December 23rd, 1996



J.J. Allaire
Allaire Corp.
One Alewife Center
Cambridge, MA 02140


David Orfao
17 Bartkus Farm Road
Concord, MA 01742


Dear David:

I am very pleased to extend an offer to you to join the Allaire team as Chief
Executive Officer and a member of the Board of Directors. I strongly believe
that we will make a great team and that you will provide Allaire with exactly
the kind of leadership and direction it needs to become fantastically
successful.

As CEO you will be responsible for Allaire's overall operation. This will
include but is not limited to sales, marketing, service, finance, and product
development. I expect that you would join Allaire full time no later than
February 15th, 1997.

We have structured a compensation package that consists of five components:
salary, incentive plan, stock options, benefits, and severance.

1.       Salary

         Base salary of $160,000, paid bi-weekly.

2.       Incentive Plan

         The incentive compensation for achieving 100% of your targeted
         objectives will be $60,000 per annum. Incentive payments may be made
         either in cash or stock at your discretion (the price of the stock will
         be determined by the most recently completed round of investment). The
         Board of Directors will map out the objectives upon which this bonus
         will be based once you start your employment.

3.       Stock Options

         The company will grant you participation in the 1996 stock option plan.
         You will receive options which will vest over time on shares equal to
         7% of the company's fully diluted





         capitalization. Allaire expects to sell and issue additional shares of
         capital stock to Polaris Ventures on or about December 31st, 1996 and
         to increase its pool of stock available for the grant of options or
         sale of restricted stock to key employees, at about the same time. In
         either event we will revise your option or grant additional options to
         you to assure that your option(s) represent 7% of Allaire's
         fully-diluted capitalization as it may be increased by either or both
         actions.

         The option price is currently $1 and signing this agreement will lock
         you into this price. Vesting will occur over a 4 year period, with the
         first 25% to vest 1 year after the first day of employment and an
         additional 1/36th of the balance to vest at the end of each month
         during which you are employed by Allaire after the first year.

         In the event of a change of control (a single transaction or series of
         related transactions in which another party becomes the majority
         stockholder of Allaire or acquires substantially all of its assets) in
         which you are not offered a comparable position and title, the
         remaining balance of your shares will immediately vest.

4.       Benefits

         You will be eligible to participate in the standard company benefits
         plans. Our medical plan is with Massachusetts Blue Cross Blue Shield
         and our dental plan is with Delta Dental. The company currently pays
         100% of the premium for these plans. The company plans to implement
         life insurance, long-term disability, and 401K plans during the first
         quarter of 1997. You will be eligible to participate in these plans
         when they are available.

5.       Severance

         Although we hope that the employment relationship will be mutually
         satisfactory, your employment with Allaire is 'at will'. This means
         that your employment is for no specific period of time, however in the
         event you are involuntarily terminated for reasons other than cause,
         you will receive continuing base salary and benefits (or cash payments
         equivalent to applicable premiums) for 12 months.

You understand and agree that no facts or circumstances arising out of
employment, including length of employment or any conduct by the company,
including any express or implied agreements, can alter the at will employment
relationship unless specifically set forth in writing and signed by you and
approved by the Board of Directors.

This letter sets forth, fully, all understandings and agreements between you and
Allaire regarding your employment. Please acknowledge your acceptance of our
offer by signing and dating this letter and returning it to me no later than
Friday, December 27th, 1997.

This letter agreement and your employment will take effect upon the occurrence
of a change of control of SQA, Inc. that causes vesting of your SQA stock
options to accelerate with respect to





50% of the unvested portions thereof, as provided in your letter agreement with
SQA dated November 8, 1995. If such event has not occurred by March 15, 1997
Allaire may terminate this letter agreement by written notice to you and
thereupon both parties shall cease to have any obligations to the other under
this letter agreement or otherwise.

Once again, I want to welcome you aboard with Allaire Corp. The board, the team,
and I are very excited about working with you and are confident that you will
bring us all to a new level of success.

Sincerely,


                                                /s/ David Orfao
J.J. Allaire                                    -------------------------------
Chairman                                        David Orfao


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