each Underwriter agrees, severally and not jointly, to purchase from the Company
and each Selling Stockholder, at a purchase price of $ per share, that number of
Firm Securities (rounded up or down, as determined by Credit Suisse First Boston
Corporation ("CSFBC") in its discretion, in order to avoid fractions) obtained
by multiplying 1,000,000 Firm Securities in the case of the Company and the
number of Firm Securities set forth opposite the name of such Selling
Stockholder in SCHEDULE A hereto, in the case of a Selling Stockholder, in each
case by a fraction the numerator of which is the number of Firm Securities set
forth opposite the name of such Underwriter in SCHEDULE B hereto and the
denominator of which is the total number of Firm Securities.

         Certificates in negotiable form for the Offered Securities to be sold
by the Selling Stockholders hereunder have been placed in custody, for delivery
under this Agreement, under Custody Agreements made with BankBoston, N.A., as
custodian ("CUSTODIAN") and the Irrevocable Power of Attorney of the Selling
Stockholders ("POWER OF ATTORNEY") appointing certain individuals as named
therein as such Selling Stockholders attorney in fact, has been executed by the
Selling Stockholders. Each Selling Stockholder agrees that the shares
represented by the certificate or certificates held in custody for such Selling
Stockholder under such Custody Agreements is or are subject to the interests of
the Underwriters hereunder, that the arrangements made by such Selling
Stockholder for such custody are to that extent irrevocable, and that the
obligations of such Selling Stockholder hereunder shall not be terminated by
operation of law, whether by the death of any individual Selling Stockholder or
the occurrence of any other event, or in the case of a trust, by the death of
any trustee or trustees or the termination of such trust. If any individual
Selling Stockholder or any such trustee or trustees should die, or if any other
such event should occur, or if any of such trusts should terminate, before the
delivery of the Offered Securities hereunder, certificates for such Offered
Securities shall be delivered by the Custodian in accordance with the terms and
conditions of this Agreement as if such death or other event or termination had
not occurred, regardless of whether or not the Custodian shall have received
notice of such death or other event or termination.

         The Company and the Custodian will deliver the Firm Securities to the
Representatives for the accounts of the Underwriters, against payment of the
purchase price in Federal (same day) funds by official bank check or checks or
wire transfer to an account at a bank acceptable to CSFBC drawn to the order of
Allaire Corporation in the case of 1,000,000 shares of Firm Securities sold by
the Company and at a bank designated by the Custodian drawn to the order of the
Custodian for the account of the Selling Stockholders in the case of 1,400,000
shares of Firm Securities sold by the Selling Stockholders, at the office of
Foley, Hoag & Eliot LLP, One Post Office Square, Boston, Massachusetts 02109, at
        A.M., New York time, on                            , or at such other
time not later than seven full business days thereafter as CSFBC and the Company
determine, such time being herein referred to as the "FIRST CLOSING DATE". The
certificates for the Firm Securities so to be delivered will be in definitive
form, in such denominations and registered in such names as CSFBC requests and
will be made available for checking and packaging at the above office of Foley,
Hoag & Eliot LLP, One Post Office Square, Boston, Massachusetts 02109 at least
24 hours prior to the First Closing Date.


                                      -8-
<PAGE>

         In addition, upon written notice from CSFBC given to the Company and
the Selling Stockholders from time to time not more than 30 days subsequent to
the date of the Prospectus, the Underwriters may purchase all or less than all
of the Optional Securities at the purchase price per Security to be paid for the
Firm Securities. The Company and the Selling Stockholders agree, severally and
not jointly, to sell to the Underwriters the respective numbers of Optional
Securities obtained by multiplying the number of Optional Securities specified
in such notice by a fraction the numerator of which is 150,000 in the case of
the Company and the number of shares set forth opposite the names of such
Selling Stockholders in SCHEDULE A hereto under the caption "Number of Optional
Securities to be Sold" in the case of the Selling Stockholders, and the
denominator of which is the total number of Optional Securities (subject to
adjustment by CSFBC to eliminate fractions). Such Optional Securities shall be
purchased from the Company and each Selling Stockholder for the account of each
Underwriter in the same proportion as the number of Firm Securities set forth
opposite such Underwriter's name bears to the total number of Firm Securities
(subject to adjustment by CSFBC to eliminate fractions) and may be purchased by
the Underwriters only for the purpose of covering over-allotments made in
connection with the sale of the Firm Securities. No Optional Securities shall be
sold or delivered unless the Firm Securities previously have been, or
simultaneously are, sold and delivered. The right to purchase the Optional
Securities or any portion thereof may be exercised from time to time and to the
extent not previously exercised may be surrendered and terminated at any time
upon notice by CSFBC to the Company and the Selling Stockholders.

         Each time for the delivery of and payment for the Optional Securities,
being herein referred to as an "OPTIONAL CLOSING DATE", which may be the First
Closing Date (the First Closing Date and each Optional Closing Date, if any,
being sometimes referred to as a "CLOSING DATE"), shall be determined by CSFBC
but shall be not later than five full business days after written notice of
election to purchase Optional Securities is given. The Company and the Custodian
will deliver the Optional Securities being purchased on each Optional Closing
Date to the Representatives for the accounts of the several Underwriters,
against payment of the purchase price therefor in Federal (same day) funds by
official bank check or checks or wire transfer to an account at a bank
acceptable to CSFBC drawn to the order of Allaire Corporation in the case of
150,000 Optional Securities sold by the Company and at a bank designated by the
Custodian drawn to the order of the Custodian, for the account of the Selling
Stockholders in the case of 210,000 Optional Securities sold by the Selling
Stockholders, at the above office of Foley, Hoag & Eliot LLP, One Post Office
Square, Boston, Massachusetts 02109. The certificates for the Optional
Securities being purchased on each Optional Closing Date will be in definitive
form, in such denominations and registered in such names as CSFBC requests upon
reasonable notice prior to such Optional Closing Date and will be made available
for checking and packaging at the above office of Foley, Hoag & Eliot LLP, One
Post Office Square, Boston, Massachusetts 02109 at a reasonable time in advance
of such Optional Closing Date.

         4. OFFERING BY UNDERWRITERS. It is understood that the several
Underwriters propose to offer the Offered Securities for sale to the public as
set forth in the Prospectus.

         5. CERTAIN AGREEMENTS OF THE COMPANY AND THE SELLING STOCKHOLDERS. The
Company agrees with the several Underwriters and the Selling Stockholders that:

              (a) If the Effective Time of the Initial Registration Statement is
         prior to the execution and delivery of this Agreement, the Company will
         file the Prospectus with the Commission pursuant to and in accordance
         with subparagraph (1) (or, if applicable and if consented to by CSFBC,
         subparagraph (4)) of Rule 424(b) not later than the earlier of (A) the
         second business day following the execution and delivery of this
         Agreement or (B) the fifteenth business day after the Effective Date of
         the Initial Registration Statement.

         The Company will advise CSFBC promptly of any such filing pursuant to
         Rule 424(b). If the Effective Time of the Initial Registration
         Statement is prior to the execution and delivery of this Agreement and
         an additional registration statement is necessary to register a portion
         of the Offered Securities under the Act but the Effective Time thereof
         has not occurred as of such execution and delivery, the Company will
         file the additional registration statement or, if filed, will file a
         post-effective amendment thereto with the Commission pursuant to and in
         accordance with Rule 462(b) on or prior to 10:00 P.M., New York time,
         on the date of this


                                      -9-
<PAGE>

         Agreement or, if earlier, on or prior to the time the Prospectus is
         printed and distributed to any Underwriter, or will make such filing at
         such later date as shall have been consented to by CSFBC.

              (b) The Company will advise CSFBC promptly of any proposal to
         amend or supplement the initial or any additional registration
         statement as filed or the related prospectus or the Initial
         Registration Statement, the Additional Registration Statement (if any)
         or the Prospectus and will not effect such amendment or supplementation
         without CSFBC's consent, which consent shall not be unreasonably
         withheld; and the Company will also advise CSFBC promptly of the
         effectiveness of each Registration Statement (if its Effective Time is
         subsequent to the execution and delivery of this Agreement) and of any
         amendment or supplementation of a Registration Statement or the
         Prospectus and of the institution by the Commission of any stop order
         proceedings in respect of a Registration Statement and will use its
         best efforts to prevent the issuance of any such stop order and to
         obtain as soon as possible its lifting, if issued.

              (c) If, at any time when a prospectus relating to the Offered
         Securities is required to be delivered under the Act in connection with
         sales by any Underwriter or dealer, any event occurs as a result of
         which the Prospectus as then amended or supplemented would include an
         untrue statement of a material fact or omit to state any material fact
         necessary to make the statements therein, in the light of the
         circumstances under which they were made, not misleading, or if it is
         necessary at any time to amend the Prospectus to comply with the Act,
         the Company will promptly notify CSFBC of such event and will promptly
         prepare and file with the Commission, at its own expense, an amendment
         or supplement which will correct such statement or omission or an
         amendment which will effect such compliance. Neither CSFBC's consent
         to, nor the Underwriters' delivery of, any such amendment or supplement
         shall constitute a waiver of any of the conditions set forth in Section
         6.

              (d) As soon as practicable, but not later than the Availability
         Date (as defined below), the Company will make generally available to
         its securityholders an earnings statement covering a period of at least
         12 months beginning after the Effective Date of the Initial
         Registration Statement (or, if later, the Effective Date of the
         Additional Registration Statement) which will satisfy the provisions of
         Section 11(a) of the Act. For the purpose of the preceding sentence,
         "AVAILABILITY DATE" means the 45th day after the end of the fourth
         fiscal quarter following the fiscal quarter that includes such
         Effective Date, except that, if such fourth fiscal quarter is the last
         quarter of the Company's fiscal year, "AVAILABILITY DATE" means the
         90th day after the end of such fourth fiscal quarter.

              (e) The Company will furnish to the Representatives copies of each
         Registration Statement (of which will be signed and will include all
         exhibits), each related preliminary prospectus, and, so long as a
         prospectus relating to the Offered Securities is required to be
         delivered under the Act in connection with sales by any Underwriter or
         dealer, the Prospectus and all amendments and supplements to such
         documents, in each case in such quantities as CSFBC requests. The
         Prospectus shall be so furnished on or prior to 3:00 P.M., New York
         time, on the business day following the later of the execution and
         delivery of this Agreement or the Effective Time of the Initial
         Registration Statement. All other such documents shall be so furnished
         as soon as available. The Company will pay the expenses of printing and
         distributing to the Underwriters all such documents.

              (f) The Company will arrange for the qualification of the Offered
         Securities for sale under the laws of such jurisdictions as CSFBC
         designates and will continue such qualifications in effect so long as
         required for the distribution; provided, however, that the Company
         shall not be obliged to file any general consent to service of process
         or to qualify as a foreign corporation or as a securities dealer in any
         jurisdiction or to subject itself to taxation in respect of doing
         business in any jurisdiction in which it is not otherwise so subject.

              (g) During the period of five years hereafter, the Company will
         furnish to the Representatives and, upon request, to each of the other
         Underwriters, as soon as practicable after the end of each fiscal year,
         a copy of its


                                      -10-
<PAGE>

         annual report to stockholders for such year; and the Company will
         furnish to the Representatives (i) as soon as available, a copy of each
         report and any definitive proxy statement of the Company filed with the
         Commission under the Securities Exchange Act of 1934 or mailed to
         stockholders, and (ii) from time to time, such other publicly available
         information concerning the Company as CSFBC may reasonably request.

              (h) For a period of 90 days after the date of the public offering
         of the Offered Securities, the Company will not offer, sell, contract
         to sell, pledge or otherwise dispose of, directly or indirectly, or
         file with the Commission a registration statement under the Act
         relating to, any additional shares of its Securities or securities
         convertible into or exchangeable or exercisable for any shares of its
         Securities, or publicly disclose the intention to make any such offer,
         sale, pledge, disposition or filing, without the prior written consent
         of CSFBC, except issuances of Securities pursuant to the conversion or
         exchange of convertible or exchangeable securities or the exercise of
         warrants or options, in each case outstanding on the date hereof,
         grants of employee stock options pursuant to the terms of a plan in
         effect on the date hereof, issuances of Securities pursuant to the
         exercise of such options.

              (i) The Company agrees with the several Underwriters that the
         Company will pay all expenses incident to the performance of the
         obligations of the Company and Selling Stockholders under this
         Agreement, for any filing fees and other expenses (including fees and
         disbursements of counsel) in connection with qualification of the
         Offered Securities for sale under the laws of such jurisdictions as
         CSFBC designates and the printing of memoranda relating thereto, for
         the filing fee incident to, and the reasonable fees and disbursements
         of counsel to the Underwriters in connection with, the review by the
         National Association of Securities Dealers, Inc. of the Offered
         Securities, for any travel expenses of the Company's officers and
         employees and any other expenses of the Company in connection with
         attending or hosting meetings with prospective purchasers of the
         Offered Securities, for any transfer taxes on the sale by the Selling
         Stockholders of the Offered Securities to the Underwriters and for
         expenses incurred in distributing preliminary prospectuses and the
         Prospectus (including any amendments and supplements thereto) to the
         Underwriters. This Section 5(i) shall not affect or modify any
         separate, valid agreement relating to the allocation of payment of
         expenses between the Company, on the one had, and the Selling
         Stockholders, on the other hand.

              (j) Each Selling Stockholder agrees to deliver to CSFBC,
         attention: Transactions Advisory Group on or prior to the First Closing
         Date a properly completed and executed United States Treasury
         Department Form W-9 (or other applicable form or statement specified by
         Treasury Department regulations in lieu thereof).

              (k) Each Selling Stockholder agrees, for a period of 90 days after
         the date of the public offering of the Offered Securities, not to
         offer, sell, contract to sell, pledge or otherwise dispose of, directly
         or indirectly, any additional shares of the Securities of the Company
         or securities convertible into or exchangeable or exercisable for any
         shares of Securities, or publicly disclose the intention to make any
         such offer, sale, pledge or disposition, without the prior written
         consent of CSFBC.

         6. CONDITIONS OF THE OBLIGATIONS OF THE UNDERWRITERS. The obligations
of the several Underwriters to purchase and pay for the Firm Securities on the
First Closing Date and the Optional Securities to be purchased on each Optional
Closing Date will be subject to the accuracy of the representations and
warranties on the part of the Company and the Selling Stockholders herein, to
the accuracy of the statements of Company officers made pursuant to the
provisions hereof, to the performance by the Company and the Selling
Stockholders of their obligations hereunder and to the following additional
conditions precedent:

              (a) The Representatives shall have received a letter, dated the
         date of delivery thereof (which, if the Effective Time of the Initial
         Registration Statement is prior to the execution and delivery of this
         Agreement, shall be on or prior to the date of this Agreement or, if
         the Effective Time of the Initial Registration Statement is subsequent
         to the execution and delivery of this Agreement, shall be prior to the
         filing of the amendment or


                                      -11-
<PAGE>

         post-effective amendment to the registration statement to be filed
         shortly prior to such Effective Time), of PricewaterhouseCoopers LLP
         confirming that they are independent public accountants within the
         meaning of the Act and the applicable published Rules and Regulations
         thereunder and stating to the effect that:

                           (i) in their opinion the financial statements and
                  schedules examined by them and included in the Registration
                  Statements comply as to form in all material respects with the
                  applicable accounting requirements of the Act and the related
                  published Rules and Regulations;

                           (ii) on the basis of their review, a reading of the
                  latest available interim financial statements of the Company,
                  inquiries of officials of the Company who have responsibility
                  for financial and accounting matters and other specified
                  procedures, nothing came to their attention that caused them
                  to believe that:

                                    (A) the unaudited financial statements
                           included in the Registration Statements do not comply
                           as to form in all material respects with the
                           applicable accounting requirements of the Act and the
                           related published Rules and Regulations or any
                           material modifications should be made to such
                           unaudited financial statements for them to be in
                           conformity with generally accepted accounting
                           principles;

                                    (B) the unaudited consolidated total
                           revenue, total cost of revenue, gross profit, total
                           operating expenses, loss from operations, net loss
                           and net loss per share amounts for the six-month
                           periods ended June 30, 1998 and 1999 included in the
                           Prospectus do not agree with the amounts set forth in
                           the unaudited consolidated financial statements for
                           those same periods or were not determined on a basis
                           substantially consistent with that of the
                           corresponding amounts in the audited statements of
                           income;

                                    (C) at the date of the latest available
                           balance sheet read by such accountants, or at a
                           subsequent specified date not more than three
                           business days prior to the date of such letter, there
                           was any change in the capital stock or any increase
                           in short-term indebtedness or long-term debt of the
                           Company and its consolidated subsidiaries or, at the
                           date of the latest available balance sheet read by
                           such accountants, there was any decrease in
                           consolidated total current assets or total assets, as
                           compared with amounts shown on the latest balance
                           sheet included in the Prospectus; or

                                    (D) for the period from the closing date of
                           the latest income statement included in the
                           Prospectus to the closing date of the latest
                           available income statement read by such accountants
                           there were any decreases, as compared with the
                           corresponding period of the previous year, in
                           consolidated net sales or net operating income in the
                           total or per share amounts of consolidated net
                           income;

                  except in all cases set forth in clauses (A), (B), (C) and (D)
                  above for changes, increases or decreases which the Prospectus
                  discloses have occurred or may occur or which are described in
                  such letter; and

                           (iii) they have compared specified dollar amounts (or
                  percentages derived from such dollar amounts) and other
                  financial information contained in the Registration Statements
                  (in each case to the extent that such dollar amounts,
                  percentages and other financial information are derived from
                  the general accounting records of the Company and its
                  subsidiaries subject to the internal controls of the Company's
                  accounting system or are derived directly from such records by
                  analysis or computation) with the results obtained from
                  inquiries, a reading of such general accounting records and
                  other procedures specified in such letter and have found such
                  dollar amounts, percentages and other financial information to
                  be in agreement with such results, except as otherwise
                  specified in such letter.



                                      -12-
<PAGE>

         For purposes of this subsection, (i) if the Effective Time of the
         Initial Registration Statements is subsequent to the execution and
         delivery of this Agreement, "REGISTRATION STATEMENTS" shall mean the
         initial registration statement as proposed to be amended by the
         amendment or post-effective amendment to be filed shortly prior to its
         Effective Time, (ii) if the Effective Time of the Initial Registration
         Statements is prior to the execution and delivery of this Agreement but
         the Effective Time of the Additional Registration Statement is
         subsequent to such execution and delivery, "REGISTRATION Statements"
         shall mean the Initial Registration Statement and the additional
         registration statement as proposed to be filed or as proposed to be
         amended by the post-effective amendment to be filed shortly prior to
         its Effective Time, and (iii) "PROSPECTUS" shall mean the prospectus
         included in the Registration Statements.

                  (b) If the Effective Time of the Initial Registration
         Statement is not prior to the execution and delivery of this Agreement,
         such Effective Time shall have occurred not later than 10:00 P.M., New
         York time, on the date of this Agreement or such later date as shall
         have been consented to by CSFBC. If the Effective Time of the
         Additional Registration Statement (if any) is not prior to the
         execution and delivery of this Agreement, such Effective Time shall
         have occurred not later than 10:00 P.M., New York time, on the date of
         this Agreement or, if earlier, the time the Prospectus is printed and
         distributed to any Underwriter, or shall have occurred at such later
         date as shall have been consented to by CSFBC. If the Effective Time of
         the Initial Registration Statement is prior to the execution and
         delivery of this Agreement, the Prospectus shall have been filed with
         the Commission in accordance with the Rules and Regulations and Section
         5(a) of this Agreement. Prior to such Closing Date, no stop order
         suspending the effectiveness of a Registration Statement shall have
         been issued and no proceedings for that purpose shall have been
         instituted or, to the knowledge of any Selling Stockholder, the Company
         or the Representatives, shall be contemplated by the Commission.

                  (c) Subsequent to the execution and delivery of this
         Agreement, there shall not have occurred (i) any change, or any
         development or event involving a prospective change, in the condition
         (financial or other), business, properties or results of operations of
         the Company or its subsidiaries which, in the judgment of a majority in
         interest of the Underwriters including the Representatives, is material
         and adverse and makes it impractical or inadvisable to proceed with
         completion of the public offering or the sale of and payment for the
         Offered Securities; (ii) any downgrading in the rating of any debt
         securities of the Company by any "nationally recognized statistical
         rating organization" (as defined for purposes of Rule 436(g) under the
         Act), or any public announcement that any such organization has under
         surveillance or review its rating of any debt securities of the Company
         (other than an announcement with positive implications of a possible
         upgrading, and no implication of a possible downgrading, of such
         rating); (iii) any suspension or limitation of trading in securities
         generally on the New York Stock Exchange, or any setting of minimum
         prices for trading on such exchange, or any suspension of trading of
         any securities of the Company on any exchange or in the
         over-the-counter market; (iv) any banking moratorium declared by U.S.
         Federal or New York authorities; or (v) any outbreak or escalation of
         major hostilities in which the United States is involved, any
         declaration of war by Congress or any other substantial national or
         international calamity or emergency if, in the judgment of a majority
         in interest of the Underwriters including the Representatives, the
         effect of any such outbreak, escalation, declaration, calamity or
         emergency makes it impractical or inadvisable to proceed with
         completion of the public offering or the sale of and payment for the
         Offered Securities.

                  (d) The Representatives shall have received an opinion, dated
         such Closing Date, of Foley, Hoag & Eliot LLP, counsel for the Company,
         to the effect that:


                                      -13-
<PAGE>

                           (i) The Company has been duly incorporated and is an
                  existing corporation in good standing under the laws of the
                  State of Delaware, with corporate power and authority to own
                  its properties and conduct its business as described in the
                  Prospectus; and the Company is duly qualified to do business
                  as a foreign corporation in good standing in all other
                  jurisdictions in which its ownership or lease of property or
                  the conduct of its business requires such qualification and
                  the failure to be so qualified would have a material adverse
                  effect on the Company and its subsidiaries taken as whole;

                           (ii) The Offered Securities delivered on such Closing
                  Date and all other outstanding shares of the Common Stock of
                  the Company have been duly authorized and validly issued, are
                  fully paid and nonassessable and conform to the description
                  thereof contained in the Prospectus; the Company has
                  authorized and outstanding capital stock as set forth under
                  the caption "Capitalization" in the Prospectus as of the date
                  specified therein; the certificates for the Offered
                  Securities, assuming they are in the form filed with the
                  Commission, are in due and proper form; and no stockholder of
                  the Company has any preemptive rights with respect to the
                  Securities pursuant to any statute, the Company's Certificate
                  of Incorporation, By-laws, or to such counsel's knowledge, any
                  agreement with the Company;

                           (iii) Except as described in or contemplated by the
                  Prospectus, to the knowledge of such counsel, there are no
                  outstanding securities of the Company convertible or
                  exchangeable into or evidencing the right to purchase or
                  subscribe for any shares of capital stock of the Company and
                  there are no outstanding or authorized options, warrants or
                  other securities obligating the Company to issue any shares of
                  its capital stock or any securities convertible or
                  exchangeable into or evidencing the right to purchase or
                  subscribe for any shares of such capital stock;

                           (iv) There are no contracts, agreements or
                  understandings known to such counsel between the Company and
                  any person granting such person the right to require the
                  Company to file a registration statement under the Act with
                  respect to any securities of the Company owned or to be owned
                  by such person or to require the Company to include such
                  securities in the securities registered pursuant to the
                  Registration Statement or in any securities being registered
                  pursuant to any other registration statement filed by the
                  Company under the Act which have not been fully satisfied or
                  waived;

                           (v) The Company is not and, after giving effect to
                  the offering and sale of the Offered Securities and the
                  application of the proceeds thereof as described in the
                  Prospectus, will not be an "investment company" as defined in
                  the Investment Company Act of 1940;

                           (vi) No consent, approval, authorization or order of,
                  or filing with, any governmental agency or body or any court
                  is required to be obtained or made by the Company for the
                  consummation of the transactions contemplated by this
                  Agreement in connection with the sale of the Offered
                  Securities by the Company, except such as have been obtained
                  and made under the Act or the NASD and such as may be required
                  under state securities laws or the NASD;

                           (vii) The execution, delivery and performance of this
                  Agreement and the consummation of the transactions herein
                  contemplated will not result in a breach or violation of any
                  of the terms and provisions of, or constitute a default under,
                  any statute, any rule, regulation or order of any governmental
                  agency or body or any court having jurisdiction over the
                  Company or any subsidiary of the Company or any of their
                  properties, or any agreement or instrument known to such
                  counsel to which the Company or any such subsidiary is a party
                  or by which the Company or any such subsidiary is bound or to
                  which any of the properties of the Company or any such
                  subsidiary is subject, or the charter or by-laws of the
                  Company or any such subsidiary;


                                      -14-
<PAGE>

                           (viii) The Initial Registration Statement was
                  declared effective under the Act as of the date and time
                  specified in such opinion, the Additional Registration
                  Statement (if any) was filed and became effective under the
                  Act as of the date and time (if determinable) specified in
                  such opinion, the Prospectus either was filed with the
                  Commission pursuant to the subparagraph of Rule 424(b)
                  specified in such opinion on the date specified therein or was
                  included in the Initial Registration Statement or the
                  Additional Registration Statement (as the case may be), and,
                  to the knowledge of such counsel, no stop order suspending the
                  effectiveness of a Registration Statement or any part thereof
                  has been issued and no proceedings for that purpose have been
                  instituted or are pending or contemplated under the Act, and
                  each Registration Statement and the Prospectus, and each
                  amendment or supplement thereto, as of their respective
                  effective or issue dates, complied as to form in all material
                  respects with the requirements of the Act and the Rules and
                  Regulations; such counsel have no reason to believe that any
                  part of a Registration Statement or any amendment thereto, as
                  of its effective date or as of such Closing Date, contained
                  any untrue statement of a material fact or omitted to state
                  any material fact required to be stated therein or necessary
                  to make the statements therein not misleading; or that the
                  Prospectus or any amendment or supplement thereto, as of its
                  issue date or as of such Closing Date, contained any untrue
                  statement of a material fact or omitted to state any material
                  fact necessary in order to make the statements therein, in the
                  light of the circumstances under which they were made, not
                  misleading; the descriptions in the Registration Statements
                  and Prospectus of statutes, legal and governmental proceedings
                  and contracts and other documents are accurate and fairly
                  present the information required to be shown; and such counsel
                  do not know of any legal or governmental proceedings required
                  to be described in a Registration Statement or the Prospectus
                  which are not described as required or of any contracts or
                  documents of a character required to be described in a
                  Registration Statement or the Prospectus or to be filed as
                  exhibits to a Registration Statement which are not described
                  and filed as required; it being understood that such counsel
                  need express no opinion as to the financial statements or
                  other financial data contained in the Registration Statements
                  or the Prospectus;

                           (ix) This Agreement has been duly authorized,
                  executed and delivered by the Company; and

                           (x) All of the Offered Securities have been duly
                  authorized and accepted for quotation on the Nasdaq National
                  Market, subject to official notice of issuance;.

                  (e) The Representatives shall have received the opinion
         contemplated in the Power of Attorney, executed and delivered by each
         Selling Stockholder and an opinion, dated such Closing Date, of Foley,
         Hoag & Eliot LLP, or of the respective counsel for the Selling
         Stockholders, to the effect that:

                           (i) Upon the Underwriters obtaining control of the
                  Offered Securities purchased by them from the Selling
                  Stockholder and assuming the Underwriters purchase such shares
                  for value and without notice of an adverse claim to such
                  Offered Securities within the meaning of Section 8-102 of the
                  Uniform Commercial Code as in effect in The Commonwealth of
                  Massachusetts, the Underwriters will have acquired all rights
                  of the Selling Stockholder in such Offered Securities free of
                  any adverse claim, lien, encumbrance or security interest;

                           (ii) No consent, approval, authorization or order of,
                  or filing with, any governmental agency or body or any court
                  is required to be obtained or made by any Selling Stockholder
                  for the consummation of the transactions contemplated by the
                  Custody Agreement or this Agreement in connection with the
                  sale of the Offered Securities sold by the Selling
                  Stockholders, except such as have been obtained or may be
                  required under the Act and such as may be required under state
                  securities laws or the NASD;


                                      -15-
<PAGE>

                           (iii) The execution, delivery and performance of the
                  Custody Agreement, the Power of Attorney and this Agreement
                  and the consummation of the transactions therein and herein
                  contemplated will not result in a breach or violation of any
                  of the terms and provisions of, or constitute a default under
                  the charter or by-laws of any Selling Stockholder which is a
                  corporation, any statute, any rule, regulation or order of any
                  governmental agency or body or any court having jurisdiction
                  over any Selling Stockholder or any of its properties or any
                  agreement or instrument to which any Selling Stockholder is a
                  party or by which any Selling Stockholder is bound or to which
                  any of the properties of any Selling Stockholder is subject;
                  and

                           (iv) The Power of Attorney and related Custody
                  Agreement with respect to each Selling Stockholder has been
                  duly authorized, executed and delivered by such Selling
                  Stockholder and constitute valid and legally binding
                  obligations of each such Selling Stockholder enforceable in
                  accordance with their terms, subject to bankruptcy,
                  insolvency, fraudulent transfer, reorganization, moratorium
                  and similar laws of general applicability relating to or
                  affecting creditors' rights and to general equity principles;
                  and

                           (v) This Agreement has been duly authorized, executed
                  and delivered by each Selling Stockholder.

                  (f) The Representatives shall have received from Testa,
         Hurwitz & Thibeault, LLP, counsel for the Underwriters, such opinion or
         opinions, dated such Closing Date, with respect to the incorporation of
         the Company, the validity of the Offered Securities delivered on such
         Closing Date, the Registration Statements, the Prospectus and other
         related matters as the Representatives may require, and the Selling
         Stockholders and the Company shall have furnished to such counsel such
         documents as they request for the purpose of enabling them to pass upon
         such matters. In rendering such opinion, Testa, Hurwitz & Thibeault,
         LLP may rely as to the incorporation of the Company upon the opinion of
         Foley, Hoag & Eliot LLP.

                  (g) The Representatives shall have received a certificate,
         dated such Closing Date, of the President or any Vice President and a
         principal financial or accounting officer of the Company in which such
         officers, to the best of their knowledge after reasonable
         investigation, shall state that: the representations and warranties of
         the Company in this Agreement are true and correct; the Company has
         complied with all agreements and satisfied all conditions on its part
         to be performed or satisfied hereunder at or prior to such Closing
         Date; no stop order suspending the effectiveness of any Registration
         Statement has been issued and no proceedings for that purpose have been
         instituted or are contemplated by the Commission; the Additional
         Registration Statement (if any) satisfying the requirements of
         subparagraphs (1) and (3) of Rule 462(b) was filed pursuant to Rule
         462(b), including payment of the applicable filing fee in accordance
         with Rule 111(a) or (b) under the Act, prior to the time the Prospectus
         was printed and distributed to any Underwriter; and, subsequent to the
         dates of the most recent financial statements in the Prospectus, there
         has been no material adverse change, nor any development or event
         involving a prospective material adverse change, in the condition
         (financial or other), business, properties or results of operations of
         the Company and its subsidiaries taken as a whole except as set forth
         in or contemplated by the Prospectus or as described in such
         certificate.

                  (h) The Representatives shall have received a letter, dated
         such Closing Date, of PricewaterhouseCoopers LLP which meets the
         requirements of subsection (a) of this Section, except that the
         specified date referred to in such subsection will be a date not more
         than three days prior to such Closing Date for the purposes of this
         subsection.

The Selling Stockholders and the Company will furnish the Representatives with
such conformed copies of such opinions, certificates, letters and documents as
the Representatives reasonably request. CSFBC may in its sole discretion waive
on behalf of the Underwriters compliance with any conditions to the obligations
of the Underwriters


                                      -16-
<PAGE>

hereunder, whether in respect of an Optional Closing Date or otherwise.

         7. INDEMNIFICATION AND CONTRIBUTION. (a) The Company will indemnify and
hold harmless each Underwriter, its partners, directors and officers and each
person, if any who controls such Underwriter within the meaning of Section 15 of
the Act, against any losses, claims, damages or liabilities, joint or several,
to which such Underwriter may become subject, under the Act or otherwise,
insofar as such losses, claims, damages or liabilities (or actions in respect
thereof) arise out of or are based upon any untrue statement or alleged untrue
statement of any material fact contained in any Registration Statement, the
Prospectus, or any amendment or supplement thereto, or any related preliminary
prospectus, or arise out of or are based upon the omission or alleged omission
to state therein a material fact required to be stated therein or necessary to
make the statements therein not misleading, and will reimburse each Underwriter
for any legal or other expenses reasonably incurred by such Underwriter in
connection with investigating or defending any such loss, claim, damage,
liability or action as such expenses are incurred; provided, however, that the
Company will not be liable in any such case to the extent that any such loss,
claim, damage or liability arises out of or is based upon an untrue statement or
alleged untrue statement in or omission or alleged omission from any of such
documents in reliance upon and in conformity with written information furnished
to the Company by any Underwriter through the Representatives specifically for
use therein, it being understood and agreed that the only such information
furnished by any Underwriter consists of the information described as such in
subsection (c) below; and provided, further, that with respect to any untrue
statement or alleged untrue statement in or omission or alleged omission from
any preliminary prospectus the indemnity agreement set forth in this Section
7(a) shall not inure to the benefit of any Underwriter from whom the person
asserting any such losses, claims, damages or liabilities purchased the Offered
Securities, concerned, to the extent that a prospectus relating to such Offered
Securities was required to be delivered by such Underwriter under the Act in
connection with such purchase and any such loss, claim, damage or liability of
such Underwriter results from the fact that there was not sent or given to such
person, at or prior to the written confirmation of the sale of such Offered
Securities to such person, a copy of the Prospectus if the Company had
previously furnished copies thereof to such Underwriter.

         (b) (1) If the Selling Stockholder is Joseph J. Allaire or David J.
Orfao, such Selling Stockholder, jointly and severally, will indemnify and
hold harmless each Underwriter, its partners, directors and officers and each
person who controls such Underwriter within the meaning of Section 15 of the
Act, against any losses, claims, damages or liabilities, joint or several, to
which such Underwriter may become subject, under the Act or otherwise,
insofar as such losses, claims, damages or liabilities (or actions in respect
thereof) arise out of or are based upon any untrue statement or alleged
untrue statement of any material fact contained in any Registration
Statement, the Prospectus, or any amendment or supplement thereto, or any
related preliminary prospectus, or arise out of or are based upon the
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading,
and will reimburse each Underwriter for any legal or other expenses
reasonably incurred by such Underwriter in connection with investigating or
defending any such loss, claim, damage, liability or action as such expenses
are incurred; provided, however, that (i) such Selling Stockholder's
liability, in any case, shall not exceed such Selling Stockholder's gross
proceeds from his, her or its sale of Securities hereunder and (ii) such
Selling Stockholder will not be liable in any such case to the extent that
any such loss, claim, damage or liability arises out of or is based upon an
untrue statement or alleged untrue statement in or omission or alleged
omission from any of such documents in reliance upon and in conformity with
written information furnished to the Company by an Underwriter through the
Representatives specifically for use therein, it being understood and agreed
that the only such information furnished by any Underwriter consists of the
information described as such in subsection (c) below; and provided, further,
that with respect to any untrue statement or alleged untrue statement in or
omission or alleged omission from any preliminary prospectus the indemnity
agreement set forth in this Section 7(b)(1) shall not inure to the benefit of
any Underwriter from whom the person asserting any such losses, claims,
damages or liabilities purchased the Offered Securities, concerned, to the
extent that a prospectus relating to such Offered Securities was required to
be delivered by such Underwriter under the Act in connection with such
purchase and any such loss, claim, damage or liability of such Underwriter
results from the fact that there was not sent or given to such person, at or
prior to the written confirmation of the sale of such Offered Securities to
such person, a copy of the Prospectus if the

                                      -17-
<PAGE>

Company had previously furnished copies thereof to such Underwriter.

            (2) Each of the Selling Stockholders other than Joseph J. Allaire
or David J. Orfao, will severally and not jointly, indemnify and hold
harmless each Underwriter, its partners, directors and officers and each
person who controls such Underwriter within the meaning of Section 15 of the
Act, against any losses, claims, damages or liabilities, joint or several, to
which such Underwriter may become subject, under the Act or otherwise,
insofar as such losses, claims, damages or liabilities (or actions in respect
thereof) arise out of or are based upon any untrue statement or alleged
untrue statement of any material fact contained in any Registration
Statement, the Prospectus, or any amendment or supplement thereto, or any
related preliminary prospectus, or arise out of or are based upon the
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading, to
the extent, but only to the extent, that such untrue statement or alleged
untrue statement or omission or alleged omission was made in reliance upon
and in conformity with written information furnished to the Company or such
Underwriter by such Selling Stockholder, directly or through such Selling
Stockholder's representatives, specifically for use therein, and will
reimburse each Underwriter for any legal or other expenses reasonably
incurred by such Underwriter in connection with investigating or defending
any such loss, claim, damage, liability or action as such expenses are
incurred; provided, however, that (i) such Selling Stockholder's liability,
in any case, shall not exceed such Selling Stockholder's gross proceeds from
his, her or its sale of Securities hereunder and (ii) such Selling
Stockholder will not be liable in any such case to the extent that any such
loss, claim, damage or liability arises out of or is based upon an untrue
statement or alleged untrue statement in or omission or alleged omission from
any of such documents in reliance upon and in conformity with written
information furnished to the Company by an Underwriter through the
Representatives specifically for use therein, it being understood and agreed
that the only such information furnished by any Underwriter consists of the
information described as such in subsection (c) below; and provided, further,
that with respect to any untrue statement or alleged untrue statement in or
omission or alleged omission from any preliminary prospectus the indemnity
agreement set forth in this Section 7(b)(2) shall not inure to the benefit of
any Underwriter from whom the person asserting any such losses, claims,
damages or liabilities purchased the Offered Securities, concerned, to the
extent that a prospectus relating to such Offered Securities was required to
be delivered by such Underwriter under the Act in connection with such
purchase and any such loss, claim, damage or liability of such Underwriter
results from the fact that there was not sent or given to such person, at or
prior to the written confirmation of the sale of such Offered Securities to
such person, a copy of the Prospectus if the Company had previously furnished
copies thereof to such Underwriter.

         (c) Each Underwriter will severally and not jointly indemnify and hold
harmless the Company, its directors and officers and each person, if any, who
controls the Company within the meaning of Section 15 of the Act, and each
Selling Stockholder against any losses, claims, damages or liabilities to which
the Company or such Selling Stockholder may become subject, under the Act or
otherwise, insofar as such losses, claims, damages or liabilities (or actions in
respect thereof) arise out of or are based upon any untrue statement or alleged
untrue statement of any material fact contained in any Registration Statement,
the Prospectus, or any amendment or supplement thereto, or any related
preliminary prospectus, or arise out of or are based upon the omission or the
alleged omission to state therein a material fact required to be stated therein
or necessary to make the statements therein not misleading, in each case to the
extent, but only to the extent, that such untrue statement or alleged untrue
statement or omission or alleged omission was made in reliance upon and in
conformity with written information furnished to the Company by such Underwriter
through the Representatives specifically for use therein, and will reimburse any
legal or other expenses reasonably incurred by the Company and each Selling
Stockholder in connection with investigating or defending any such loss, claim,
damage, liability or action as such expenses are incurred, it being understood
and agreed that the only such information furnished by any Underwriter consists
of (i) the table under the first paragraph under the caption "Underwriting,"
(ii) the concession and reallowance figures appearing in the fourth paragraph
under the caption "Underwriting," (iii) the information contained in the sixth,
tenth and eleventh paragraphs under the caption "Underwriting," and (iv) the
information set forth under the caption "Notice to Canadian Residents.".

         (d) Promptly after receipt by an indemnified party under this Section
of notice of the commencement of any


                                      -18-
<PAGE>

action, such indemnified party will, if a claim in respect thereof is to be made
against an indemnifying party under subsection (a), (b) or (c) above, notify the
indemnifying party of the commencement thereof; but the omission so to notify
the indemnifying party will not relieve it from any liability which it may have
to any indemnified party otherwise than under subsection (a), (b) or (c) above.
In case any such action is brought against any indemnified party and it notifies
an indemnifying party of the commencement thereof, the indemnifying party will
be entitled to participate therein and, to the extent that it may wish, jointly
with any other indemnifying party similarly notified, to assume the defense
thereof, with counsel satisfactory to such indemnified party (who shall not,
except with the consent of the indemnified party, be counsel to the indemnifying
party), and after notice from the indemnifying party to such indemnified party
of its election so to assume the defense thereof, the indemnifying party will
not be liable to such indemnified party under this Section for any legal or
other expenses subsequently incurred by such indemnified party in connection
with the defense thereof other than reasonable costs of investigation. No
indemnifying party shall, without the prior written consent of the indemnified
party, effect any settlement of any pending or threatened action in respect of
which any indemnified party is or could have been a party and indemnity could
have been sought hereunder by such indemnified party unless such (i) settlement
includes an unconditional release of such indemnified party from all liability
on any claims that are the subject matter of such action and (ii) does not
include a statement as to, or an admission of, fault, culpability or a failure
to act by or on behalf of such indemnified party.

         (e) If the indemnification provided for in this Section would by its
terms, provide for indemnification for an indemnified party and is unavailable
or insufficient to hold harmless an indemnified party under subsection (a), (b)
or (c) above, then each indemnifying party shall contribute to the amount paid
or payable by such indemnified party as a result of the losses, claims, damages
or liabilities referred to in subsection (a), (b) or (c) above (i) in such
proportion as is appropriate to reflect the relative benefits received by the
Company and the Selling Stockholders on the one hand and the Underwriters on the
other from the offering of the Securities or (ii) if the allocation provided by
clause (i) above is not permitted by applicable law, in such proportion as is
appropriate to reflect not only the relative benefits referred to in clause (i)
above but also the relative fault of the Company and the Selling Stockholders on
the one hand and the Underwriters on the other in connection with the statements
or omissions which resulted in such losses, claims, damages or liabilities as
well as any other relevant equitable considerations. The relative benefits
received by the Company and the Selling Stockholders on the one hand and the
Underwriters on the other shall be deemed to be in the same proportion as the
total net proceeds from the offering (before deducting expenses) received by the
Company and the Selling Stockholders bear to the total underwriting discounts
and commissions received by the Underwriters. The relative fault shall be
determined by reference to, among other things, whether the untrue or alleged
untrue statement of a material fact or the omission or alleged omission to state
a material fact relates to information supplied by the Company, the Selling
Stockholders or the Underwriters and the parties' relative intent, knowledge,
access to information and opportunity to correct or prevent such untrue
statement or omission. The amount paid by an indemnified party as a result of
the losses, claims, damages or liabilities referred to in the first sentence of
this subsection (e) shall be deemed to include any legal or other expenses
reasonably incurred by such indemnified party in connection with investigating
or defending any action or claim which is the subject of this subsection (e).
Notwithstanding the provisions of this subsection (e), no Selling Stockholder
shall be required to contribute any amount in excess of such Selling
Stockholder's gross proceeds from his, her or its sale of Securities hereunder
and no Underwriter shall be required to contribute any amount in excess of the
amount by which the total price at which the Securities underwritten by it and
distributed to the public were offered to the public exceeds the amount of any
damages which such Underwriter has otherwise been required to pay by reason of
such untrue or alleged untrue statement or omission or alleged omission. No
person guilty of fraudulent misrepresentation (within the meaning of Section
11(f) of the Act) shall be entitled to contribution from any person who was not
guilty of such fraudulent misrepresentation. The Underwriters' obligations in
this subsection (e) to contribute are several in proportion to their respective
underwriting obligations and not joint. The Selling Stockholders' obligations in
this subsection (e) to contribute are several in proportion to their respective
offering proceeds and not joint. Notwithstanding the foregoing, if the
indemnification and contribution provided in this section by any Selling
Stockholder is unavailable or insufficient to hold harmless an indemnified party
under subsection (a), (b) or (c) above or any Selling Stockholders do not
contribute as required above, then the Company shall contribute any amounts not
contributed by such Selling Stockholders.


                                      -19-
<PAGE>

         (f) The obligations of the Company and the Selling Stockholders under
this Section shall be in addition to any liability which the Company and the
Selling Stockholders may otherwise have and shall extend, upon the same terms
and conditions, to each person, if any, who controls any Underwriter (as
hereinafter defined) within the meaning of the Act; and the obligations of the
Underwriters under this Section shall be in addition to any liability which the
respective Underwriters may otherwise have and shall extend, upon the same terms
and conditions, to each director of the Company, to each officer of the Company
who has signed a Registration Statement and to each person, if any, who controls
the Company within the meaning of the Act.

         8. DEFAULT OF UNDERWRITERS. If any Underwriter or Underwriters default
in their obligations to purchase Offered Securities hereunder on either the
First or any Optional Closing Date and the aggregate number of shares of Offered
Securities that such defaulting Underwriter or Underwriters agreed but failed to
purchase does not exceed 10% of the total number of shares of Offered Securities
that the Underwriters are obligated to purchase on such Closing Date, CSFBC may
make arrangements satisfactory to the Company and the Selling Stockholders for
the purchase of such Offered Securities by other persons, including any of the
Underwriters, but if no such arrangements are made by such Closing Date, the
non-defaulting Underwriters shall be obligated severally, in proportion to their
respective commitments hereunder, to purchase the Offered Securities that such
defaulting Underwriters agreed but failed to purchase on such Closing Date. If
any Underwriter or Underwriters so default and the aggregate number of shares of
Offered Securities with respect to which such default or defaults occur exceeds
10% of the total number of shares of Offered Securities that the Underwriters
are obligated to purchase on such Closing Date and arrangements satisfactory to
CSFBC, the Company and the Selling Stockholders for the purchase of such Offered
Securities by other persons are not made within 36 hours after such default,
this Agreement will terminate without liability on the part of any
non-defaulting Underwriter, the Company or the Selling Stockholders, except as
provided in Section 9 (provided that if such default occurs with respect to
Optional Securities after the First Closing Date, this Agreement will not
terminate as to the Firm Securities or any Optional Securities purchased prior
to such termination). As used in this Agreement, the term "Underwriter" includes
any person substituted for an Underwriter under this Section. Nothing herein
will relieve a defaulting Underwriter from liability for its default.

         9. SURVIVAL OF CERTAIN REPRESENTATIONS AND OBLIGATIONS. The respective
indemnities, agreements, representations, warranties and other statements of the
Selling Stockholders, of the Company or its officers and of the several
Underwriters set forth in or made pursuant to this Agreement will remain in full
force and effect, regardless of any investigation, or statement as to the
results thereof, made by or on behalf of any Underwriter, any Selling
Stockholder, the Company or any of their respective representatives, officers or
directors or any controlling person, and will survive delivery of and payment
for the Offered Securities. If this Agreement is terminated pursuant to Section
8 or if for any reason the purchase of the Offered Securities by the
Underwriters is not consummated, the Company shall remain responsible for the
expenses to be paid or reimbursed by it pursuant to Section 5 and the respective
obligations of the Company, the Selling Stockholders and the Underwriters
pursuant to Section 7 and the obligations of the Company, the Selling
Stockholders pursuant to Section 9 shall remain in effect, and if any Offered
Securities have been purchased hereunder the representations and warranties in
Section 2 and all obligations under Section 5 shall also remain in effect. If
the purchase of the Offered Securities by the Underwriters is not consummated
for any reason other than solely because of the termination of this Agreement
pursuant to Section 8 or the occurrence of any event specified in clause (iii),
(iv) or (v) of Section 6(c), the Company will reimburse the Underwriters for all
out-of-pocket expenses (including fees and disbursements of counsel) reasonably
incurred by them in connection with the offering of the Offered Securities.

         10. NOTICES. All communications hereunder will be in writing and, if
sent to the Underwriters, will be mailed, delivered or telegraphed and confirmed
to the Representatives, c/o Credit Suisse First Boston Corporation, Eleven
Madison Avenue, New York, N.Y. 10010-3629, Attention: Investment Banking
Department Transactions Advisory Group, or, if sent to the Company, will be
mailed, delivered or telegraphed and confirmed to it at Allaire Corporation, One
Alewife Center, Cambridge, Massachusetts 02140, Attention: David J. Orfao, or,
if sent to the Selling Stockholders or any of them, will be mailed, delivered or
telegraphed and confirmed to David J. Orfao and David A. Gerth at c/o


                                      -20-
<PAGE>

Allaire Corporation, One Alewife Center, Cambridge, Massachusetts 02140;
provided, however, that any notice to an Underwriter pursuant to Section 7 will
be mailed, delivered or telegraphed and confirmed to such Underwriter.

         11. SUCCESSORS. This Agreement will inure to the benefit of and be
binding upon the parties hereto and their respective personal representatives
and successors and the officers and directors and controlling persons referred
to in Section 7, and no other person will have any right or obligation
hereunder.

         12. REPRESENTATION. The Representatives will act for the several
Underwriters in connection with the transactions contemplated by this Agreement,
and any action under this Agreement taken by the Representatives jointly or by
CSFBC will be binding upon all the Underwriters. David J. Orfao and David A.
Gerth will act for the Selling Stockholders in connection with such
transactions, an, subject to the terms of the Power of Attorney, any action
under or in respect of this Agreement taken by David J. Orfao and David A. Gerth
will be binding upon all the Selling Stockholders.

         13. COUNTERPARTS. This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original, but all such
counterparts shall together constitute one and the same Agreement.

         14. APPLICABLE LAW. This Agreement shall be governed by, and construed
in accordance with, the laws of the State of New York, without regard to
principles of conflicts of laws.

         The Company hereby submits to the non-exclusive jurisdiction of the
Federal and state courts in the Borough of Manhattan in The City of New York in
any suit or proceeding arising out of or relating to this Agreement or the
transactions contemplated hereby. The Company irrevocably appoints David J.
Orfao and David A. Gerth, as its authorized agent in the Borough of Manhattan in
The City of New York upon which process may be served in any such suit or
proceeding, and agrees that service of process upon such agent, and written
notice of said service to the Company by the person serving the same to the
address provided in Section 10, shall be deemed in every respect effective
service of process upon the Company in any such suit or proceeding. The Company
further agrees to take any and all action as may be necessary to maintain such
designation and appointment of such agent in full force and effect for a period
of seven years from the date of this Agreement.


                                      -21-
<PAGE>

         If the foregoing is in accordance with the Representatives'
understanding of our agreement, kindly sign and return to the Company one of the
counterparts hereof, whereupon it will become a binding agreement among the
Selling Stockholders, the Company and the several Underwriters in accordance
with its terms.

                               Very truly yours,

                               ALLAIRE CORPORATION

                               By ___________________________________
                                  David J. Orfao, President

The foregoing Underwriting Agreement is hereby confirmed and accepted as of the
  date first above written.

     CREDIT SUISSE FIRST BOSTON CORPORATION
     BANCBOSTON ROBERTSON STEPHENS
     DAIN RAUSCHER WESSELS, A DIVISION OF
       DAIN RAUSCHER INCORPORATED



         Acting on behalf of themselves and as the  Representatives
           of the several
           Underwriters

     By  CREDIT SUISSE FIRST BOSTON CORPORATION

       By _______________________________________
          Joseph D. Fashano
          Director


                            ______________________________________
                            David J. Orfao as Attorney-in-Fact for
                            the Selling Stockholders


                            _______________________________________
                            David A. Gerth as Attorney-in-Fact for
                            the Selling Stockholders


                                      -22-
<PAGE>

                                   SCHEDULE A

<TABLE>
<CAPTION>
                                                                                               NUMBER OF
                                                                            NUMBER OF          OPTIONAL
                                                                         FIRM SECURITIES     SECURITIES TO
                          SELLING STOCKHOLDER                              TO BE SOLD           BE SOLD
                          -------------------                            ---------------     -------------
<S>                                                                    <C>                   <C>
Joseph J. Allaire.................................................       200,000
Entities affiliated with..........................................       450,000
     Polaris Venture Management Co., LLC
     1000 Winter Street, Suite 3350
     Waltham, MA 02154

BancBoston Ventures Inc...........................................       300,000
     175 Federal Street
     Boston, MA 02110
David J. Orfao....................................................       100,000
Jack P. Lull......................................................        27,554
John J. Gannon....................................................         5,000
     1000 Winter Street, Suite 3350
     Waltham, MA 02154
Thomas A. Herring.................................................
     1000 Winter Street, Suite 3350
     Waltham, MA 02154
US West Pension Trust                                                    222,616
US West Benefit Assurance Trust                                           74,205
MC Silicon Valley, Inc.                                                   15,625
                                                                       ---------

  Total............................................................    1,400,000
                                                                       ---------
                                                                       ---------
</TABLE>


                                      -23-
<PAGE>

                                   SCHEDULE B

<TABLE>
<CAPTION>
                                                                                         NUMBER OF
                                                                                      FIRM SECURITIES
                  UNDERWRITER                                                         TO BE PURCHASED
                  -----------                                                         ---------------
<S>                                                                                   <C>
Credit Suisse First Boston Corporation.......................................
BancBoston Robertson Stephens
Dain Rauscher Wessels
















                                                                                        ----------
                           Total.............................................
                                                                                        ----------
                                                                                        ----------
</TABLE>

<PAGE>

                                                            EXHIBIT 5.1

                                 [LETTERHEAD]


                             September 24, 1999


Allaire Corporation
One Alewife Center
Cambridge, Massachusetts 02140


Ladies and Gentlemen:

     We are familiar with the Registration Statement on Form S-1
(Registration No. 333-86563), as amended by Amendment No. 1 and Amendment No.
2 thereto (as amended, the "Registration Statement"), filed by Allaire
Corporation, a Delaware corporation (the "Company"), with the Securities and
Exchange Commission under the Securities Act of 1933, as amended. The
Registration Statement relates to the proposed public offering by the Company
of up to 1,150,000 shares (the "Company Shares") of its Common Stock, $.01
par value per share (the "Common Stock") to be issued by the Company and to
the proposed public offering by certain stockholders of the Company (the
"Selling Stockholders") of up to 1,610,000 additional shares (the
"Stockholder Shares") of such Common Stock. (The foregoing number of Company
Shares and Stockholder Shares assumes the exercise in full of the
over-allotment option described in the Registration Statement.)

     We are familiar with the Company's Amended and Restated Certificate of
Incorporation, its Amended and Restated By-Laws, the records of meetings and
consents of its Board of Directors and of its stockholders provided to us by
the Company, and its stock records. In addition, we have examined and relied
on the originals or copies certified or otherwise identified to our
satisfaction of all such corporate records of the Company and such other
instruments and other certificates of public officials, officers and
representatives of the Company and such other persons, and we have made such
investigations of law, as we have deemed appropriate as a basis for the
opinions expressed below.

     Based on the foregoing, it is our opinion that:

     1.   The Company has corporate power adequate for the issuance of the
Company Shares in accordance with the Registration Statement. The Company has
taken all necessary corporate

<PAGE>

Allaire Corporation
September 24, 1999
Page 2

action required to authorize the issuance and sale of the Company Shares.
When certificates for the Company Shares have been duly executed and
countersigned, and delivered against due receipt of consideration therefor as
described in the Registration Statement, the Company Shares will be legally
issued, fully paid and non-assessable.

     2.   Upon the due execution, countersignature and delivery of
certificates for the Stockholder Shares, the Stockholder Shares will be
legally issued, fully paid and non-assessable.

     We consent to the filing of this opinion as an exhibit to the
Registration Statement and to the reference to us under the heading "Legal
Matters" in the prospectus forming part of the Registration Statement.


                                       Very truly yours,

                                       Foley, Hoag & Elliot LLP

                                       By: /s/ William R. Kolb
                                          --------------------------
                                           A Partner



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