UNISON SOFTWARE INC
8-K, 1997-09-18
PREPACKAGED SOFTWARE
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<PAGE>


                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT


                       Pursuant to Section 13 or 15(d) of
                       the Securities Exchange Act of 1934


                Date of Report (Date of earliest event reported)

                               September 12, 1997


                              UNISON SOFTWARE, INC.
               --------------------------------------------------
               (Exact Name of Registrant as Specified in Charter)


                                    Delaware
               --------------------------------------------------
                 (State or other jurisdiction of incorporation)

                  000-26198                          94-2696878
            ---------------------     -----------------------------------
            (Commission File No.)     (IRS Employer Identification Number)



                            5101 Patrick Henry Drive
                          Santa Clara, California 95054
               --------------------------------------------------
                    (Address of Principal Executive Offices)



                                 (408) 988-2800
               --------------------------------------------------
              (Registrant's Telephone Number, Including Area Code)


<PAGE>

Item 2.   ACQUISITION AND DISPOSITION OF ASSETS

     The Company has agreed to be acquired by a subsidiary of International 
Business Machines Corporation ("IBM") pursuant an Agreement and Plan of 
Merger (the "Merger Agreement") dated as of September 12, 1997.  Under the 
terms of the Merger Agreement, IBM will acquire for $15.00 per share all 
outstanding shares of Company common stock and will assume all options to 
acquire shares of Company common stock.  The merger is being accounted for as 
a purchase and is intended to qualify as a tax free reorganization (except to 
the extent Unison stockholders elect to receive cash in respect of their 
shares of Company common stock).  Company stockholders may elect to receive, 
for all or part of their shares of Company common stock, cash or shares of 
IBM common stock, except that no more than 50% of the total transaction value 
will be paid in cash. If Company stockholders elect to receive cash in an 
aggregate amount in excess of 50% of the total transaction value, the Merger 
Agreement provides for a proration such that Company stockholders making the 
cash election will receive on a ratable basis cash and shares of IBM common 
stock in respect of those shares for which a cash election was made.  There 
is no limit on the number of IBM shares of common stock issuable in the 
transaction.  Company stockholders making a stock election in respect of all 
or a portion of their shares of Company common stock will be entitled to 
receive in exchange for each share of Company common stock for which a stock 
election is made a number of shares of IBM common stock equal to the Exchange 
Ratio.  The "Exchange Ratio" is a fraction, the numerator of which is $15.00 
and the denominator of which is the average closing sales price of IBM common 
stock over the 10 trading days immediately preceding the second trading day 
prior to the closing of the transaction.

     The closing of this transaction is subject to certain conditions, 
including antitrust clearance under the Hart-Scott-Rodino Antitrust 
Improvement Act of 1976, and approval by the Company's stockholders.  The 
Company's two largest stockholders, who are also officers and directors of 
the Company, have agreed, among other things, to (i) vote their shares 
(representing approximately 32% of the Company's outstanding common stock) in 
favor of the merger and (ii) make a stock election in respect of at least 85% 
of their shares of Company common stock.



                                     -2-

<PAGE>

Item 7.   FINANCIAL STATEMENTS AND EXHIBITS

     (c)  Exhibit Number  Description
          --------------  -----------
               2.1        Agreement and Plan of Reorganization dated as of
                          September 12, 1997 by and among International 
                          Business Machines Corporation, New Orchard Corp. 
                          and Unison Software, Inc., including certain 
                          exhibits thereto;

               2.2        Stockholders Agreement dated as of September 12, 1997
                          among International Business Machines Corporation,
                          Donald Lee and Michael Casteel; and

               99.1       Press release, dated September 15, 1997, announcing 
                          the acquisition of Unison Software, Inc. by 
                          International Business Machines Corporation.



                                     -3-

<PAGE>

                                    SIGNATURE


     Pursuant to the requirements of the Securities Exchange Act of 1934, the 
Registrant has duly caused this report to be signed on its behalf by the 
undersigned hereunto duly authorized.

                                   UNISON SOFTWARE, INC.


Dated:  September 12, 1997         By:  /s/ Richard J. Armitage       
                                      --------------------------------------
                                         Richard J. Armitage
                                         Chief Financial Officer




                                     -4-

<PAGE>

                                  EXHIBIT INDEX


Exhibit Number  Description
- --------------  -----------
     2.1        Agreement and Plan of Reorganization dated as of September 12,
                1997 by and among International Business Machines Corporation,
                New Orchard Corp. and Unison Software, Inc., including certain
                exhibits thereto;

     2.2        Stockholders Agreement dated as of September 12, 1997 among
                International Business Machines Corporation, Donald Lee and
                Michael Casteel; and

     99.1       Press release, dated September 15, 1997, announcing the
                acquisition of Unison Software, Inc. by International Business
                Machines Corporation.




                                     -5-



<PAGE>

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

                          AGREEMENT AND PLAN OF MERGER



                         Dated as of September 12, 1997



                                      Among


                             INTERNATIONAL BUSINESS 
                              MACHINES CORPORATION,


                                NEW ORCHARD CORP.


                                       And


                              UNISON SOFTWARE, INC.

- ----------------------------------------------------------------------------
- ----------------------------------------------------------------------------
<PAGE>

                                TABLE OF CONTENTS


                                                                           Page
                                                                           ----

                                   ARTICLE I

                                   The Merger

SECTION 1.01.  The Merger. . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SECTION 1.02.  Closing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SECTION 1.03.  Effective Time. . . . . . . . . . . . . . . . . . . . . . . . . 2
SECTION 1.04.  Effects of the Merger . . . . . . . . . . . . . . . . . . . . . 2
SECTION 1.05.  Certificate of Incorporation and By-Laws. . . . . . . . . . . . 2
SECTION 1.06.  Directors . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SECTION 1.07.  Officers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3


                                   ARTICLE II

                EFFECT OF THE MERGER ON THE CAPITAL STOCK OF THE
               CONSTITUENT CORPORATIONS; EXCHANGE OF CERTIFICATES

SECTION 2.01.  Effect on Capital Stock . . . . . . . . . . . . . . . . . . . . 3
SECTION 2.02.  Exchange of Certificates. . . . . . . . . . . . . . . . . . . . 6
SECTION 2.03.  Elections . . . . . . . . . . . . . . . . . . . . . . . . . . . 9


                                  ARTICLE III

                        REPRESENTATIONS AND WARRANTIES

SECTION 3.01.  Representations and Warranties 
                 of the Company. . . . . . . . . . . . . . . . . . . . . . . .11
SECTION 3.02.  Representations and Warranties 
                 of Parent and Sub . . . . . . . . . . . . . . . . . . . . . .29


                                   ARTICLE IV

                   COVENANTS RELATING TO CONDUCT OF BUSINESS

SECTION 4.01.  Conduct of Business . . . . . . . . . . . . . . . . . . . . . .33
SECTION 4.02.  No Solicitation . . . . . . . . . . . . . . . . . . . . . . . .38

<PAGE>

                                                                             ii

                                                                           Page
                                                                           ----

                                   ARTICLE V

                              ADDITIONAL AGREEMENTS

SECTION 5.01.  Preparation of the Form S-4 and the Proxy Statement; 
                 Stockholders Meeting  . . . . . . . . . . . . . . . . . . . .40
SECTION 5.02.  Letters of the Company's Accountants. . . . . . . . . . . . . .41
SECTION 5.03.  Letters of Parent's Accountants . . . . . . . . . . . . . . . .41
SECTION 5.04.  Access to Information; Confidentiality. . . . . . . . . . . . .41
SECTION 5.05.  Reasonable Efforts; Notification. . . . . . . . . . . . . . . .42
SECTION 5.06.  Stock Options . . . . . . . . . . . . . . . . . . . . . . . . .43
SECTION 5.07.  Indemnification . . . . . . . . . . . . . . . . . . . . . . . .45
SECTION 5.08.  Fees and Expenses . . . . . . . . . . . . . . . . . . . . . . .46
SECTION 5.09.  Public Announcements. . . . . . . . . . . . . . . . . . . . . .48
SECTION 5.10.  Affiliates. . . . . . . . . . . . . . . . . . . . . . . . . . .48
SECTION 5.11.  Stock Exchange Listing. . . . . . . . . . . . . . . . . . . . .48
SECTION 5.12.  Stockholder Agreement Legend. . . . . . . . . . . . . . . . . .48
SECTION 5.13.  Tax Treatment . . . . . . . . . . . . . . . . . . . . . . . . .49


                               ARTICLE VI

                          CONDITIONS PRECEDENT

SECTION 6.01.  Conditions to Each Party's Obligation to 
                 Effect the Merger . . . . . . . . . . . . . . . . . . . . . .50
SECTION 6.02.  Conditions to Obligations of Parent
                 and Sub . . . . . . . . . . . . . . . . . . . . . . . . . . .51
SECTION 6.03.  Conditions to Obligation of the Company . . . . . . . . . . . .52
SECTION 6.04.  Frustration of Closing Conditions . . . . . . . . . . . . . . .53


                               ARTICLE VII

                    TERMINATION, AMENDMENT AND WAIVER

SECTION 7.01.  Termination . . . . . . . . . . . . . . . . . . . . . . . . . .53
SECTION 7.02.  Effect of Termination . . . . . . . . . . . . . . . . . . . . .55
SECTION 7.03.  Amendment . . . . . . . . . . . . . . . . . . . . . . . . . . .55
SECTION 7.04.  Extension; Waiver . . . . . . . . . . . . . . . . . . . . . . .56


                              ARTICLE VIII

                           GENERAL PROVISIONS

SECTION 8.01.  Nonsurvival of Representations and 
                 Warranties. . . . . . . . . . . . . . . . . . . . . . . . . .56
SECTION 8.02.  Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
SECTION 8.03.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . . .57
SECTION 8.04.  Interpretation. . . . . . . . . . . . . . . . . . . . . . . . .58
SECTION 8.05.  Counterparts. . . . . . . . . . . . . . . . . . . . . . . . . .58
<PAGE>

                                                                            iii

                                                                           Page
                                                                           ----

SECTION 8.06.  Entire Agreement; No Third-Party 
                 Beneficiaries . . . . . . . . . . . . . . . . . . . . . . . .58
SECTION 8.07.  Governing Law . . . . . . . . . . . . . . . . . . . . . . . . .59
SECTION 8.08.  Assignment. . . . . . . . . . . . . . . . . . . . . . . . . . .59
SECTION 8.09.  Enforcement . . . . . . . . . . . . . . . . . . . . . . . . . .59
SECTION 8.10.  Severability. . . . . . . . . . . . . . . . . . . . . . . . . .60
<PAGE>

                  AGREEMENT AND PLAN OF MERGER dated as of September 12, 1997,
             among INTERNATIONAL BUSINESS MACHINES CORPORATION, a New York
             corporation ("Parent"), NEW ORCHARD CORP., a Delaware corporation
             and a wholly owned subsidiary of Parent ("Sub"), and UNISON
             SOFTWARE, INC., a Delaware corporation (the "Company").


          WHEREAS, the respective Boards of Directors of Parent, Sub and the 
Company, and Parent, acting as the sole stockholder of Sub, have approved the 
merger of the Company with and into Sub (the "Merger"), upon the terms and 
subject to the conditions set forth in this Agreement;

          WHEREAS, substantially concurrently herewith and as a condition and 
inducement to Parent's willingness to enter into this Agreement, Parent and 
certain stockholders (the "Principal Stockholders") of the Company have 
entered into a Stockholder Agreement (the "Stockholder Agreement");

          WHEREAS, substantially concurrently herewith and as a condition and 
inducement to Parent's willingness to enter into this Agreement, Parent and 
certain stockholders of the Company who are employed by the Company have 
entered into Noncompetition Agreements (the "Noncompetition Agreements") 
pursuant to which such stockholders have, among other things, agreed to not 
have certain Relationships (as defined in the Noncompetition Agreements) with 
certain third parties during the Noncompetition Period (as defined in the 
Noncompetition Agreements);

          WHEREAS, Parent, Sub and the Company desire to make certain 
representations, warranties, covenants and agreements in connection with the 
Merger and also to prescribe various conditions to the Merger;

          WHEREAS, for United States Federal income tax purposes, it is 
intended that the Merger shall qualify as a reorganization within the meaning 
of Section 368 of the Internal Revenue Code of 1986, as amended (the "Code"); 
and

          NOW, THEREFORE, in consideration of the representations, 
warranties, covenants and agreements contained in this Agreement, the parties 
hereto agree as follows:
<PAGE>

                                                                             2

                                    ARTICLE I

                                   THE MERGER

          SECTION 1.01.  THE MERGER.  Upon the terms and subject to the 
conditions set forth in this Agreement, and in accordance with the Delaware 
General Corporation Law (the "DGCL"), the Company shall be merged with and 
into Sub at the Effective Time (as defined in Section 1.03).  Following the 
Merger, the separate corporate existence of the Company shall cease and Sub 
shall continue as the surviving corporation (the "Surviving Corporation") and 
shall succeed to and assume all the rights and obligations of the Company in 
accordance with the DGCL.  At the election of Parent, any direct or indirect 
wholly owned subsidiary (as defined in Section 8.03) of Parent may be 
substituted for Sub as a constituent corporation in the Merger.  In such 
event, the parties hereto agree to execute an appropriate amendment to this 
Agreement in order to reflect such substitution.

          SECTION 1.02.  CLOSING.  The closing of the Merger (the "Closing") 
will take place at 10:00 a.m. on a date to be specified by the parties, which 
shall be no later than the second business day after satisfaction or waiver 
of the conditions set forth in Article VI (the "Closing Date"), at the 
offices of Cravath, Swaine & Moore, Worldwide Plaza, 825 Eighth Avenue, New 
York, N.Y. 10019, unless another date or place is agreed to in writing by the 
parties hereto.

          SECTION 1.03.  EFFECTIVE TIME.  Subject to the provisions of this 
Agreement, as soon as practicable on or after the Closing Date, the parties 
shall file a certificate of merger or other appropriate documents (in any 
such case, the "Certificate of Merger") executed in accordance with the 
relevant provisions of the DGCL and shall make all other filings or 
recordings required under the DGCL.  The Merger shall become effective at 
such time as the Certificate of Merger is duly filed with the Delaware 
Secretary of State, or at such other time as Parent and the Company shall 
agree should be specified in the Certificate of Merger (the time the Merger 
becomes effective being the "Effective Time").

          SECTION 1.04.  EFFECTS OF THE MERGER.  The Merger shall have the 
effects set forth in Section 259 of the DGCL.

          SECTION 1.05.  CERTIFICATE OF INCORPORATION AND BY-LAWS.  (a)  The 
Certificate of Incorporation of Sub, as in effect immediately prior to the 
Effective Time, shall be the Certificate of Incorporation of the Surviving 
Corporation until thereafter changed or amended as provided therein or by 
applicable law, subject in all cases to 
<PAGE>

                                                                            3

Section 5.07, except that the name of the Surviving Corporation in such 
Certificate of Incorporation will be changed to be "Unison Software, Inc.".

          (b)  The By-Laws of Sub, as in effect immediately prior to the 
Effective Time, shall be the By-Laws of the Surviving Corporation until 
thereafter changed or amended as provided therein or by applicable law 
(subject in all cases to Section 5.07).

          SECTION 1.06.  DIRECTORS.  The directors of Sub immediately prior 
to the Effective Time shall be the directors of the Surviving Corporation, 
until the earlier of their resignation or removal or until their respective 
successors are duly elected and qualified, as the case may be.

          SECTION 1.07.  OFFICERS.  The officers of the Company immediately 
prior to the Effective Time shall be the officers of the Surviving 
Corporation, until the earlier of their resignation or removal or until their 
respective successors are duly elected and qualified, as the case may be.

                                   ARTICLE II

                EFFECT OF THE MERGER ON THE CAPITAL STOCK OF THE
               CONSTITUENT CORPORATIONS; EXCHANGE OF CERTIFICATES

          SECTION 2.01.  EFFECT ON CAPITAL STOCK.  As of the Effective Time, 
by virtue of the Merger and without any action on the part of the holder of 
any shares of common stock, par value $.001 per share, of the Company 
("Company Common Stock") or any shares of capital stock of Sub:

          (a)  CAPITAL STOCK OF SUB.  Each issued and outstanding share of
     capital stock of Sub shall remain issued and outstanding from and after 
     the Effective Time.

          (b)  CANCELATION OF TREASURY STOCK AND PARENT-OWNED STOCK.  Each 
     share of Company Common Stock that is owned by the Company and each 
     share of Company Common Stock that is owned by Parent shall 
     automatically be canceled and retired and shall cease to exist, and no 
     shares of capital stock, par value $1.25 per share, of Parent ("Parent 
     Common Stock"), cash or other consideration shall be delivered in 
     exchange therefor.
<PAGE>

                                                                            4

          (c)  CONVERSION OF COMPANY COMMON STOCK. (i)  Except as otherwise
     provided in Section 2.01(d) and subject to Sections 2.01(b) and 
     2.01(c)(iii), each issued and outstanding share of Company Common 
     Stock, shall be converted into the right to receive, at the election of 
     the holder thereof, one of the following (as adjusted pursuant to 
     Section 2.01(d), the "Merger Consideration"):

               (A)  for each such share of Company Common Stock with respect to
          which an election to receive Parent Common Stock ("Stock 
          Consideration") has been effectively made, and not revoked or 
          lost, pursuant to Section 2.03 (a "Stock Election"), the right to 
          receive a number of shares of Parent Common Stock equal to a 
          fraction (the "Exchange Ratio"), the numerator of which is $15 
          and the denominator of which is the Parent Common Stock Price.  
          The "Parent Common Stock Price" means the average of the closing 
          sales prices of Parent Common Stock on the New York Stock 
          Exchange ("NYSE") Composite Transactions Tape on each of the ten 
          consecutive trading days immediately preceding the second trading 
          day prior to the date of the Effective Time; and

               (B)  for each such share of Company Common Stock with respect to
          which an election to receive cash consideration (the "Cash 
          Consideration") has been effectively made, and not revoked or 
          lost, or deemed to have been made, pursuant to Section 2.03 (a 
          "Cash Election"), the right to receive cash from Parent, in an 
          amount equal to $15.

          (ii)  As of the Effective Time all shares of Company Common Stock
     shall cease to be outstanding and shall be canceled and retired and 
     shall cease to exist, and each holder of a certificate that immediately 
     prior to the Effective Time represented any such shares of Company 
     Common Stock (a "Certificate") shall cease to have any rights with 
     respect thereto, except the right to receive the Merger Consideration 
     and cash in lieu of fractional shares of Parent Common Stock in 
     accordance with Section 2.02(e) upon the surrender of such Certificate 
     in accordance with Section 2.02, without interest.

          (iii)  Notwithstanding anything in this Agreement to the contrary,
     shares of Company Common Stock that are issued and outstanding 
     immediately prior to the
<PAGE>

                                                                           5

     Effective Time and that are held by a holder who is entitled to 
     demand, and who properly demands, appraisal for such shares in 
     accordance with Section 262 of the  DGCL ("Dissenting Shares") shall 
     not be converted into or be exchangeable for the right to receive the 
     Merger Consideration, unless such holder shall have failed to perfect 
     or shall have effectively withdrawn or lost his right to appraisal and 
     payment, as the case may be.  If, after the Effective Time, such holder 
     shall have so failed to perfect or shall have effectively withdrawn or 
     lost such right, such shares shall thereupon be deemed to have been 
     converted into and to have become exchangeable for, at the Effective 
     Time, the right to receive the consideration described in Section 
     2.03(f), without any interest thereon.  The Company shall give Parent 
     prompt notice of any Dissenting Shares (and shall also give Parent 
     prompt notice of any withdrawals of such demands for appraisal rights) 
     and Parent shall have the right to direct all negotiations and 
     proceedings with respect to any such demands.  Neither the Company nor 
     the Surviving Corporation shall, except with the prior written consent 
     of Parent, voluntarily make any payment with respect to, or settle or 
     offer to settle, any such demand for appraisal rights.

          (d) PRORATION.   

          (i)  The aggregate amount of cash to be paid to holders of Company
     Common Stock pursuant to this Article II (the "Cash Cap") shall not exceed
     the product of (x) $15 and (y) the number of shares of Company Common Stock
     outstanding immediately prior to the Effective Time minus the sum of (A)
     the number of shares of Company Common Stock that will be canceled pursuant
     to Section 2.01(b) and (B) the number of Dissenting Shares and (z) 0.5.

          (ii)  In the event that the aggregate amount of cash requested in Cash
     Elections received by (and deemed to have been received by) the Exchange
     Agent in accordance with Section 2.03 (the "Requested Cash Amount") exceeds
     the Cash Cap, each holder making a Cash Election (and each holder who is
     deemed to have made a Cash Election pursuant to Section 2.03) shall
     receive, with respect to each share of Company Common Stock for which a
     Cash Election has been made or deemed made, (x) cash in an amount equal to
     the product of (A) $15 and (B) the Cash Proration Factor (as defined below)
     (such product, the "Prorated Cash Amount") and (y) a number of shares of
     Parent Common Stock equal to a fraction, the numerator of which is equal to
     $15 
<PAGE>
                                                                              6

     minus the Prorated Cash Amount and the denominator of which is the
     Parent Common Stock Price.  The "Cash Proration Factor" shall be a
     fraction, the numerator of which is the Cash Cap and the denominator of
     which is the Requested Cash Amount.

          SECTION 2.02.  EXCHANGE OF CERTIFICATES.  (a)  EXCHANGE AGENT.  As 
of the Effective Time, Parent shall deposit with the Exchange Agent (as 
defined in Section 2.03(b)), for the benefit of the holders of shares of 
Company Common Stock, for exchange in accordance with this Article II, 
through the Exchange Agent, the cash and certificates representing the shares 
of Parent Common Stock constituting the Merger Consideration (such cash and 
shares of Parent Common Stock, together with any dividends or distributions 
with respect thereto with a record date after the Effective Time and any cash 
payments in lieu of any fractional shares of Parent Common Stock, being 
hereinafter referred to as the "Exchange Fund") issuable pursuant to Section 
2.01 in exchange for outstanding shares of Company Common Stock.

          (b)  EXCHANGE PROCEDURES.  Following the Effective Time, each 
holder of an outstanding Certificate or Certificates shall, upon surrender to 
the Exchange Agent of such Certificate or Certificates and acceptance thereof 
by the Exchange Agent, be entitled to a certificate or certificates 
representing the number of full shares of Parent Common Stock, if any, and 
the amount of cash, if any, into which the aggregate number of shares of 
Company Common Stock previously represented by such Certificate or 
Certificates surrendered shall have been converted pursuant to this 
Agreement.  The Exchange Agent shall accept such Certificates upon compliance 
with such reasonable terms and conditions as the Exchange Agent may impose to 
effect an orderly exchange thereof in accordance with normal exchange 
practices.  If any certificate for such Parent Common Stock is to be issued 
in, or if cash is to be remitted to, a name other than that in which the 
Certificate surrendered for exchange is registered, it shall be condition of 
such exchange that the Certificate so surrendered shall be properly endorsed, 
with signature guaranteed, or otherwise in proper form for transfer and that 
the person (as defined in Section 8.03) requesting such exchange shall pay to 
Parent or its transfer agent any transfer or other taxes (as defined in 
Section 3.01(m)) required by reason of the issuance of Certificates for such 
Parent Common Stock in a name other than that of the registered holder of the 
Certificate surrendered, or establish to the satisfaction of Parent or its 
transfer agent that such tax has been paid or is not applicable.  Until 
surrendered as contemplated by 

<PAGE>

                                                                              7

this Section 2.02(b), each Certificate shall be deemed at any time after the 
Effective Time to represent only the right to receive upon such surrender the 
Merger Consideration as contemplated by Section 2.01.  No interest will be 
paid or will accrue on any cash payable as Merger Consideration or in lieu of 
any fractional shares of Parent Common Stock.

          (c)  DISTRIBUTIONS WITH RESPECT TO UNEXCHANGED SHARES.  No 
dividends or other distributions with respect to Parent Common Stock with a 
record date after the Effective Time shall be paid to the holder of any 
unsurrendered Certificate with respect to the shares of Parent Common Stock 
represented thereby and no cash payment in lieu of fractional shares shall be 
paid to any such holder pursuant to Section 2.02(e) until the holder of 
record of such Certificate shall surrender such Certificate.  Following 
surrender of any such Certificate, there shall be paid to the record holder 
of the certificate representing whole shares of Parent Common Stock issued in 
exchange therefor, without interest, (i) at the time of such surrender, the 
amount of dividends or other distributions with a record date after the 
Effective Time theretofore paid with respect to such whole shares of Parent 
Common Stock, and (ii) at the appropriate payment date, the amount of 
dividends or other distributions with a record date after the Effective Time 
but prior to such surrender and a payment date subsequent to such surrender 
payable with respect to such whole shares of Parent Common Stock.

          (d)  NO FURTHER OWNERSHIP RIGHTS IN COMPANY COMMON STOCK.  The 
Merger Consideration issued upon the surrender for exchange of shares of 
Company Common Stock in accordance with the terms hereof (including any cash 
paid pursuant to Section 2.02(c) or 2.02(e)) shall be deemed to have been 
issued (and paid) in full satisfaction of all rights pertaining to such 
shares of Company Common Stock, SUBJECT, HOWEVER, to the Surviving 
Corporation's obligation to pay any dividends or make any other distributions 
with a record date prior to the Effective Time which may have been declared 
or made by the Company on such shares of Company Common Stock in accordance 
with the terms of this Agreement or prior to the date of this Agreement and 
which remain unpaid at the Effective Time, and there shall be no further 
registration of transfers on the stock transfer books of the Surviving 
Corporation of the shares of Company Common Stock that were outstanding 
immediately prior to the Effective Time.  If, after the Effective Time, 
Certificates are presented to the Surviving Corporation or the Exchange Agent 
for any reason, they shall be canceled and exchanged as provided in this 
Article II.

<PAGE>

                                                                             8

          (e)  NO FRACTIONAL SHARES. (i)  No certificates or scrip 
representing fractional shares of Parent Common Stock shall be issued upon 
the surrender for exchange of Certificates, and such fractional share 
interests will not entitle the owner thereof to vote or to any rights of a 
stockholder of Parent.

          (ii)  Notwithstanding any other provision of this Agreement, each 
holder of shares of Company Common Stock exchanged pursuant to the Merger who 
would otherwise have been entitled to receive a fraction of a share of Parent 
Common Stock (after taking into account all Certificates delivered by such 
holder) shall receive, in lieu thereof, cash (without interest) in an amount, 
less the amount of any withholding taxes which may be required thereon, equal 
to such fractional part of a share of Parent Common Stock multiplied by the 
Parent Common Stock Price.

          (f)  TERMINATION OF EXCHANGE FUND.  Any portion of the Exchange 
Fund that remains undistributed to the holders of the Certificates for six 
months after the Effective Time shall be delivered to Parent, upon demand, 
and any holders of the Certificates who have not theretofore complied with 
this Article II shall thereafter look only to Parent for, and Parent shall 
remain liable for, payment of their claim for Merger Consideration, any cash 
in lieu of fractional shares of Parent Common Stock and any dividends or 
distributions with respect to Parent Common Stock.

          (g)  NO LIABILITY.  None of Parent, Sub, the Company or the Exchange
Agent shall be liable to any person in respect of any shares of Parent 
Common Stock (or dividends or distributions with respect thereto) or 
cash from the Exchange Fund in each case delivered to a public official 
pursuant to any applicable abandoned property, escheat or similar law.

          (h)  INVESTMENT OF EXCHANGE FUND.  The Exchange Agent shall invest 
any cash included in the Exchange Fund, as directed by Parent, on a daily 
basis. Any interest and other income resulting from such investments shall be 
paid to Parent.

          (i)  LOST CERTIFICATES.  If any Certificate shall have been lost, 
stolen or destroyed, upon the making of an affidavit of that fact by the 
person claiming such Certificate to be lost, stolen or destroyed and, if 
required by the Surviving Corporation, the posting by such person of a bond 
in such reasonable amount as the Surviving Corporation may direct as 
indemnity against any claim that may be made against it with respect to such 
Certificate, the 

<PAGE>

                                                                             9

Exchange Agent will issue in exchange for such lost, stolen or destroyed 
Certificate the Merger Consideration and any cash in lieu of fractional 
shares, and unpaid dividends and distributions on shares of Parent Common 
Stock deliverable in respect thereof, pursuant to this Agreement.

          (j)  WITHHOLDING RIGHTS.  Parent, Sub or the Exchange Agent shall 
be entitled to deduct and withhold from the consideration otherwise payable 
pursuant to this Agreement to any holder of shares of Company Common Stock 
such amounts as Parent, Sub or the Exchange Agent is required to deduct and 
withhold with respect to the making of such payment under the Code, or any 
provision of state, local or foreign tax law.  To the extent that amounts are 
so withheld and paid over to the appropriate taxing authority by Parent, Sub 
or the Exchange Agent, such withheld amounts shall be treated for all 
purposes of this Agreement as having been paid to the holder of the shares of 
Company Common Stock in respect of which such deduction and withholding was 
made by Parent, Sub or the Exchange Agent.

          SECTION 2.03.  ELECTIONS.  (a)  Each person who, on or prior to the 
Election Date referred to in (c) below, is a record holder of shares of 
Company Common Stock shall be entitled, with respect to all or any portion of 
such shares, to make a Stock Election or a Cash Election on or prior to such 
Election Date, on the basis hereinafter set forth.

          (b)  Prior to the mailing of the Proxy Statement (as defined in 
Section 3.01(d)), Sub shall appoint a bank or trust company reasonably 
acceptable to the Company to act as exchange agent (the "Exchange Agent") for 
the payment of the Merger Consideration.

          (c)  Parent shall prepare and mail a form of election, which form 
shall be subject to the reasonable approval of the Company (the "Form of 
Election"), with the Proxy Statement to the record holders of Company Common 
Stock as of the record date for the Stockholders Meeting (as defined in 
Section 5.01(b)), which Form of Election shall be used by each record holder 
of shares of Company Common Stock who wishes to elect to receive the Stock 
Consideration or the Cash Consideration for any or all shares of Company 
Common Stock held by such holder.  The Company will use its best efforts to 
make the Form of Election and the Proxy Statement available to all persons 
who become record holders of Company Common Stock during the period between 
such record date and the Election Date referred to below.  Any such holder's 
election to receive the Stock Consideration shall have been properly made 
only if the Exchange Agent 

<PAGE>

                                                                            10

shall have received at its designated office, by 5:00 p.m., New York City 
time, on the business day next preceding the date of the Stockholders Meeting 
(the "Election Date"), a Form of Election properly completed and signed and 
accompanied by the Certificates for the shares of Company Common Stock to 
which such Form of Election relates, duly endorsed in blank or otherwise in 
form acceptable for transfer on the books of the Company (or by an 
appropriate guarantee of delivery of such Certificates as set forth in such 
Form of Election from a firm which is a member of a registered national 
securities exchange or of the National Association of Securities Dealers, 
Inc. or a commercial bank or trust company having an office or correspondent 
in the United States, provided such Certificates are in fact delivered to the 
Exchange Agent within three NYSE trading days after the date of execution of 
such guarantee of delivery).

          (d)  Any Form of Election may be revoked, by the stockholder who 
submitted such Form of Election to the Exchange Agent, only by written notice 
received by the Exchange Agent (i) prior to 5:00 p.m., New York City time on 
the Election Date or (ii) 60 days after the date the Proxy Statement is first 
mailed to holders of Company Common Stock, if the Effective Time shall not 
have occurred prior to such date.  In addition, all Forms of Election shall 
automatically be revoked if the Exchange Agent is notified in writing by 
Parent and the Company that the Merger has been abandoned.  If a Form of 
Election is revoked, the Certificate or Certificates (or guarantees of 
delivery, as appropriate) for the shares of Company Common Stock to which 
such Form of Election relates shall be promptly returned to the stockholder 
submitting the same to the Exchange Agent.

          (e)  The good faith determination of the Exchange Agent whether or 
not elections to receive the Stock Consideration have been properly made or 
revoked pursuant to this Section 2.03 with respect to shares of Company 
Common Stock and when elections and revocations were received by it shall be 
binding.  If no Form of Election is received with respect to shares of 
Company Common Stock, or if the Exchange Agent determines that any election 
to receive the Stock Consideration was not properly made with respect to 
shares of Company Common Stock, a Cash Election shall be deemed to have been 
made with respect to such shares and such shares shall be exchanged in the 
Merger for Cash Consideration pursuant to Section 2.01(c)(i)(B) (subject to 
Section 2.01(d)).  In addition, for purposes of calculating the Requested 
Cash Amount, each holder of shares of Company Common Stock who has delivered 
a demand for appraisal of such holder's shares shall be deemed to have made a 
Cash 

<PAGE>

                                                                            11

Election with respect to such shares.  The Exchange Agent shall also make all 
computations as to the proration contemplated by Section 2.01(d) (which 
computation shall be made as soon as practicable following the third NYSE 
trading day after the Election Date), and absent manifest error any such 
computation shall be conclusive and binding on the holders of shares of 
Company Common Stock.  The Exchange Agent may, with the mutual agreement of 
Parent and the Company, make such rules as are consistent with this Section 
2.03 for the implementation of the elections provided for herein as shall be 
necessary or desirable fully to effect such elections.

          (f) If, after the Effective Time, a holder of Dissenting Shares 
shall have failed to perfect or shall have effectively withdrawn or lost his 
right to appraisal and payment, such shares shall thereupon be deemed to have 
been converted into and to have become exchangeable for, at the Effective 
Time, the right to receive for each such share the amount in cash (and, if 
applicable, the number of shares of Parent Common Stock (subject to Section 
2.02(e))), without interest, that a holder of a share (a "Nondissenting 
Share") of Company Common Stock who had made or had been deemed to have made 
a Cash Election with respect to such Nondissenting Share pursuant to Section 
2.03 prior to the Election Date would have received with respect to such 
Nondissenting Share (it being understood that no adjustment shall be made to 
the proration computation (if any) made following the Election Date to give 
effect to the withdrawal of, or the failure to perfect, the demand for 
appraisal with respect to such Dissenting Shares).

                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES

          SECTION 3.01.  REPRESENTATIONS AND WARRANTIES OF THE COMPANY.  
Except as set forth on the disclosure schedule delivered by the Company to 
Parent prior to the execution of this Agreement (the "Company Disclosure 
Schedule"), the Company represents and warrants to Parent and Sub as follows:

          (a)  ORGANIZATION, STANDING AND CORPORATE POWER.  The Company and each
     of its subsidiaries is a corporation duly organized, validly existing and
     in good standing under the laws of the jurisdiction of its organization and
     has all requisite corporate power and authority to carry on its business as
     now being conducted.  The Company and each of its subsidiaries is 

<PAGE>

                                                                            12

     duly qualified or licensed to do business and is in good standing in each 
     jurisdiction in which the nature of its business or the ownership, 
     leasing or operation of its properties makes such qualification or 
     licensing necessary, other than in such jurisdictions where the failure 
     to be so qualified or licensed or be in good standing individually or in 
     the aggregate would not have a material adverse effect (as defined in 
     Section 8.03) on the Company.  The Company has delivered to Parent 
     complete and correct copies of its Certificate of Incorporation and 
     Bylaws and the certificates of incorporation and by-laws (or similar 
     organizational documents) of each of its subsidiaries, in each case as 
     amended to the date hereof.

          (b)  SUBSIDIARIES. The only subsidiaries of the Company are Unison 
     Software Texas, Inc., Unison Software U.K. Limited and Unison Software 
     International.  All the outstanding shares of capital stock of each such 
     subsidiary (other than director qualifying shares of foreign 
     subsidiaries) are owned by the Company, by another wholly owned 
     subsidiary of the Company or by the Company and another wholly owned 
     subsidiary of the Company, free and clear of all pledges, claims, liens, 
     charges, encumbrances and security interests of any kind or nature 
     whatsoever (collectively, "Liens"), and are duly authorized, validly 
     issued, fully paid and nonassessable.  Except for the capital stock of 
     its subsidiaries, the Company does not own, directly or indirectly, any 
     capital stock or other ownership interest in any corporation, 
     partnership, joint venture, association or other entity.

          (c)  CAPITAL STRUCTURE.  The authorized capital stock of the 
     Company consists of 40,000,000 shares of Company Common Stock and 
     5,000,000 shares of preferred stock, par value $.001 per share.  At the 
     close of business on September 11, 1997, (i)  11,968,588 shares of 
     Company Common Stock were issued and outstanding, (ii)  no shares of 
     Company Common Stock were held by the Company in its treasury and (iii) 
     1,967,824 shares of Company Common Stock were reserved for issuance 
     pursuant to outstanding Company Stock Plans (as defined in Section 5.06) 
     (including 71,829 shares reserved pursuant to the ESPP (as defined in 
     Section 3.01(l)).  Except as set forth above, at the close of business 
     on September 11, 1997, no shares of capital stock or other voting 
     securities of the Company were issued, reserved for issuance or 
     outstanding.  There are no outstanding stock appreciation rights or 
     rights (other than Stock 
<PAGE>

                                                                            13

     Options (as defined in Section 5.06)) to receive shares of Company Common 
     Stock on a deferred basis granted under the Company Stock Plans or 
     otherwise.  All outstanding shares of capital stock of the Company are, 
     and all shares which may be issued pursuant to the Company Stock Plans 
     will be, when issued in accordance with the terms thereof, duly 
     authorized, validly issued, fully paid and nonassessable and not subject 
     to preemptive rights.  There are no bonds, debentures, notes or other 
     indebtedness of the Company having the right to vote (or convertible 
     into, or exchangeable for, securities having the right to vote) on any 
     matters on which stockholders of the Company may vote.  Except as set 
     forth above, and except for Stock Options that may be granted as 
     permitted under clause (z) of Section 4.01(a)(ii), there are no 
     securities, options, warrants, calls, rights, contracts, commitments, 
     agreements, arrangements, obligations or undertakings of any kind to 
     which the Company or any of its subsidiaries is a party, or by which the 
     Company or any of its subsidiaries is bound, obligating the Company or 
     any of its subsidiaries to issue, deliver or sell, or cause to be 
     issued, delivered or sold, additional shares of capital stock or other 
     voting securities of the Company or any of its subsidiaries or 
     obligating the Company or any of its subsidiaries to issue, grant, 
     extend or enter into any such security, option, warrant, call, right, 
     contract, commitment, agreement, arrangement, obligation or undertaking. 
     There are not any outstanding contractual obligations (i) of the 
     Company or any of its subsidiaries to repurchase, redeem or otherwise 
     acquire any shares of capital stock of the Company or (ii) of the 
     Company to vote or to dispose of any shares of the capital stock of any 
     of its subsidiaries. 

          (d)  AUTHORITY; NONCONTRAVENTION.  The Company has the requisite 
     corporate power and authority to execute and deliver this Agreement and, 
     subject to receipt of the Stockholder Approval (as defined in Section 
     3.01(q)), to consummate the transactions contemplated by this Agreement. 
     The execution, delivery and performance of this Agreement by the 
     Company and the consummation by the Company of the transactions 
     contemplated by this Agreement have been duly authorized by all 
     necessary corporate action on the part of the Company and no other 
     corporate proceedings on the part of the Company are necessary to 
     authorize this Agreement or to consummate the transactions contemplated 
     hereby, subject, in each case, to receipt of the Stockholder Approval.  
     This 
<PAGE>

                                                                            14

     Agreement has been duly executed and delivered by the Company and      
     constitutes a valid and binding obligation of the Company, enforceable 
     against the Company in accordance with its terms.  The execution and 
     delivery of this Agreement do not, and the consummation of the 
     transactions contemplated by this Agreement and compliance with the 
     provisions of this Agreement will not, conflict with, or result in any 
     violation of, or default (with or without notice or lapse of time, or 
     both) under, or give rise to a right of termination, cancelation or 
     acceleration of any obligation or to loss of a material benefit under, 
     or result in the creation of any Lien in or upon any of the properties 
     or assets of the Company under, any provision of (i) the Certificate of 
     Incorporation or Bylaws of the Company or the certificates of 
     incorporation or by-laws (or similar organizational documents) of any of 
     its subsidiaries, (ii) any loan or credit agreement, bond, debenture, 
     note, mortgage, indenture, lease or other material contract, commitment, 
     agreement, arrangement, obligation, undertaking, instrument, permit, 
     concession, franchise or license applicable to the Company or any of its 
     subsidiaries or their respective properties or assets or (iii) subject 
     to the governmental filings and other matters referred to in the 
     following sentence, any (A) statute, law, ordinance, rule or regulation 
     or (B) judgment, order or decree, in each case, applicable to the 
     Company or any of its subsidiaries or their respective properties or 
     assets, other than, in the case of clauses (ii) and (iii), any such 
     conflicts, violations, defaults, rights or Liens that individually or in 
     the aggregate would not (x) have a material adverse effect on the 
     Company, (y) impair in any material respect the ability of the Company 
     to perform its obligations under this Agreement or (z) prevent or 
     materially delay the consummation of any of the transactions 
     contemplated by this Agreement.  No consent, approval, order or 
     authorization of, or registration, declaration or filing with, any 
     Federal, state or local, domestic or foreign, government or any court, 
     administrative agency or commission or other governmental authority or 
     agency, domestic or foreign (a "Governmental Entity"), is required by or 
     with respect to the Company or any of its subsidiaries in connection 
     with the execution and delivery of this Agreement by the Company or the 
     consummation by the Company of the Merger or the other transactions 
     contemplated by this Agreement, except for (1) the filing of a premerger 
     notification and report form by the Company under the Hart-Scott-Rodino 
     Antitrust Improvements Act of 1976, as amended (the "HSR Act"), (2) the 
     filing 
<PAGE>

                                                                            15

     with the Securities and Exchange Commission (the "SEC") of a proxy 
     statement relating to the approval by the Company's stockholders of this 
     Agreement (as amended or supplemented from time to time, the "Proxy 
     Statement") and such reports under the Securities Exchange Act of 1934, 
     as amended (the "Exchange Act"), as may be required in connection with 
     this Agreement and the transactions contemplated by this Agreement, (3) 
     the filing of the Certificate of Merger with the Delaware Secretary of 
     State and appropriate documents with the relevant authorities of other 
     states in which the Company is qualified to do business and (4) such 
     other consents, approvals, orders, authorizations, registrations, 
     declarations and filings the failure of which to be obtained or made 
     individually or in the aggregate would not have a material adverse 
     effect on the Company, impair in any material respect the ability of the 
     Company to perform its obligations under this Agreement or prevent or 
     materially delay the consummation of any of the transactions 
     contemplated by this Agreement.

          (e)  SEC DOCUMENTS.  The Company has filed with the SEC, and has 
     heretofore made available to Parent true and complete copies of, all 
     reports, schedules, forms, statements and other documents required to be 
     filed with the SEC by the Company since July 1, 1995 (the "SEC 
     Documents"). As of their respective dates, the SEC Documents complied in 
     all material respects with the requirements of the Securities Act of 
     1933, as amended (the "Securities Act") or the Exchange Act, as the case 
     may be, and the rules and regulations of the SEC promulgated thereunder 
     applicable to such SEC Documents, and none of the SEC Documents at the 
     time they were filed contained any untrue statement of a material fact 
     or omitted to state a material fact required to be stated therein or 
     necessary in order to make the statements therein, in light of the 
     circumstances under which they were made, not misleading.  Except to the 
     extent that information contained in any SEC Document has been revised 
     or superseded by a later-filed SEC Document, none of the SEC Documents 
     at the time they were filed contained any untrue statement of a material 
     fact or omitted to state any material fact required to be stated therein 
     or necessary in order to make the statements therein, in light of the 
     circumstances under which they were made, not misleading.  The financial 
     statements of the Company included in the SEC Documents complied as to 
     form in all material respects with applicable accounting requirements 
     and the published rules and 
<PAGE>

                                                                            16

     regulations of the SEC with respect thereto, have been prepared in 
     accordance with generally accepted accounting principles ("GAAP") 
     (except, in the case of unaudited statements, as permitted by Form 10-Q 
     of the SEC) applied on a consistent basis during the periods involved 
     (except as may be indicated in the notes thereto) and fairly presented 
     the consolidated financial position of the Company and its consolidated 
     subsidiaries as of the dates thereof and the consolidated results of 
     their operations and cash flows for the periods then ended (subject, in 
     the case of unaudited statements, to normal year-end audit adjustments 
     and the absence of footnotes).  Except as set forth in the Filed SEC 
     Documents (as defined in Section 3.01(g)), the Company and its 
     subsidiaries have no liabilities or obligations of any nature (whether 
     accrued, absolute, contingent or otherwise) that individually or in the 
     aggregate would have a material adverse effect on the Company.

          (f)  INFORMATION SUPPLIED.  None of the information supplied or to 
     be supplied by the Company specifically for inclusion or incorporation 
     by reference in (i) the registration statement on Form S-4 to be filed 
     with the SEC by Parent in connection with the issuance of Parent Common 
     Stock in the Merger (the "Form S-4") will (except to the extent revised 
     or superseded by amendments or supplements contemplated hereby), at the 
     time the Form S-4 is filed with the SEC, at any time it is amended or 
     supplemented or at the time it becomes effective under the Securities 
     Act, contain 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, in light of the circumstances under which they are 
     made, not misleading or (ii) the Proxy Statement will (except to the 
     extent revised or superseded by amendments or supplements contemplated 
     hereby), at the date it is first mailed to the Company's stockholders or 
     at the time of the Stockholders Meeting, contain any untrue statement of 
     a material fact or omit to state any material fact required to be stated 
     therein or necessary in order to make the statements therein, in light 
     of the circumstances under which they are made, not misleading.  The 
     Proxy Statement will comply as to form in all material respects with the 
     requirements of the Exchange Act and the rules and regulations 
     thereunder, except that no representation is made by the Company with 
     respect to statements made or incorporated by reference therein based on 
     information 
<PAGE>

                                                                            17

     supplied by Parent or Sub specifically for inclusion or incorporation by 
     reference in the Proxy Statement.

          (g)  ABSENCE OF CERTAIN CHANGES OR EVENTS.  Except as disclosed in 
     the SEC Documents filed by the Company and publicly available prior to 
     the date of this Agreement (the "Filed SEC Documents"), since the date 
     of the most recent financial statements included in the Filed SEC 
     Documents, the Company and its subsidiaries have conducted their 
     respective businesses only in the ordinary course consistent with past 
     practice, and there has not been (i) any material adverse change (as 
     defined in Section 8.03) with respect to the Company, (ii) any 
     declaration, setting aside or payment of any dividend on, or other 
     distribution (whether in cash, stock or property) in respect of, any of 
     the Company's or any of its subsidiaries' capital stock except for 
     dividends by a wholly owned subsidiary of the Company to its parent, or 
     any  purchase, redemption or other acquisition of any of the Company's 
     capital stock or any other securities of the Company or its subsidiaries 
     or any options, warrants, calls or rights to acquire any such shares or 
     other securities except for repurchases from employees following their 
     termination pursuant to the terms of their existing stock option or 
     purchase agreements, (iii) any split, combination or reclassification of 
     any of the Company's or any of its subsidiaries' capital stock or any 
     issuance or the authorization of any issuance of any other securities in 
     respect of, in lieu of or in substitution for shares of the Company's or 
     any of its subsidiaries' capital stock, (iv) (x) any granting by the 
     Company or any of its subsidiaries of any increase in compensation or 
     fringe benefits, except for normal increases of cash compensation in the 
     ordinary course of business consistent with past practice, or any 
     payment by the Company or any of its subsidiaries of any bonus, except 
     for bonuses made in the ordinary course of business consistent with past 
     practice, in each case to any officer, director or employee, (y) any 
     granting by the Company or any of its subsidiaries to any officer or 
     employee of any increase in severance or termination pay or (z) any 
     entry by the Company or any of its subsidiaries into (A) any currently 
     effective employment, severance, termination or indemnification 
     agreement, or consulting agreement (other than in the ordinary course of 
     business consistent with past practice), with any current or former 
     officer, director, employee or consultant or (B) any agreement with any 
     current or former officer, director, employee or consultant the benefits 
     of which are contingent, or 
<PAGE>

                                                                            18


     the terms of which are materially altered, upon the occurrence of a 
     transaction involving the Company of the nature contemplated by this 
     Agreement, (v) any damage, destruction or loss, whether or not covered 
     by insurance, that individually or in the aggregate would have a 
     material adverse effect on the Company, (vi) any change in accounting 
     methods, principles or practices by the Company, except insofar as may 
     have been required by a change in GAAP, (vii) any tax election that 
     individually or in the aggregate would have a material adverse effect on 
     the Company or any of its tax attributes or any settlement or compromise 
     of any material income tax liability, (viii) any revaluation by the 
     Company of any of its material assets or (ix)(A) any licensing or other 
     agreement with regard to the acquisition or disposition of any material 
     Intellectual Property (as defined in Section 3.01(p)) or rights thereto 
     other than licenses in the ordinary course of business consistent with 
     past practice or (B) any amendment or consent with respect to any 
     licensing agreement filed, or required to be filed, by the Company with 
     the SEC.

          (h)  LITIGATION.  There is no suit, claim, action, investigation or 
     proceeding pending or, to the knowledge of the Company, threatened 
     against or affecting the Company or any of its subsidiaries that 
     individually or in the aggregate would have a material adverse effect on 
     the Company, nor is there any judgment, order, decree, injunction, 
     statute, law, ordinance, rule or regulation of any Governmental Entity 
     or arbitrator outstanding against, or, to the knowledge of the Company, 
     investigation by any Governmental Entity involving, the Company or any 
     of its subsidiaries that individually or in the aggregate would have a 
     material adverse effect on the Company.

          (i)  CONTRACTS.  Except as disclosed in the Filed SEC Documents as 
     of the date hereof, there are no contracts or agreements that are of a 
     nature required to be filed as an exhibit to any Filed SEC Document 
     under the Exchange Act and the rules and regulations promulgated 
     thereunder.  Neither the Company nor any of its subsidiaries is in 
     violation of or in default (with or without notice or lapse of time, or 
     both) under any lease, permit, concession, franchise, license or any 
     other contract, commitment, agreement, arrangement, obligation or 
     understanding to which it is a party or by which it or any of its 
     properties or assets is bound, except for violations or defaults that 
     individually or in the aggregate would not have a 
<PAGE>

                                                                            19

     material adverse effect on the Company. Neither the Company nor any of 
     its subsidiaries has entered into any contract, commitment, agreement, 
     arrangement or understanding with any affiliate (as defined in Section 
     8.03) of the Company that is currently in effect other than agreements 
     that are (i) disclosed in the Filed SEC Documents or (ii) not of a 
     nature required to be disclosed in the SEC Documents.  Neither the 
     Company nor any of its subsidiaries is a party to or otherwise bound by 
     any agreement or covenant not to compete or by any agreement or covenant 
     restricting in any material respect the development, marketing or 
     distribution of the Company's products or services. 

          (j)  COMPLIANCE WITH LAWS.  The Company and its subsidiaries are in
     compliance with all statutes, laws, ordinances, rules, regulations,
     judgments, orders and decrees of any Governmental Entity applicable to
     their businesses or operations, except for instances of possible
     noncompliance that individually or in the aggregate would not have a
     material adverse effect on the Company, impair in any material respect the
     ability of the Company to perform its obligations under this Agreement or
     prevent or materially delay the consummation of any of the transactions
     contemplated by this Agreement.  The Company and its subsidiaries have in
     effect all Federal, state and local, domestic and foreign, governmental
     consents, approvals, orders, authorizations, certificates, filings,
     notices, permits, franchises, licenses and rights (collectively "Permits")
     necessary for them to own, lease or operate their properties and assets and
     to carry on their businesses as now conducted and there has occurred no
     violation of, or default under, any such Permit, except for the lack of
     Permits and for violations of, or defaults under, Permits which lack,
     violation or default individually or in the aggregate would not have a
     material adverse effect on the Company.  The Merger, in and of itself,
     would not cause the revocation or cancelation of any such Permit, which
     revocation or cancelation would have a material adverse effect on the
     Company. 

          (k)  ABSENCE OF CHANGES IN BENEFIT PLANS; EMPLOYMENT AGREEMENTS; 
     LABOR RELATIONS.  Except as disclosed in the Filed SEC Documents, since 
     the date of the most recent financial statements included in the Filed 
     SEC Documents and until the date hereof, there has not been any 
     termination, adoption, amendment or agreement to amend in any material 
     respect by the Company or any of its subsidiaries of any collective 
<PAGE>

                                                                            20

     bargaining agreement or any bonus, pension, profit sharing, deferred 
     compensation, incentive compensation, stock ownership, stock purchase, 
     stock appreciation, restricted stock, stock option, phantom stock, 
     performance, retirement, vacation, severance, disability, death benefit, 
     hospitalization, medical or other material plan, arrangement or 
     understanding providing benefits to any current or former officer, 
     director or employee of the Company or any of its subsidiaries 
     (collectively, "Benefit Plans"), except that the Amended and Restated 
     1993 Director Stock Option Plan (the "Director Plan") may be amended to 
     permit the Stock Options outstanding thereunder to be assumed by Parent 
     in connection with the Merger.  Except as disclosed in the Filed SEC 
     Documents, as of the date hereof there exist no currently binding (i) 
     employment, severance, termination or indemnification agreements or 
     material consulting agreements between the Company or any of its 
     subsidiaries and any current or former officer, director, employee or 
     consultant of the Company or any of its subsidiaries or (ii) agreements 
     between the Company or any of its subsidiaries and any current or former 
     officer, director, employee or consultant of the Company or any of its 
     subsidiaries the benefits of which are contingent, or the terms of which 
     are materially altered, upon the occurrence of a transaction involving 
     the Company of the nature contemplated by this Agreement.  There are no 
     collective bargaining or other labor union agreements to which the 
     Company or any of its subsidiaries is a party or by which it is bound.  
     Since July 1, 1995, neither the Company nor any of its subsidiaries has 
     encountered any labor union organizing activity, nor had any actual or 
     threatened employee strikes, work stoppages, slowdowns or lockouts.

          (l)  ERISA COMPLIANCE.  (i)  Section 3.01(l)(i) of the Company 
     Disclosure Schedule contains a list of all "employee pension benefit 
     plans" (as defined in Section 3(2) of the Employee Retirement Income 
     Security Act of 1974, as amended ("ERISA")) (sometimes referred to 
     herein as "Pension Plans"), "employee welfare benefit plans" (as defined 
     in Section 3(1) of ERISA) and all other Benefit Plans maintained or 
     contributed to by the Company or any of its subsidiaries or any person 
     or entity that, together with the Company or any of its subsidiaries, is 
     treated as a single employer under Section 414(b), (c), (m) or (o) of 
     the Code (a "Commonly Controlled Entity") for the benefit of any current 
     or former officers, directors or employees of the Company or any of its 
     subsidiaries.  The Company 

<PAGE>

                                                                            21

     has made available to Parent true, complete and correct copies of (1) 
     each Benefit Plan (or, in the case of any unwritten Benefit Plans, 
     descriptions thereof), (2) the most recent annual report on Form 5500 
     required to be filed with the Internal Revenue Service (the "IRS") with 
     respect to each Benefit Plan (if any such report was required), (3) the 
     most recent summary plan description for each Benefit Plan for which 
     such summary plan description is required and (4) each trust agreement 
     and group annuity contract relating to any Benefit Plan.  Each Benefit 
     Plan has been administered in accordance with its terms, except where 
     the failure to so administer would not, individually or in the 
     aggregate, have a material adverse effect on the Company.  The Company 
     and its subsidiaries and all the Benefit Plans are all in compliance 
     with applicable provisions of ERISA and the Code, except for instances 
     of possible noncompliance that would not, individually or in the 
     aggregate, have a material adverse effect on the Company.

          (ii)  All Pension Plans have been the subject of determination      
     letters from the IRS to the effect that such Pension Plans are qualified 
     and exempt from United States Federal income taxes under Sections 401(a) 
     and 501(a), respectively, of the Code, and no such determination letter 
     has been revoked nor has any event occurred since the date of its most 
     recent determination letter or application therefor that would adversely 
     affect its qualification or materially increase its costs.

          (iii)  Neither the Company nor any Commonly Controlled Entity has 
     maintained, contributed to or been obligated to contribute to any 
     Benefit Plan that is subject to Title IV of ERISA.

          (iv)  With respect to any Benefit Plan that is an employee welfare 
     benefit plan, there are no understandings, agreements or undertakings, 
     written or oral, that would prevent any such plan (including any such 
     plan covering retirees or other former employees) from being amended or 
     terminated without material liability to the Company or any of its 
     subsidiaries on or at any time after the Effective Time.

          (v)  Section 3.01(l)(v) of the Company Disclosure Schedule lists 
     all Stock Options (excluding under the 1995 Employee Stock Purchase Plan 
     (the "ESPP")) outstanding as of the date hereof, indicating for each 
     such option (1) the number of shares issuable, (2) the 

<PAGE>

                                                                            22

     number of vested shares, (3) the date of expiration and (4) the exercise 
     price and separately sets forth the same information for all Stock 
     Options outstanding under the Director Plan.

          (vi)  No officer or employee of the Company or any of its 
     subsidiaries will be entitled to any additional compensation or benefits 
     or any acceleration of the time of payment or vesting of any 
     compensation or benefits under any Benefit Plan as a result of the 
     transactions contemplated by this Agreement or any benefits under any 
     Benefits Plan the value of which will be calculated on the basis of any 
     of the transactions contemplated by this Agreement.

          (vii)  The deduction of any amount payable pursuant to the terms of 
     the Benefit Plans or any other employment contracts or arrangements will 
     not be subject to disallowance under Section 162(m) of the Code.

          (m)  TAXES.  (i)  The Company and each of its subsidiaries has 
     timely filed all Federal, state and local, domestic and foreign, income 
     and franchise tax returns and reports and all other material tax returns 
     and reports required to be filed by each such entity.  All such returns 
     and reports are complete and correct in all material respects.  The 
     Company and each of its subsidiaries has timely paid all taxes due with 
     respect to the taxable periods covered by such returns and reports and 
     all other material taxes, and the most recent financial statements 
     contained in the Filed SEC Documents reflect an adequate reserve for all 
     taxes payable by the Company and its subsidiaries for all taxable 
     periods and portions thereof through the date of such financial 
     statements.

          (ii)  No Federal, state or local, domestic or foreign, income or 
     franchise tax return or report or any other material tax return or 
     report of the Company or any of its subsidiaries is under audit or 
     examination by any taxing authority, and no written or unwritten notice 
     of such an audit or examination has been received by the Company or any 
     of its subsidiaries. Each material deficiency resulting from any audit 
     or examination relating to taxes by any taxing authority has been timely 
     paid.  No material issues relating to taxes were raised by the relevant 
     taxing authority during any presently pending audit or examination, and 
     no material issues relating to taxes were raised by the relevant taxing 
     authority in any 
<PAGE>

                                                                            23

     completed audit or examination that can reasonably be expected to recur 
     in a later taxable period.  No Federal, state or local, domestic or 
     foreign, tax return or report of the Company or any of its subsidiaries 
     has ever been under audit or examination by the IRS or other relevant 
     taxing authority.  The relevant statute of limitations is closed with 
     respect to the United States Federal tax returns of the Company and its 
     subsidiaries for all years through 1991.

          (iii)  There is no currently effective agreement or other document 
     extending, or having the effect of extending, the period of assessment 
     or collection of any taxes and no power of attorney with respect to any 
     taxes has been executed or filed with any taxing authority.  

          (iv)  No material Liens for taxes exist with respect to any assets 
     or properties of the Company or any of its subsidiaries, except for 
     statutory Liens for taxes not yet due.  

          (v)  None of the Company or any of its subsidiaries is a party to 
     or bound by any tax sharing agreement, tax indemnity obligation or 
     similar agreement, arrangement or practice with respect to taxes 
     (including any advance pricing agreement, closing agreement or other 
     agreement relating to taxes with any taxing authority).  

          (vi)  None of the Company or any of its subsidiaries will be 
     required to include in a taxable period ending after the Effective Time 
     taxable income attributable to income that accrued in a prior taxable 
     period but was not recognized in any prior taxable period as a result of 
     the installment method of accounting, the completed contract method of 
     accounting, the long-term contract method of accounting, the cash method 
     of accounting or Section 481 of the Code or comparable provisions of 
     state or local tax law, domestic or foreign, or for any other reason.  

          (vii)  No amount or other entitlement that could be received 
     (whether in cash or property or the vesting of property) as a result of 
     any of the transactions contemplated by this Agreement by any officer, 
     director or employee of the Company or any of its affiliates who is a 
     "disqualified individual" (as such term is defined in proposed Treasury 
     Regulation Section 1.280G-1) under any Benefit Plan or other 
     compensation arrangement
<PAGE>

                                                                            24

     currently in effect would be characterized as an "excess parachute 
     payment" (as such terms are defined in Section 280G(b)(1) of the Code).

          (viii)  The Company and its subsidiaries have complied in all 
     material respects with all applicable statutes, laws, ordinances, rules 
     and regulations relating to the payment and withholding of taxes 
     (including withholding of taxes pursuant to Sections 1441, 1442, 3121 
     and 3402 of the Code or similar provisions under any foreign Federal 
     laws or any state or local laws, domestic and foreign)  and have, within 
     the time and the manner prescribed by law, withheld from and paid over 
     to the proper governmental authorities all amounts required to be so 
     withheld and paid over under applicable laws.

          (ix)  As used in this Agreement, "taxes" shall include all Federal, 
     state and local, domestic and foreign, income, franchise, property, 
     sales, excise, employment, payroll, social security, value-added, ad 
     valorem, transfer,  withholding and other taxes, including taxes based 
     on or measured by gross receipts, profits, sales, use or occupation, 
     tariffs, levies, impositions, assessments or governmental charges of any 
     nature whatsoever, including any interest penalties or additions with 
     respect thereto.

          (o)  TITLE TO PROPERTIES.  (i) The Company and each of its 
     subsidiaries has good and marketable title to, or valid leasehold 
     interests in, all of its material properties and assets except for such 
     as are no longer used or useful in the conduct of its businesses or as 
     have been disposed of in the ordinary course of business and except for 
     defects in title, easements, restrictive covenants and similar 
     encumbrances that individually or in the aggregate would not have a 
     material adverse effect on the Company.  All such material assets and 
     properties, other than assets and properties in which the Company or any 
     of its subsidiaries has a leasehold interest, are free and clear of all 
     Liens, except for Liens that individually or in the aggregate would not 
     have a material adverse effect on the Company.

          (ii)  Each of the Company and its subsidiaries has complied in all 
     material respects with the terms of all material leases to which it is a 
     party and under which it is in occupancy, and all such leases are in 
     full force and effect, except for such noncompliance or failure to be in 
     full force and effect as individually 
<PAGE>

                                                                            25

     or in the aggregate would not have a material adverse effect on the 
     Company.  The Company and its subsidiaries enjoy peaceful and 
     undisturbed possession under all such material leases, except for 
     failures to do so that individually or in the aggregate would not have a 
     material adverse effect on the Company.

          (p)  INTELLECTUAL PROPERTY.  (i) The Company has made available to 
     Parent true and correct copies of all license agreements relating to 
     Intellectual Property to which the Company or any of its subsidiaries is 
     a party.

          (ii) Except to the extent that any of the following (or the 
     circumstances giving rise to such inaccuracy) would not have a material 
     adverse effect on the Company:

          (A) the Company and each of its subsidiaries owns, or is licensed 
     or otherwise has the right to use (in each case, free and clear of any 
     Liens), all Intellectual Property used in or necessary for the conduct 
     of its business as currently conducted;

          (B) there is no suit, claim, action, investigation or proceeding 
     pending or, to the knowledge of the Company, threatened that the Company 
     or any of its subsidiaries is infringing on or otherwise violating the 
     rights of any person with regard to any Intellectual Property owned by, 
     licensed to and/or otherwise used by the Company or its subsidiaries;

          (C) to the knowledge of the Company, no person is infringing on or 
     otherwise violating any right of the Company or any of its subsidiaries 
     with respect to any Intellectual Property owned by, licensed to and/or 
     otherwise used by the Company or its subsidiaries;

          (D) to the knowledge of the Company, none of the former or current 
     members of management or key personnel of the Company or any of its 
     subsidiaries, including all former and current employees, agents, 
     consultants and contractors who have contributed to or participated in 
     the conception and development of computer software or other 
     Intellectual Property of the Company or any of its subsidiaries, have 
     any valid claim against the Company or any of its subsidiaries in 
     connection with the involvement of such persons in the conception and 
     development of any computer software or other Intellectual Property of 
     the Company or any of
<PAGE>

                                                                           26

     its subsidiaries, and no such claim has been asserted or threatened;

          (E) the execution and delivery of this Agreement do not, and the 
     consummation of the transactions contemplated by this Agreement and 
     compliance with the provisions of this Agreement will not, conflict 
     with, or result in any violation of, or default (with or without notice 
     or lapse of time, or both) under, or give rise to any right, license or 
     encumbrance relating to, Intellectual Property owned by the Company or 
     with respect to which the Company now has or has had any agreement with 
     any third party, or any right of termination, cancelation or 
     acceleration of any material Intellectual Property right or obligation 
     set forth in any agreement to which the Company is a party, or the loss 
     or encumbrance of any Intellectual Property or material benefit related 
     thereto, or result in the creation of any Lien in or upon any 
     Intellectual Property or right, other than under certain contracts and 
     agreements, the material ones of which are set forth on Section 3.01(p) 
     of the Company Disclosure Schedule, that (1) provide for their 
     termination upon a change of control of the Company or (2) contain 
     provisions restricting their assignment; 

          (F) except in the ordinary course of business consistent with past 
     practice, no licenses or rights have been granted to distribute the 
     source code of, or to use the source code to create Derivative Works (as 
     hereinafter defined) of, any product currently marketed by, commercially 
     available from or under development by the Company or any of its 
     subsidiaries for which the Company possesses the source code; and 

          (G) the Company and each of its subsidiaries has taken reasonable 
     and necessary steps to protect their Intellectual Property and their 
     rights thereunder, and to the knowledge of the Company no such rights to 
     Intellectual Property have been lost or are in jeopardy of being lost 
     through failure to act by the Company or any of its subsidiaries.

          As used herein, "Derivative Work" shall mean a work that is based 
     upon one or more preexisting works, such as a revision, enhancement, 
     modification, abridgement, condensation, expansion or any other form in 
     which such preexisting works may be recast, transformed or adapted, and 
     which, if prepared without authorization of the owner of the copyright 
     in such preexisting work, would constitute a copyright 
<PAGE>

                                                                           27

     infringement.  For purposes hereof, a Derivative Work shall also include 
     any compilation that incorporates such a preexisting work as well as 
     translation from one human language to another and from one type of code 
     to another.

          (iii) For purposes of this Agreement, "Intellectual Property" shall 
     mean trademarks (registered or unregistered), service marks, brand 
     names, certification marks, trade dress, assumed names, trade names and 
     other indications of origin, the goodwill associated with the foregoing 
     and registrations in any jurisdiction of, and applications in any 
     jurisdiction to register, the foregoing, including any extension, 
     modification or renewal of any such registration or application; 
     inventions, discoveries and ideas, whether patented, patentable or not 
     in any jurisdiction; trade secrets and confidential information and 
     rights in any jurisdiction to limit the use or disclosure thereof by any 
     person; writings and other works, whether copyrighted, copyrightable or 
     not in any jurisdiction; registration or applications for registration 
     of copyrights in any jurisdiction, and any renewals or extensions 
     thereof; any similar intellectual property or proprietary rights and 
     computer programs and software (including source code, object code and 
     data); licenses, immunities, covenants not to sue and the like relating 
     to the foregoing; and any claims or causes of action arising out of or 
     related to any infringement or misappropriation of any of the foregoing.

          (q)  VOTING REQUIREMENTS.  The affirmative vote of the holders of a 
     majority of the outstanding shares of Company Common Stock at the 
     Stockholders Meeting or any adjournment or postponement thereof to 
     approve and adopt this Agreement (the "Stockholder Approval") is the 
     only vote of the holders of any class or series of the Company's capital 
     stock necessary to approve and adopt this Agreement and approve the 
     transactions contemplated hereby.

          (r)  STATE TAKEOVER STATUTES.  The Board of Directors of the 
     Company has approved the Merger, this Agreement, the Stockholder 
     Agreement, the acquisition by Parent in open market purchases of such 
     number of additional shares of Company Common Stock as shall constitute, 
     when taken together with the shares of Company Common Stock subject to 
     the Stockholder Agreement, 40% of the fully diluted number of shares of 
     Company Common Stock (the "Open Market Purchases") and 

<PAGE>

                                                                           28

     the other transactions contemplated by this Agreement and the 
     Stockholder Agreement, and such approval is sufficient to render 
     inapplicable to the Merger, this Agreement, the Stockholder Agreement, 
     the Open Market Purchases and the other transactions contemplated by 
     this Agreement and the Stockholder Agreement, the provisions of Section 
     203 of the DGCL to the extent, if any, such Section would otherwise be 
     applicable to the Merger, this Agreement, the Stockholder Agreement, the 
     Open Market Purchases and the other transactions contemplated by this 
     Agreement and the Stockholder Agreement.

          (s)  BROKERS; SCHEDULE OF FEES AND EXPENSES.  No broker, investment 
     banker, financial advisor or other person, other than Goldman, Sachs & 
     Co., the fees and expenses of which will be paid by the Company, is 
     entitled to any broker's, finder's, financial advisor's or other similar 
     fee or commission in connection with the transactions contemplated by 
     this Agreement or the Stockholder Agreement based upon arrangements made 
     by or on behalf of the Company. The Company has delivered to Parent true 
     and complete copies of all agreements under which any such fees or 
     expenses are payable and all indemnification and other agreements 
     related to the engagement of the persons to whom such fees are payable.  
     The fees and expenses of any accountant, broker, financial advisor, 
     legal counsel or other person retained by the Company in connection with 
     this Agreement or the Stockholder Agreement or the transactions 
     contemplated hereby or thereby incurred or to be incurred by the Company 
     in connection with this Agreement and the Stockholder Agreement and the 
     transactions contemplated by this Agreement and the Stockholder 
     Agreement will not exceed the fees and expenses set forth in Section 
     3.01(s) of the Company Disclosure Schedule except under the 
     circumstances discussed by the parties prior to the date hereof.

          (t)  OPINION OF FINANCIAL ADVISOR.  The Company has received the 
     opinion of Goldman, Sachs & Co. to the effect that, as of the date 
     hereof, the consideration to be received in the Merger by the Company's 
     stockholders is fair to the Company's stockholders, a copy of which 
     opinion has been, or promptly upon receipt thereof will be, delivered to 
     Parent.
<PAGE>

                                                                           29

          SECTION 3.02.  REPRESENTATIONS AND WARRANTIES OF PARENT AND SUB. 
Parent and Sub represent and warrant to the Company as follows:

          (a)  ORGANIZATION, STANDING AND CORPORATE POWER.  Each of Parent 
     and Sub is a corporation duly organized, validly existing and in good 
     standing under the laws of the jurisdiction in which it is incorporated 
     and has all requisite corporate power and authority to carry on its 
     business as now being conducted.  Each of Parent and Sub is duly 
     qualified or licensed to do business and is in good standing in each 
     jurisdiction in which the nature of its business or the ownership, 
     leasing or operation of its properties makes such qualification or 
     licensing necessary, other than in such jurisdictions where the failure 
     to be so qualified or licensed or be in good standing individually or in 
     the aggregate would not have a material adverse effect on Parent.  
     Parent has delivered to the Company complete and correct copies of its 
     Certificate of Incorporation and By-Laws and the Certificate of 
     Incorporation and By-Laws of Sub, in each case as amended to the date 
     hereof.

          (b)  AUTHORITY; NONCONTRAVENTION.  Parent and Sub have the 
     requisite corporate power and authority to execute and deliver this 
     Agreement (and, in the case of Parent, the Stockholder Agreement), and 
     to consummate the transactions contemplated by this Agreement (and, in 
     the case of Parent, those contemplated by the Stockholder Agreement).  
     The execution, delivery and performance of this Agreement by Parent and 
     Sub (and, in the case of Parent, the Stockholder Agreement) and the 
     consummation of the transactions contemplated by this Agreement (and, in 
     the case of Parent, those contemplated by the Stockholder Agreement) 
     have been duly authorized by all necessary corporate action on the part 
     of Parent and Sub and no other corporate proceedings on the part of 
     Parent or Sub are necessary to authorize this Agreement (and, in the 
     case of Parent, the Stockholder Agreement) or to consummate the 
     transactions contemplated hereby (or, in the case of Parent, those 
     contemplated by the Stockholder Agreement).  This Agreement (and, in the 
     case of Parent, the Stockholder Agreement) has been duly executed and 
     delivered by Parent and Sub, as applicable, and constitutes a valid and 
     binding obligation of Parent and Sub, as applicable, enforceable against 
     Parent and Sub, as applicable, in accordance with its terms.  The 
     execution and delivery of this Agreement and the Stockholder Agreement 
     do not, and the consummation of the transactions contemplated 
<PAGE>

                                                                            30

     by this Agreement and the Stockholder Agreement and compliance with the 
     provisions of this Agreement and the Stockholder Agreement will not, 
     conflict with, or result in any violation of, or default (with or 
     without notice or lapse of time, or both) under, or give rise to a right 
     of termination, cancelation or acceleration of any obligation or to loss 
     of a material benefit under, or result in the creation of any Lien upon 
     any of the properties or assets of Parent or any of its subsidiaries 
     under, any provision of (i) the Certificate of Incorporation or By-Laws 
     of Parent or Sub or similar organizational documents of any other 
     subsidiary of Parent, (ii) any loan or credit agreement, bond, 
     debenture, note, mortgage, indenture, lease or other material contract, 
     commitment, agreement, arrangement, obligation, undertaking, instrument, 
     permit, concession, franchise or license applicable to Parent, Sub or 
     any other subsidiary of Parent or their respective properties or assets 
     or (iii) subject to the governmental filings and other matters referred 
     to in the following sentence, any (A) statute, law, ordinance, rule or 
     regulation or (B) judgment, order or decree, in each case, applicable to 
     Parent, Sub or any other subsidiary of Parent or their respective 
     properties or assets, other than, in the case of clauses (ii) and (iii), 
     any such conflicts, violations, defaults, rights or Liens that 
     individually or in the aggregate would not (x) have a material adverse 
     effect on Parent, (y) impair in any material respect the ability of each 
     of Parent and Sub to perform its obligations under this Agreement or (z) 
     prevent or materially delay the consummation of any of the transactions 
     contemplated by this Agreement.  No consent, approval, order or 
     authorization of, or registration, declaration or filing with, any 
     Governmental Entity is required by or with respect to Parent, Sub or any 
     other subsidiary of Parent in connection with the execution and delivery 
     of this Agreement (and, in the case of Parent, the Stockholder 
     Agreement) by Parent and Sub or the consummation by Parent and Sub of 
     the Merger or the other transactions contemplated by this Agreement 
     (and, in the case of Parent, those contemplated by the Stockholder 
     Agreement), except for (1) the filing of a premerger notification and 
     report form under the HSR Act, (2) the filing with the SEC of the Form 
     S-4 and such reports under the Exchange Act as may be required in 
     connection with this Agreement or the Stockholder Agreement and the 
     transactions contemplated by this Agreement or the Stockholder 
     Agreement, (3) the filing of the Certificate of Merger with the Delaware 
     Secretary of State and appropriate 
<PAGE>

                                                                            31

     documents with the relevant authorities of other states in which the 
     Company is qualified to do business, (4) filings with the NYSE and (5) 
     such other consents, approvals, orders, authorizations, registrations, 
     declarations and filings (i) as may be required under the "blue sky" 
     laws of various states or (ii) the failure of which to be obtained or 
     made individually or in the aggregate would not have a material adverse 
     effect on Parent, impair in any material respect the ability of Parent 
     or Sub to perform its obligations under this Agreement or prevent or 
     materially delay the consummation of any of the transactions 
     contemplated by this Agreement.

          (c)  PARENT SEC DOCUMENTS.  Parent has filed with the SEC all 
     reports, schedules, forms, statements and other documents required to be 
     filed with the SEC by Parent since January 1, 1996 (the "Parent SEC 
     Documents").  As of their respective dates, the Parent SEC Documents 
     complied in all material respects with the requirements of the 
     Securities Act or the Exchange Act, as the case may be, and the rules 
     and regulations of the SEC promulgated thereunder applicable to such 
     Parent SEC Documents, and none of the Parent SEC Documents at the time 
     they were filed contained any untrue statement of a material fact or 
     omitted to state a material fact required to be stated therein or 
     necessary in order to make the statements therein, in light of the 
     circumstances under which they were made, not misleading. Except to the 
     extent that information contained in any Parent SEC Document has been 
     revised or superseded by a later-filed Parent SEC Document, none of the 
     Parent SEC Documents at the time they were filed contained any untrue 
     statement of a material fact or omitted to state any material fact 
     required to be stated therein or necessary in order to make the 
     statements therein, in light of the circumstances under which they were 
     made, not misleading.  The financial statements of Parent included in 
     the Parent SEC Documents complied as to form in all material respects 
     with applicable accounting requirements and the published rules and 
     regulations of the SEC with respect thereto, have been prepared in 
     accordance with GAAP (except, in the case of unaudited statements, as 
     permitted by Form 10-Q of the SEC) applied on a consistent basis during 
     the periods involved (except as may be indicated in the notes thereto) 
     and fairly presented the consolidated financial position of Parent and 
     its consolidated subsidiaries as of the dates thereof and the 
     consolidated results of their operations and cash flows for the periods 
     then ended 
<PAGE>

                                                                            32

     (subject, in the case of unaudited statements, to normal year-end audit 
     adjustments and the absence of footnotes).

          (d)  INFORMATION SUPPLIED.  None of the information supplied or to 
     be supplied by Parent or Sub specifically for inclusion or incorporation 
     by reference in (i) the Form S-4 will (except to the extent revised or 
     superseded by amendments or supplements contemplated hereby), at the 
     time the Form S-4 is filed with the SEC, at any time it is amended or 
     supplemented or at the time it becomes effective under the Securities 
     Act, contain 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, in light of the circumstances under which they are 
     made, not misleading or (ii) the Proxy Statement will (except to the 
     extent revised or superseded by amendments or supplements contemplated 
     hereby), at the date it is first mailed to the Company's stockholders or 
     at the time of Stockholders Meeting, contain any untrue statement of a 
     material fact or omit to state any material fact required to be stated 
     therein or necessary in order to make the statements therein, in light 
     of the circumstances under which they are made, not misleading.  The 
     Form S-4 will comply as to form in all material respects with the 
     requirements of the Securities Act and the rules and regulations 
     thereunder, except that no representation is made by Parent or Sub with 
     respect to statements made or incorporated by reference therein based on 
     information supplied by the Company specifically for inclusion or 
     incorporation by reference in the Form S-4.

          (e)  ABSENCE OF CERTAIN CHANGES OR EVENTS.  Except as disclosed in 
     the Parent SEC Documents filed by Parent and publicly available prior to 
     the date of this Agreement ("Filed Parent SEC Documents"), since the 
     date of the most recent financial statements included in the Filed 
     Parent SEC Documents, Parent has conducted its business only in the 
     ordinary course consistent with past practice, and there has not been 
     (i) any material adverse change with respect to Parent, (ii) any 
     declaration, setting aside or payment of any dividend on, or other 
     distribution (whether in cash, stock or property) in respect of, any of 
     Parent's capital stock (except for regular quarterly cash dividends) or 
     (iii) any split, combination or reclassification of any of Parent's 
     capital stock or any issuance or the authorization of any issuance of 
<PAGE>

                                                                            33

     any other securities in respect of, in lieu of or in substitution for 
     shares of its capital stock.

          (f)  INTERIM OPERATIONS OF SUB.  Sub was formed solely for the 
     purpose of engaging in the transactions contemplated hereby, has engaged 
     in no other business activities and has conducted its operations only as 
     contemplated hereby.

          (g)  PARENT COMMON STOCK.  The shares of Parent Common Stock to be 
     issued in connection with the Merger, when issued in accordance with the 
     terms and provisions of this Agreement, will be duly authorized, validly 
     issued, fully paid and non-assessable and will not be subject to any 
     preemptive or other statutory right of stockholders and will be issued 
     in compliance with applicable United States Federal and state securities 
     laws.

                                   ARTICLE IV

                    COVENANTS RELATING TO CONDUCT OF BUSINESS

          SECTION 4.01.  CONDUCT OF BUSINESS.  (a)  CONDUCT OF BUSINESS BY 
THE COMPANY.  During the period from the date of this Agreement to the 
Effective Time, the Company shall and shall cause its subsidiaries to, carry 
on their respective businesses in the ordinary course consistent with the 
manner as heretofore conducted and use reasonable efforts to comply in all 
material respects with all applicable laws, rules and regulations and, to the 
extent consistent therewith, use commercially reasonable efforts to preserve 
intact their current business organization, keep available the services of 
their current officers and employees and preserve their relationships with 
customers, suppliers, licensors, licensees, distributors and others having 
business dealings with them.  Without limiting the generality of the 
foregoing, except as set forth in Section 4.01 of the Company Disclosure 
Schedule, during the period from the date of this Agreement to the Effective 
Time, the Company shall not, and shall not permit any of its subsidiaries to:

          (i) (x) declare, set aside or pay any dividends on, or make any 
     other distributions (whether in cash, stock or property) in respect of, 
     any of its capital stock except for dividends by a wholly owned 
     subsidiary of the Company to its parent, (y) split, combine or 
     reclassify any of its capital stock or issue or authorize the issuance 
     of any other securities in 

<PAGE>

                                                                            34

     respect of, in lieu of or in substitution for shares of its capital 
     stock or (z) purchase, redeem or otherwise acquire any shares of its 
     capital stock or any other securities of the Company or its subsidiaries 
     or any options, warrants, calls or rights to acquire any such shares or 
     other securities except for repurchases from employees following their 
     termination pursuant to the terms of their existing stock option or 
     purchase agreements;

          (ii) issue, deliver, sell, pledge or otherwise encumber any shares 
     of its capital stock, any other voting securities or any securities 
     convertible into, or any options, warrants, calls or rights to acquire, 
     any such shares, voting securities or convertible securities (other than 
     (x) the issuance of shares of Company Common Stock upon the exercise of 
     Stock Options outstanding on the date of this Agreement and in 
     accordance with their present terms or as contemplated by Section 5.06), 
     (y) the issuance of shares of Company Common Stock to participants in 
     the ESPP in accordance with its current terms and (z) grants of Stock 
     Options to purchase up to 250,000 shares of Company Common Stock in the 
     ordinary course of business consistent with past practice and with an 
     exercise price per share at least equal to the market value of Company 
     Common Stock on the date of grant, and the issuance of shares of Company 
     Common Stock upon exercise of such Stock Options);

          (iii) amend its certificate of incorporation or bylaws (or similar
     organizational documents);

          (iv) acquire or agree to acquire (x) by merging or consolidating 
     with, or by purchasing a substantial portion of the assets of, or by any 
     other manner, any business or any corporation, partnership, joint 
     venture, association or other entity or division thereof or (y) any 
     assets which, individually, is in excess of $50,000 or, in the 
     aggregate, are in excess of $250,000, except purchases of inventory, 
     components and raw materials in the ordinary course of business 
     consistent with past practice and except for capital expenditures (which 
     are covered by clause (vii) below);

          (v) sell, lease, license, mortgage or otherwise encumber or subject 
     to any Lien or otherwise dispose of any of its properties or assets, 
     except sales of inventory or used equipment in the ordinary course of 
     business consistent with past practice;
<PAGE>

                                                                            35

          (vi) (y) incur any indebtedness for borrowed money or guarantee any 
     such indebtedness of another person, issue or sell any debt securities 
     or options, warrants, calls or other rights to acquire any debt 
     securities of the Company, guarantee any debt securities of another 
     person, enter into any "keep well" or other agreement to maintain any 
     financial statement condition of another person or enter into any 
     arrangement having the economic effect of any of the foregoing, except 
     for short-term borrowings incurred in the ordinary course of business 
     consistent with past practice or (z) make any loans, advances or capital 
     contributions to, or investments in, any other person, other than (I) as 
     provided for under any current Benefit Plan in the ordinary course of 
     business consistent with past practice, (II) to the Company or any 
     direct or indirect wholly owned subsidiary of the Company and (III) for 
     advances to customers and employees, in each case in the ordinary course 
     of business consistent with past practice;

          (vii) make or agree to make any new capital expenditure or 
     expenditures which, individually, is in excess of $50,000 or, in the 
     aggregate, are in excess of $250,000;

          (viii) pay, discharge, settle or satisfy any claims, liabilities or 
     obligations (absolute, accrued, asserted or unasserted, contingent or 
     otherwise), other than the payment, discharge, settlement or 
     satisfaction in the ordinary course of business consistent with past 
     practice or in accordance with their terms, of claims, liabilities or 
     obligations reflected or reserved against in the most recent financial 
     statements (or the notes thereto) of the Company included in the Filed 
     SEC Documents or incurred since the date of such financial statements in 
     the ordinary course of business consistent with past practice, or waive 
     any material benefits of, or agree to modify in any materially adverse 
     respect, any confidentiality, standstill or similar agreements to which 
     the Company or any of its subsidiaries is a party;

          (ix) except in the ordinary course of business, modify, amend or 
     terminate any material contract or agreement to which the Company or 
     such subsidiary is a party or waive, release or assign any material 
     rights or claims thereunder;

          (x) enter into any contracts, agreements, or obligations relating to
     (i) the distribution, sale, 
<PAGE>

                                                                            36

     license or marketing by third parties of the Company's products or 
     products licensed by the Company or (ii) material Intellectual Property 
     (other than in the ordinary course of business consistent with past 
     practice), it being understood that the Company may continue to obtain 
     licenses to Intellectual Property owned by third parties in the ordinary 
     course of business consistent with past practice, execute 
     confidentiality agreements in the ordinary course of business consistent 
     with past practice, and enter into agreements in the ordinary course of 
     business consistent with past practice permitting third parties access 
     to source code held in escrow, other than in the case of clauses (i) and 
     (ii) above, pursuant to any such contracts, agreements or obligations 
     existing as of the date hereof in accordance with their terms; 

          (xi)  except as otherwise contemplated by this Agreement or as 
     required to comply with applicable law or agreements, plans or 
     arrangements existing on the date hereof, (A) terminate, adopt, enter 
     into or amend any collective bargaining agreement or Benefit Plan 
     (except that the Director Plan may be amended to permit the Stock 
     Options outstanding thereunder to be assumed by Parent in connection 
     with the Merger), (B) increase in any manner the compensation or fringe 
     benefits of, or pay any bonus to, any officer, director or employee 
     (except for normal increases of cash compensation or cash bonuses in the 
     ordinary course of business consistent with past practice), (C) pay any 
     material benefit not provided for under any Benefit Plan, (D) increase 
     in any manner the severance or termination pay of any officer or 
     employee, (E) enter into (I) any employment, severance, termination or 
     indemnification agreement, or consulting agreement (other than in the 
     ordinary course of business consistent with past practice), with any 
     current or former officer, director, employee or consultant or (II) any 
     agreements with any current or former officer, director, employee or 
     consultant the benefits of which are contingent, or the terms of which 
     are materially altered, upon the occurrence of a transaction involving 
     the Company of the nature contemplated by this Agreement, (F) grant any 
     awards under any Benefit Plan (including the grant of stock options, 
     stock appreciation rights, stock based or stock related awards, 
     performance units or restricted stock or the removal of existing 
     restrictions in any Benefit Plans or agreements or awards made 
     thereunder) other than as permitted under clause (z) of Section 
     4.01(a)(ii), (G) take any action to fund or in any other way secure the 
     payment of 
<PAGE>

                                                                            37

     compensation or benefits under any employee plan, contract, 
     agreement or arrangement or Benefit Plan or (H), except to the extent 
     required under any Benefit Plan on the date hereof, take any action to 
     accelerate the vesting of payment of any compensation or benefit under 
     any Benefit Plan;

          (xii) except as otherwise contemplated by this Agreement, enter 
     into any contract or agreement that is of a nature required to be filed 
     as an exhibit to Form 10-K under the Exchange Act and the rules and 
     regulations promulgated thereunder, other than contracts for the sale or 
     licensing of the Company's products in the ordinary course of business;

          (xiii) form any subsidiary of the Company;

          (xiv) revalue any of its material assets or, except as required by
     GAAP, make any change in accounting methods, principles or practices; or

          (xv) authorize any of, or commit or agree to take any of, the
     foregoing actions.

          (b)  CERTAIN TAX MATTERS.  During the period from the date of this 
Agreement to the Effective Time, (i) the Company and each of its subsidiaries 
will timely file all Federal, state and local, domestic and foreign, income 
and franchise tax returns and reports ("Post-Signing Returns") required to be 
filed by each such entity (after taking into account any extensions); (ii) 
the Company and each of its subsidiaries will timely pay all taxes due and 
payable with respect to such Post-Signing Returns that are so filed; (iii) 
the Company will accrue a reserve in its books and records and financial 
statements in accordance with past practice for all taxes payable by the 
Company or any of its subsidiaries for which no Post-Signing Return is due 
prior to the Effective Time; (iv) the Company and each of its subsidiaries 
will promptly notify Parent of any suit, claim action, investigation, 
proceeding or audit (collectively, "Actions") pending against or with respect 
to the Company or any of its subsidiaries in respect of any tax where there 
is a reasonable possibility of a determination or decision which would have a 
material adverse effect on the Company's or any of its subsidiaries' tax 
liabilities or tax attributes and will not settle or compromise any such 
Action without Parent's consent; and (v) none of the Company or any of its 
subsidiaries will make any material tax election without Parent's consent, 
which consent shall not be unreasonably withheld.

<PAGE>
                                                                          38


          SECTION 4.02.  NO SOLICITATION.  (a)  The Company shall not, nor 
shall it authorize or permit any of its officers, directors or employees or 
any investment banker, attorney or other advisor or representative retained 
by it or any of its subsidiaries to, directly or indirectly, (i) solicit, 
initiate or encourage the submission of any Takeover Proposal (as hereinafter 
defined) or (ii) participate in any discussions or negotiations regarding, or 
furnish to any person any non-public information with respect to, or take any 
other action to facilitate any inquiries or the making of any proposal that 
constitutes or may reasonably be expected to lead to, any Takeover Proposal; 
PROVIDED, HOWEVER, that if, at any time prior to receipt of the Stockholder 
Approval the Board of Directors of the Company determines in good faith, 
after consultation with outside counsel, that it is necessary to do so in 
order to comply with its fiduciary duties to the Company's stockholders under 
applicable law, the Company may, in response to a Takeover Proposal that was 
unsolicited or that did not otherwise result from a breach of this Section 
4.02(a), and subject to compliance with Section 4.02(c), (x) furnish 
information with respect to the Company to any person pursuant to a customary 
and reasonable confidentiality agreement and (y) participate in negotiations 
regarding such Takeover Proposal. Without limiting the foregoing, it is 
understood that any violation of the restrictions set forth in the preceding 
sentence by any officer, director or employee of the Company or any of its 
subsidiaries or any investment banker, attorney or other advisor or 
representative of the Company or any of its subsidiaries shall be deemed to 
be a breach of this Section 4.02(a) by the Company.  For purposes of this 
Agreement, "Takeover Proposal" means any inquiry, proposal or offer from any 
person relating to any direct or indirect acquisition or purchase of a 
substantial amount of assets of the Company or any of its subsidiaries (other 
than the purchase of the Company's products in the ordinary course of 
business) or more than a 20% interest in the total voting securities of the 
Company or any of its subsidiaries or any tender offer or exchange offer that 
if consummated would result in any person beneficially owning 20% or more of 
the total voting securities of the Company or any of its subsidiaries or any 
merger, consolidation, business combination, sale of substantially all the 
assets, recapitalization, liquidation, dissolution or similar transaction 
involving the Company or any of its subsidiaries, other than the transactions 
contemplated by this Agreement or the Stockholder Agreement.

          (b)  Neither the Board of Directors of the Company nor any committee
thereof shall (i) withdraw or modify, or 



<PAGE>
                                                                          39



propose publicly to withdraw or modify, in a manner adverse to Parent or Sub, 
the approval or recommendation by such Board of Directors or any such 
committee of this Agreement or the Merger, (ii) approve or recommend, or 
publicly propose to approve or recommend, any Takeover Proposal or (iii) 
cause the Company to enter into any letter of intent, agreement in principle, 
acquisition agreement or other similar agreement (an "Acquisition Agreement") 
with respect to any Takeover Proposal.  Notwithstanding the foregoing, prior 
to receipt of the Stockholder Approval, the Board of Directors of the 
Company, to the extent it determines in good faith, after consultation with 
outside counsel, that it is necessary to do so in order to comply with its 
fiduciary duties to the Company's stockholders under applicable law, may 
withdraw or modify its approval or recommendation of this Agreement or the 
Merger, approve or recommend any Superior Proposal (as hereinafter defined) 
or cause the Company to terminate this Agreement in accordance with Section 
7.01(b)(iv) (and concurrently with or after such termination, if it so 
chooses, cause the Company to enter into an Acquisition Agreement with 
respect to a Superior Proposal), in each case at any time after the third 
business day following Parent's receipt of written notice (a "Notice of 
Superior Proposal") advising Parent that the Board of Directors of the 
Company has received a Superior Proposal, specifying the material terms and 
conditions of the Superior Proposal and identifying the person making such 
Superior Proposal (it being understood that any amendment to the price or 
material terms of a Superior Proposal shall require an additional Notice of 
Superior Proposal and an additional one business day period thereafter to the 
extent permitted under applicable law).  For purposes of this Agreement, a 
"Superior Proposal" means any bona fide proposal made by a third party to 
acquire, directly or indirectly, including pursuant to a tender offer, 
exchange offer, merger, consolidation, business combination, 
recapitalization, liquidation, dissolution or similar transaction, for 
consideration consisting of cash and/or securities, more than 50% of the 
voting power of the Company Common Stock or all or substantially all the 
assets of the Company and otherwise on terms which the Board of Directors of 
the Company determines in its good faith judgment (after consultation with a 
financial advisor of nationally recognized reputation) to be more favorable 
to the Company's stockholders than the Merger and for which financing, to the 
extent required, is then committed or which, in the good faith judgment of 
the Board of Directors of the Company, is capable of being obtained by such 
third party.

          (c)  In addition to the obligations of the Company set forth in
paragraphs (a) and (b) of this Section 4.02, 


<PAGE>
                                                                          40



the Company promptly shall advise Parent orally and in writing of any request 
for non-public information which the Company reasonably believes would lead 
to a Takeover Proposal or of any Takeover Proposal, or any inquiry with 
respect to or which the Company reasonably believes would lead to any 
Takeover Proposal, the material terms and conditions of such request, 
Takeover Proposal or inquiry, and the identity of the person making any such 
request, Takeover Proposal or inquiry.  The Company will keep Parent informed 
in all material respects of the status and details (including material 
amendments or proposed amendments) of any such request, Takeover Proposal or 
inquiry.

          (d)  Nothing contained in this Section 4.02 or elsewhere in this
Agreement shall prohibit the Company from (i) taking and disclosing to its
stockholders a position contemplated by Rules 14d-9 and 14e-2(a) promulgated
under the Exchange Act or (ii) making any disclosure to the Company's
stockholders if, in the good faith judgment of the majority of the members of
the Board of Directors of the Company, after consultation with independent
counsel, failure to so disclose would be inconsistent with applicable laws;
PROVIDED that none of the Company nor its Board of Directors nor any committee
thereof shall, except in accordance with the provisions of Section 4.02(b),
withdraw or modify, or publicly propose to withdraw or modify, its position with
respect to this Agreement or the Merger or approve or recommend, or propose to
approve or recommend, a Takeover Proposal.


                                    ARTICLE V

                              ADDITIONAL AGREEMENTS

          SECTION 5.01.  PREPARATION OF THE FORM S-4 AND THE PROXY STATEMENT;
STOCKHOLDERS MEETING.  (a)  As soon as practicable following the date of this
Agreement, the Company and Parent shall prepare and the Company shall file with
the SEC the Proxy Statement and Parent shall prepare and file with the SEC the
Form S-4, in which the Proxy Statement will be included as a prospectus.  Each
of the Company and Parent shall use all reasonable efforts to have the Form S-4
declared effective under the Securities Act as promptly as practicable after
such filing.  The Company will use its reasonable efforts to cause the Proxy
Statement to be mailed to the Company's stockholders as promptly as practicable
after the Form S-4 is declared effective under the Securities Act.  Parent shall
also take any action (other than qualifying to do business in any jurisdiction
in which it is not now so qualified) required to be taken under 


<PAGE>
                                                                          41



any applicable state securities laws in connection with the issuance of 
Parent Common Stock in the Merger and under the Company Stock Plans.  Each of 
Parent and the Company shall furnish all information concerning itself to the 
other as may be reasonably requested in connection with any such action and 
the preparation, filing and distribution of the Proxy Statement.

          (b)  The Company will, as soon as practicable following the date of 
this Agreement, establish a record date (which will be as soon as practicable 
following the date of this Agreement) for, duly call, give notice of, convene 
and hold a meeting of its stockholders (the "Stockholders Meeting") for the 
purpose of obtaining the Stockholder Approval.  The Company will, through its 
Board of Directors, recommend to its stockholders approval and adoption of 
this Agreement, except to the extent that the Board of Directors of the 
Company shall have withdrawn or modified its approval of this Agreement or 
the Merger in accordance with Section 4.02(b) or terminated this Agreement in 
accordance with Section 7.01(b)(iv).  Without limiting the generality of the 
foregoing, the Company agrees that its obligations pursuant to the first 
sentence of this Section 5.01(b) shall not be affected by the commencement, 
public proposal, public disclosure or communication to the Company of any 
Takeover Proposal.

          SECTION 5.02.  LETTERS OF THE COMPANY'S ACCOUNTANTS.  The Company 
shall use its reasonable efforts to cause to be delivered to Parent two 
"comfort" letters in customary form from Coopers & Lybrand L.L.P., the 
Company's independent public accountants, one dated a date within two 
business days before the date on which the Form S-4 shall become effective 
and one dated a date within two business days before the Closing Date, each 
addressed to Parent.

          SECTION 5.03.  LETTERS OF PARENT'S ACCOUNTANTS.  Parent shall use 
its reasonable efforts to cause to be delivered to the Company two "comfort" 
letters in customary form from Price Waterhouse LLP, Parent's independent 
public accountants, one dated a date within two business days before the date 
on which the Form S-4 shall become effective and one dated a date within two 
business days before the Closing Date, each addressed to the Company, in the 
form customarily given to underwriters in securities offerings of Parent in 
the past.

          SECTION 5.04.  ACCESS TO INFORMATION; CONFIDENTIALITY.  The Company
shall, and shall cause each of its subsidiaries to, afford to Parent, and to
Parent's officers, employees, accountants, counsel, financial advisors and 


<PAGE>
                                                                          42



other representatives, reasonable access during normal business hours during 
the period prior to the Effective Time or the termination of this Agreement 
to all their respective properties, books, contracts, commitments, personnel 
and records and, during such period, the Company shall (and shall cause each 
of its subsidiaries to) make available to Parent (a) a copy of each report, 
schedule, form, statement and other document filed or received by it during 
such period pursuant to the requirements of United States Federal or state 
securities laws or the United States Federal tax laws and (b) all other 
information concerning its business, properties and personnel as Parent may 
reasonably request (including Coopers & Lybrand L.L.P.'s work papers).  
Except as required by law, Parent will hold, and will cause its officers, 
employees, accountants, counsel, financial advisors and other representatives 
and controlled affiliates to hold, any and all information received from the 
Company, directly or indirectly, in confidence in accordance with the IBM 
Business Development Agreement for Exchange of Confidential Information dated 
July 9, 1997, between Parent and the Company (as amended on August 18, 1997 
and as it may be further amended from time to time, the "Confidentiality 
Agreement").

          SECTION 5.05.  REASONABLE EFFORTS; NOTIFICATION.  (a)  Upon the terms
and subject to the conditions set forth in this Agreement, each of the parties
agrees to use all reasonable efforts to take, or cause to be taken, all actions,
and to do, or cause to be done, and to assist and cooperate with the other
parties in doing, all things necessary, proper or advisable to consummate and
make effective, in the most expeditious manner practicable, the Merger and the
other transactions contemplated by this Agreement, including using reasonable
efforts to accomplish the following:  (i) the taking of all reasonable acts
necessary to cause the conditions precedent set forth in Article VI to be
satisfied, (ii) the obtaining of all necessary actions or nonactions, waivers,
consents, approvals, orders and authorizations from Governmental Entities and
the making of all necessary registrations, declarations and filings (including
registrations, declarations and filings with Governmental Entities, if any) and
the taking of all reasonable steps as may be necessary to avoid any suit, claim,
action, investigation or proceeding by any Governmental Entity, (iii) the
obtaining of all necessary consents, approvals or waivers from third parties,
(iv) the defending of any suits, claims, actions, investigations or proceedings,
whether judicial or administrative, challenging this Agreement or the
consummation of the transactions contemplated hereby or thereby, including
seeking to have any stay or temporary 


<PAGE>
                                                                          43



restraining order entered by any court or other Governmental Entity vacated 
or reversed and (v) the execution and delivery of any additional instruments 
necessary to consummate the transactions contemplated by, and to fully carry 
out the purposes of, this Agreement.  In connection with and without limiting 
the foregoing, the Company and its Board of Directors shall, if any state 
takeover statute or similar statute or regulation is or becomes applicable to 
the Merger, this Agreement, the Stockholder Agreement, the Open Market 
Purchases or any of the other transactions contemplated by this Agreement or 
the Stockholder Agreement, use all reasonable efforts to ensure that the 
Merger and the other transactions contemplated by this Agreement and the 
Stockholder Agreement may be consummated as promptly as practicable on the 
terms contemplated by this Agreement and the Stockholder Agreement and 
otherwise to minimize the effect of such statute or regulation on the Merger, 
this Agreement, the Stockholder Agreement, the Open Market Purchases and the 
other transactions contemplated by this Agreement.  Nothing in this Agreement 
shall be deemed to require Parent or the Company to dispose of any 
significant asset or collection of assets.

          (b)  The Company shall give prompt notice to Parent of any 
representation or warranty made by it contained in this Agreement becoming 
untrue or inaccurate such that the condition set forth in Section 6.02(a) 
would not be satisfied; PROVIDED, HOWEVER, that no such notification shall 
affect the representations, warranties, covenants or agreements of the 
parties or the conditions to the obligations of the parties under this 
Agreement.

          (c)  Parent shall give prompt notice to the Company of any 
representation or warranty made by it or Sub contained in this Agreement 
becoming untrue or inaccurate such that the condition set forth in Section 
6.03(a) would not be satisfied; PROVIDED, HOWEVER, that no such notification 
shall affect the representations, warranties, covenants or agreements of the 
parties or the conditions to the obligations of the parties under this 
Agreement.

          SECTION 5.06.  STOCK OPTIONS.  (a) As soon as practicable following 
the date of this Agreement, the Board of Directors of the Company (or, if 
appropriate, any committee administering the Company Stock Plans, as defined 
below) shall adopt such resolutions or take such other actions (if any) as 
may be required to effect the following:

          (i)  adjust the terms of all outstanding options to purchase shares of
     Company Common Stock (the "Stock Options") granted under any plan or
     arrangement 



<PAGE>
                                                                          44



     providing for the grant of options to purchase shares of Company 
     Common Stock to current or former officers, directors, employees or
     consultants of the Company (the "Company Stock Plans"), whether vested or
     unvested, as necessary to provide that, at the Effective Time, each Stock
     Option outstanding immediately prior to the Effective Time shall be amended
     and converted into an option to acquire, on the same terms and conditions
     as were applicable under the Stock Option, the number of shares of Parent
     Common Stock (rounded down to the nearest whole share) determined by
     multiplying the number of shares of Company Common Stock subject to such
     Stock Option by the Exchange Ratio, at a price per share of Parent Common
     Stock equal to (A) the aggregate exercise price for the shares of Company
     Common Stock otherwise purchasable pursuant to such Stock Option divided by
     (B) the number of shares of Parent Common Stock deemed purchasable pursuant
     to such Stock Option (each, as so adjusted, an "Adjusted Option"); PROVIDED
     that such exercise price shall be rounded up to the nearest whole cent; and

          (ii) make such other changes to the Company Stock Plans as Parent and
     the Company may agree are appropriate to give effect to the Merger.

          (b)  The adjustments provided herein with respect to any Stock 
Options that are "incentive stock options" as defined in Section 422 of the 
Code shall be and are intended to be effected in a manner which is consistent 
with Section 424(a) of the Code.

          (c)  At the Effective Time, by virtue of the Merger and without the 
need of any further corporate action, Parent shall assume the Company Stock 
Plans, with the result that all obligations of the Company under the Company 
Stock Plans, including with respect to Stock Options outstanding at the 
Effective Time, shall be obligations of Parent following the Effective Time.  
  
          (d)  No later than the Effective Time, Parent shall prepare and 
file with the SEC a registration statement on Form S-8 (or another 
appropriate form) registering a number of shares of Parent Common Stock equal 
to the number of shares subject to the Adjusted Options.  Such registration 
statement shall be kept effective (and the current status of the prospectus 
or prospectuses required thereby shall be maintained) at least for so long as 
any Adjusted Options may remain outstanding.


<PAGE>
                                                                          45



          (e)  As soon as practicable after the Effective Time, Parent shall
deliver to the holders of Stock Options appropriate notices setting forth such
holders' rights pursuant to the respective Company Stock Plans and the
agreements evidencing the grants of such Stock Options and that such Stock
Options and agreements shall be assumed by Parent and shall continue in effect
on the same terms and conditions (subject to the adjustments required by this
Section 5.06 after giving effect to the Merger).

          (f)  A holder of an Adjusted Option may exercise such Adjusted 
Option in whole or in part in accordance with its terms by delivering a 
properly executed notice of exercise to Parent, together with the 
consideration therefor and the United States Federal withholding tax 
information, if any, required in accordance with the related Company Stock 
Plan.

          (g)  Except as otherwise contemplated by this Section 5.06 and 
except to the extent required under the respective terms of the Stock 
Options, all restrictions or limitations on transfer and vesting with respect 
to Stock Options awarded under the Company Stock Plans or any other plan, 
program or arrangement of the Company, to the extent that such restrictions 
or limitations shall not have already lapsed, shall remain in full force and 
effect with respect to such options after giving effect to the Merger and the 
assumption by Parent as set forth above.

          (h)  The Company shall terminate the ESPP by having its Board of 
Directors amend the ESPP as necessary to provide that:  (i) any shares of 
Company Common Stock to be purchased under the ESPP shall be purchased under 
the ESPP on a new "Exercise Date" (as such term is defined in the ESPP) set 
by the Board of Directors, which Exercise Date shall be on the last trading 
day immediately prior to the Effective Time, or such earlier time as the 
Board shall specify, and (ii) immediately following such purchase of shares 
of Company Common Stock, the ESPP shall terminate.

          SECTION 5.07.  INDEMNIFICATION.  (a)  From and after the consummation
of the Merger, Parent will, and will cause the Surviving Corporation to, fulfill
and honor in all respects the obligations of the Company pursuant to (i) each
indemnification agreement in effect at such time between the Company and each
person who is or was a director or officer of the Company at or prior to the
Effective Time and (ii) any indemnification provisions under the Company's
Certificate of Incorporation or By laws as each is in effect on the date hereof
(the persons to be indemnified pursuant to the agreements or provisions referred
to in clauses (i) 


<PAGE>
                                                                          46



and (ii) of this Section 5.07(a), the "Indemnified Parties"). The Certificate 
of Incorporation and By-laws of the Surviving Corporation shall contain the 
provisions with respect to indemnification and exculpation from liability set 
forth in the Company's Certificate of Incorporation and By-laws on the date 
of this Agreement, which provisions shall not be amended, repealed or 
otherwise modified for a period of six years after the Effective Time in any 
manner that would adversely affect the rights thereunder of any Indemnified 
Party; PROVIDED, HOWEVER, that Parent shall not be required to maintain the 
Surviving Corporation's existence as a separate corporation.  Until the 
earlier to occur of (i) six years from the Effective Time and (ii) the 
expiration of the current term of the Company's directors' and officers' 
liability insurance policy (the "Company Policy"), Parent shall maintain in 
effect the Company Policy (or, in lieu of maintaining such insurance, cause 
coverage to be provided under any policy maintained for the benefit of Parent 
or any of its subsidiaries or otherwise obtained by Parent, so long as the 
terms thereof are no less advantageous to the intended beneficiaries thereof 
than those of the Company Policy), covering those persons who are covered by 
the Company Policy; PROVIDED, HOWEVER, that in no event shall Parent be 
required to expend in any one year an amount in excess of 200% of the annual 
premiums most recently paid by the Company for such insurance, and, PROVIDED, 
FURTHER, that if the annual premiums of such insurance coverage exceed such 
amount, Parent shall only be obligated to obtain the greatest coverage 
available under such policy for a cost not exceeding such amount.

          (b) This Section 5.07 shall survive the consummation of the Merger 
at the Effective Time, is intended to be for the benefit of the Company, 
Parent, the Surviving Corporation and each Indemnified Party and such 
Indemnified Party's heirs and representatives, and shall be binding on all 
successors and assigns of Parent and the Surviving Corporation.

          SECTION 5.08.  FEES AND EXPENSES.  (a)  All fees and expenses 
incurred in connection with the Merger, this Agreement, the Stockholder 
Agreement and the transactions contemplated by this Agreement and the 
Stockholder Agreement shall be paid by the party incurring such fees or 
expenses, whether or not the Merger is consummated, except that expenses 
incurred in connection with filing, printing and mailing the Proxy Statement 
and the Form S-4, shall be shared equally by Parent and the Company.

          (b)  In the event that this Agreement is terminated by any party
hereto pursuant to 


<PAGE>
                                                                          47



Section 7.01(b)(iv), the Company shall promptly, but in no event later than 
two days after the date of such termination, pay Parent a fee equal to $6 
million in immediately available funds (the "Termination Fee").  If, at the 
time of any termination of this Agreement by any party hereto pursuant to 
Section 7.01(b)(i), 7.01(b)(iii) or 7.01(c), a Takeover Proposal shall have 
been publicly announced or otherwise publicly disclosed and not publicly 
withdrawn and prior to the date 12 months following the date of the 
termination of this Agreement the Company shall either (x) consummate a 
Company Acquisition (as hereinafter defined) or (y) enter into a written 
Acquisition Agreement providing for a Company Acquisition, then the Company 
shall pay to Parent the Termination Fee in immediately available funds in the 
case of clause (x) concurrently with the consummation of such Company 
Acquisition or in the case of clause (y) concurrently with the consummation 
of the transaction subject to such Acquisition Agreement (whether or not such 
transaction is consummated prior to the date 12 months following the date of 
the termination of this Agreement, but only in the event that such 
transaction subject to such Acquisition Agreement is in fact consummated); 
provided, however, that no Termination Fee shall be payable pursuant to this 
sentence if this Agreement is terminated pursuant to Section 7.01(b)(iii) and 
a material adverse change with respect to Parent had occurred and had not 
been cured prior to the date of the Stockholders Meeting. The Company 
acknowledges that the agreements contained in this Section 5.08(b) are an 
integral part of the transactions contemplated by this Agreement, and that, 
without these agreements, Parent would not enter into this Agreement; 
accordingly, if the Company fails promptly to pay the amounts due pursuant to 
this Section 5.08(b), and, in order to obtain such payment, Parent commences 
a suit which results in a judgment against the Company for the amounts set 
forth in this Section 5.08(b), the Company shall pay to Parent its reasonable 
costs and expenses (including attorneys' fees and expenses) in connection 
with such suit, together with interest on the amounts set forth in this 
Section 5.08(b) at the prime rate of The Chase Manhattan Bank in effect on 
the date such payment was required to be made.  "Company Acquisition" shall 
mean any of the following transactions or series of related transactions:  
(i) a merger, consolidation, business combination, recapitalization, 
liquidation, dissolution or similar transaction involving the Company 
pursuant to which the stockholders of the Company immediately preceding such 
transaction or series of related transactions hold less than 60% of the 
equity interests in the surviving or resulting entity of such transaction or 
transactions (other than the transactions  contemplated by this Agreement); 
(ii) a sale 


<PAGE>
                                                                          48



by the Company of assets (excluding inventory and used equipment sold in the 
ordinary course of business) representing in excess of 40% of the fair market 
value of the Company's business immediately prior to such sale; or (iii) the 
acquisition by any person or group (including by way of a tender offer or an 
exchange offer or issuance by the Company), directly or indirectly, of 
beneficial ownership or a right to acquire beneficial ownership of 40% or 
more of the then outstanding shares of capital stock of the Company.

          SECTION 5.09.  PUBLIC ANNOUNCEMENTS.  Parent and Sub, on the one 
hand, and the Company, on the other hand, will, to the extent reasonably 
practicable, consult with each other before issuing, and give each other the 
opportunity to review and comment upon, any press release or other public 
statements with respect to the transactions contemplated by this Agreement, 
the Stockholder Agreement or the Noncompetition Agreements, including the 
Merger, and shall not issue any such press release or make any such public 
statement prior to such consultation, except as may be required by applicable 
law, court process or by obligations pursuant to any listing agreement with 
any national securities exchange or national securities quotation system.  
The parties agree that the initial press release to be issued with respect to 
the transactions contemplated by this Agreement shall be in the form 
heretofore agreed to by the parties.

          SECTION 5.10.  AFFILIATES.  Prior to the Closing Date, the Company 
shall deliver to Parent a letter identifying all persons who are, in the 
Company's reasonable judgment, at the time this Agreement is submitted for 
approval and adoption to the stockholders of the Company, "affiliates" of the 
Company for purposes of Rule 145 under the Securities Act.  The Company shall 
use its reasonable efforts to cause each such person to deliver to Parent on 
or prior to the Closing Date a written agreement substantially in the form 
attached as Exhibit A hereto.

          SECTION 5.11.  STOCK EXCHANGE LISTING.  To the extent Parent does 
not issue treasury shares in the Merger or under the Company Stock Plans 
which are already listed, Parent shall use its reasonable efforts to cause 
the shares of Parent Common Stock to be issued in the Merger and under the 
Company Stock Plans to be approved for listing on the NYSE, subject to 
official notice of issuance, prior to the Closing Date. 

          SECTION 5.12.  STOCKHOLDER AGREEMENT LEGEND.  The Company will
inscribe upon any Certificate representing 


<PAGE>
                                                                          49



Subject Shares tendered by a Stockholder (as such terms are defined in the 
Stockholder Agreement) for such purpose the following legend:  "THE SHARES OF 
COMMON STOCK, PAR VALUE $.001 PER SHARE, OF UNISON SOFTWARE, INC. REPRESENTED 
BY THIS CERTIFICATE ARE SUBJECT TO A STOCKHOLDER AGREEMENT DATED AS OF 
SEPTEMBER 12, 1997, AND ARE SUBJECT TO TERMS THEREOF.  COPIES OF SUCH 
AGREEMENT MAY BE OBTAINED AT THE PRINCIPAL EXECUTIVE OFFICES OF UNISON 
SOFTWARE, INC.".

          SECTION 5.13.  TAX TREATMENT.  (a) The parties intend the Merger to 
qualify as a reorganization under Section 368(a) of the Code.  Each party and 
its affiliates shall use reasonable efforts to cause the Merger to so qualify 
and to obtain the opinions of Wilson Sonsini Goodrich & Rosati, counsel to 
the Company, and Cravath, Swaine & Moore, counsel to Parent, in each case to 
the effect that the Merger will be treated for United States Federal income 
tax purposes as a "reorganization" within the meaning of Section 368(a) of 
the Code and that Parent, Sub and Company will each be a party to that 
reorganization within the meaning of Section 368(b) of the Code; it being 
understood that in rendering such opinions, such tax counsel shall be 
entitled to rely upon representations provided by the parties hereto and 
certain Company stockholders contained in certain customary representation 
letters as reasonably requested by such counsel.  Each of Parent, the Company 
and their respective affiliates shall not take any action and shall not fail 
to take any action or suffer to exist any condition which action or failure 
to act or condition would prevent, or would be reasonably likely to prevent, 
the Merger from qualifying as a reorganization within the meaning of Section 
368(a) of the Code, and each shall use reasonable efforts to obtain the 
opinion of counsel referred to in Sections 6.02(e) and 6.03(c).

          (b)  In the event of the issuance of final or temporary Treasury 
regulations relating to the continuity of shareholder interest (proposed 
regulations on the topic were issued in the Federal Register on December 23, 
1996 (Reg-252231-96); these regulations would, among other things, add a new 
section 1.368-1(e) to existing regulations), the parties agree to use their 
reasonable best efforts to take advantage of, and comply with, any provisions 
therein (such as an election and/or reporting requirements) to the extent 
necessary to cause such regulations to apply to the Merger. 


<PAGE>
                                                                          50



                                   ARTICLE VI

                              CONDITIONS PRECEDENT

          SECTION 6.01.  CONDITIONS TO EACH PARTY'S OBLIGATION TO EFFECT THE
MERGER.  The respective obligation of each party to effect the Merger is subject
to the satisfaction or waiver on or prior to the Closing Date of the following
conditions:

          (a)  STOCKHOLDER APPROVAL.  This Agreement shall have been approved
     and adopted by the affirmative vote of the holders of a majority of the
     outstanding shares of Company Common Stock.

          (b)  NYSE LISTING.  The shares of Parent Company Stock issuable to the
     Company's stockholders in the Merger and under the Company Stock Plans
     shall have been approved for listing on the NYSE, subject to official
     notice of issuance.

          (c)  HSR ACT.  The waiting period (and any extension thereof)
     applicable to the Merger under the HSR Act shall have been terminated or
     shall have expired.

          (d)  NO INJUNCTIONS OR RESTRAINTS.  No temporary restraining order,
     preliminary or permanent injunction or other order issued by any court of
     competent jurisdiction or statute, rule or regulation (collectively,
     "Restraints") preventing the consummation of the Merger shall be in effect.

          (e)  FORM S-4.  The Form S-4 shall have become effective under the
     Securities Act and shall not be the subject of any stop order or
     proceedings seeking a stop order.

          (f)  TAX OPINIONS.  The opinions of Wilson Sonsini Goodrich & Rosati,
     counsel to the Company, and Cravath, Swaine & Moore, counsel to Parent,
     shall have been delivered to the Company and Parent, respectively, in form
     and substance reasonably satisfactory to the Company and Parent,
     respectively, stating that the Merger will be treated for United States
     Federal income tax purposes as a "reorganization" within the meaning of
     Section 368(a) of the Code and that Parent, Sub and the Company will each
     be a party to that reorganization within the meaning of Section 368(b) of
     the Code.  In rendering such opinions, such counsel shall be entitled to
     rely upon customary representations reasonably 


<PAGE>
                                                                          51



     requested by such counsel and made by Parent, Sub, Company and certain 
     Company stockholders.  The opinions shall be dated the date that is 
     two business days prior to the date the Proxy Statement is first mailed 
     to stockholders of the Company and shall not have been withdrawn or 
     modified in any material respect.

          SECTION 6.02.  CONDITIONS TO OBLIGATIONS OF PARENT AND SUB.  The
obligations of Parent and Sub to effect the Merger are further subject to the
satisfaction or waiver on or prior to the Closing Date of the following
conditions:

          (a) REPRESENTATIONS AND WARRANTIES.  The representations and
     warranties of the Company contained in this Agreement shall be true and
     correct as of the date of this Agreement and as of the Closing Date as
     though made on the Closing Date except (i) to the extent such
     representations and warranties expressly relate to an earlier date (in
     which case such representations and warranties shall be true and correct on
     and as of such specific date) and (ii) for breaches of representations and
     warranties as to matters that, individually or in the aggregate, would not
     have a material adverse effect on the Company.  Solely for the purpose of
     the application of clause (ii) above, all representations and warranties of
     the Company set forth in this Agreement that are qualified as to
     materiality (including without limitation by the word "material" in the
     phrases "material adverse change" or "material adverse effect") shall be
     deemed to be not so qualified.  Parent shall have received a certificate
     signed on behalf of the Company by the chief executive officer and the
     chief financial officer of the Company to such effect.

          (b)  PERFORMANCE OF OBLIGATIONS OF THE COMPANY.  The Company shall
     have performed in all material respects all material obligations required
     to be performed by it under this Agreement at or prior to the Closing Date,
     and Parent shall have received a certificate signed on behalf of the
     Company by the chief executive officer and the chief financial officer of
     the Company to such effect.

          (c)  LETTERS FROM COMPANY AFFILIATES.  Parent shall have received from
     each person named in the letter referred to in Section 5.10(a) an executed
     copy of an agreement substantially in the form of Exhibit A hereto.


<PAGE>
                                                                          52



          (d)  NO GOVERNMENTAL LITIGATION.  There shall not be pending any suit,
     action, investigation or proceeding by any Governmental Entity,
     (i) challenging the acquisition by Parent or Sub of any shares of Company
     Common Stock, seeking to restrain or prohibit the consummation of the
     Merger or seeking to place material limitations on the ownership of shares
     of Company Common Stock (or shares of common stock of the Surviving
     Corporation) by Parent or Sub, (ii) seeking to prohibit or materially limit
     the ownership or operation by the Company, Parent or any of Parent's
     subsidiaries of any material portion of any business or of any assets of
     the Company, Parent or any of Parent's subsidiaries, or to compel the
     Company, Parent or any of Parent's subsidiaries to dispose of or hold
     separate any material portion of any business or of any assets of the
     Company, Parent or any of Parent's subsidiaries, as a result of the Merger
     or (iii) seeking to prohibit Parent or any of its subsidiaries from
     effectively controlling in any material respect the business or operations
     of the Company.

          SECTION 6.03.  CONDITIONS TO OBLIGATION OF THE COMPANY.  The
obligation of the Company to effect the Merger is further subject to the
satisfaction or waiver on or prior to the Closing Date of the following
conditions:

          (a)  REPRESENTATIONS AND WARRANTIES.  The representations and
     warranties of Parent and Sub contained in this Agreement shall be true and
     correct as of the date of this Agreement and as of the Closing Date as
     though made on the Closing Date except (i) to the extent such
     representations and warranties expressly relate to an earlier date (in
     which case such representations and warranties shall be true and correct on
     and as of such specific date) and (ii) for breaches of representations and
     warranties as to matters that, individually or in the aggregate, would not
     have a material adverse effect on Parent and Sub.  Solely for the purpose
     of the application of clause (ii) above, all representations and warranties
     of Parent and Sub set forth in this Agreement that are qualified as to
     materiality (including without limitation by the word "material" in the
     phrases "material adverse change" or "material adverse effect") shall be
     deemed to be not so qualified.  The Company shall have received a
     certificate signed on behalf of Parent by an authorized signatory of Parent
     to such effect.


<PAGE>
                                                                          53



          (b)  PERFORMANCE OF OBLIGATIONS OF PARENT AND SUB.  Parent and Sub
     shall have performed in all material respects all obligations required to
     be performed by them under this Agreement at or prior to the Closing Date,
     and the Company shall have received a certificate signed on behalf of
     Parent by an authorized signatory of Parent to such effect.

          SECTION 6.04.  FRUSTRATION OF CLOSING CONDITIONS.  None of the
Company, Parent or Sub may rely on the failure of any condition set forth in
Section 6.01, 6.02 or 6.03, as the case may be, to be satisfied if such failure
was caused by such party's failure to use reasonable efforts to consummate the
Merger and the other transactions contemplated by this Agreement, as required by
and subject to Section 5.05.


                                   ARTICLE VII

                        TERMINATION, AMENDMENT AND WAIVER

          SECTION 7.01.  TERMINATION.  This Agreement may be terminated, and the
Merger contemplated hereby may be abandoned, at any time prior to the Effective
Time, whether before or after the Stockholder Approval:  

          (a)  by mutual written consent of Parent, Sub and the Company;

          (b)  by either Parent or the Company:

               (i) if the Merger shall not have been consummated by March 15,
          1998 for any reason; PROVIDED HOWEVER, that the right to terminate
          this Agreement under this Section 7.01(b)(i) shall not be available to
          any party whose action or failure to act has been a principal cause of
          or resulted in the failure of the Merger to occur on or before such
          date and such action or failure to act constitutes a breach of this
          Agreement;

               (ii) if any Restraint having any of the effects set forth in
          Section 6.01(d) shall be in effect and shall have become final and
          nonappealable; 

               (iii) if the Stockholder Approval shall not have been obtained at
          the Stockholders Meeting duly convened therefor or at any adjournment
          or postponement thereof or by written consent; or


<PAGE>
                                                                          54



               (iv) if the Board of Directors of the Company has made the
          determination that a proposal constitutes a Superior Proposal;
          PROVIDED, HOWEVER, that the Company may not terminate this Agreement
          pursuant to this Section 7.01(b)(iv) unless and until the Company has
          complied with the notice and waiting period procedures set forth in
          Section 4.02(b) and no later than two days after such determination
          the Company pays to Parent the amounts specified under Section 5.08(b)
          pursuant to the terms of such Section 5.08(b). 

          (c) by Parent if (i) the Board of Directors of the Company or any
     committee thereof shall have withdrawn or modified in a manner adverse to
     Parent its approval or recommendation of the Merger or this Agreement or
     failed to reconfirm its recommendation within 15 business days after a
     written request to do so, or approved or recommended any Takeover Proposal
     or (ii) the Board of Directors of the Company shall have resolved to take
     any of the foregoing actions;

          (d) by the Company, upon a breach of any representation, warranty,
     covenant or agreement on the part of Parent set forth in this Agreement, or
     if any such representation or warranty of Parent shall have become
     inaccurate, in either case such that the conditions set forth in
     Section 6.03(a) or Section 6.03(b), as the case may be, would not be
     satisfied as of the time of such breach or as of the time such
     representation or warranty shall have become inaccurate; PROVIDED, that if
     such breach by Parent or inaccuracy in Parent's representations and
     warranties is curable by Parent through the exercise of its reasonable
     efforts, then (i) the Company may not terminate this Agreement under this
     Section 7.01(d) with respect to a particular breach or inaccuracy prior to
     or during the 45-day period commencing upon delivery by the Company of
     written notice to Parent describing such breach or inaccuracy, provided
     Parent continues to exercise reasonable efforts to cure such breach or
     inaccuracy and (ii) the Company may not, in any event, terminate this
     Agreement under this Section 7.01(d) if such inaccuracy or breach shall
     have been cured in all material respects during such 45-day period; and,
     provided further that the Company may not terminate this Agreement pursuant
     to this Section 7.01(d) if it shall have wilfully and materially breached
     this Agreement; or


<PAGE>
                                                                          55



          (e) by Parent, upon a breach of any representation, warranty, covenant
     or agreement on the part of the Company set forth in this Agreement, or if
     any such representation or warranty of the Company shall have become
     inaccurate, in either case such that the conditions set forth in
     Section 6.02(a) or Section 6.02(b), as the case may be, would not be
     satisfied as of the time of such breach by the Company or as of the time
     such representation or warranty shall have become inaccurate; PROVIDED,
     that if such breach by the Company or inaccuracy in the Company's
     representations and warranties is curable by the Company through the
     exercise of its reasonable efforts, then (i) Parent may not terminate this
     Agreement under this Section 7.01(e) with respect to a particular breach or
     inaccuracy prior to or during the 45-day period commencing upon delivery by
     Parent of written notice to the Company describing such breach or
     inaccuracy, provided the Company continues to exercise reasonable efforts
     to cure such breach or inaccuracy and (ii) Parent may not, in any event,
     terminate this Agreement under this Section 7.01(e) if such inaccuracy or
     breach shall have been cured in all material respects during such 45-day
     period; and PROVIDED FURTHER that Parent may not terminate this Agreement
     pursuant to this Section 7.01(e) if it shall have wilfully and materially
     breached this Agreement.

          SECTION 7.02.  EFFECT OF TERMINATION.  In the event of termination of
this Agreement by either the Company or Parent as provided in Section 7.01, this
Agreement shall forthwith become void and have no effect, without any liability
or obligation on the part of Parent, Sub or the Company, other than the
provisions of Section 3.01(s), the last sentence of Section 5.04, Section 5.08,
Section 5.09, this Section 7.02 and Article VIII and except to the extent that
such termination results from the wilful and material breach by a party of any
of its representations, warranties, covenants or agreements set forth in this
Agreement.

          SECTION 7.03.  AMENDMENT.  This Agreement may be amended by the
parties hereto at any time before or after any required approval of matters
presented in connection with the Merger by the stockholders of the Company;
PROVIDED, HOWEVER, that after any such approval, there shall be made no
amendment that by law requires further approval by such stockholders without the
further approval of such stockholders.  This Agreement may not be amended except
by an instrument in writing signed on behalf of each of the parties hereto.


<PAGE>
                                                                          56



          SECTION 7.04.  EXTENSION; WAIVER.  At any time prior to the Effective
Time, the parties may (a) extend the time for the performance of any of the
obligations or other acts of the other parties, (b) waive any inaccuracies in
the representations and warranties contained herein or in any document delivered
pursuant hereto or (c) subject to the proviso of Section 7.03, waive compliance
with any of the agreements or conditions contained herein.  Any agreement on the
part of a party to any such extension or waiver shall be valid only if set forth
in an instrument in writing signed on behalf of such party.  The failure of any
party to this Agreement to assert any of its rights under this Agreement or
otherwise shall not constitute a waiver of such rights.


                                  ARTICLE VIII

                               GENERAL PROVISIONS

          SECTION 8.01.  NONSURVIVAL OF REPRESENTATIONS AND WARRANTIES.  None of
the representations and warranties in this Agreement or in any instrument
delivered pursuant to this Agreement shall survive the Effective Time.  This
Section 8.01 shall not limit any covenant or agreement of the parties which by
its terms contemplates performance after the Effective Time.

          SECTION 8.02.  NOTICES.  All notices, requests, claims, demands and
other communications hereunder shall be in writing and shall be deemed given if
delivered personally or sent by overnight courier (providing proof of delivery)
to the parties at the following addresses (or at such other address for a party
as shall be specified by like notice):

          if to Parent or Sub, to:

               International Business
               Machines Corporation
               New Orchard Road
               Armonk, NY 10504

               Attention:  Lee A. Dayton

               with a copy to:

               Cravath, Swaine & Moore
               Worldwide Plaza
               825 Eighth Avenue
               New York, NY 10019

               Attention:  Allen Finkelson, Esq.


<PAGE>
                                                                          57



          if to the Company, to:

               Unison Software, Inc.
               5101 Patrick Henry Drive
               Santa Clara, CA 95054

               Attention: Don Lee

               with a copy to:

               Wilson Sonsini Goodrich & Rosati
               650 Page Mill Road
               Palo Alto, CA 94304

               Attention:   Larry Sonsini, Esq.
                            Jeffrey Saper, Esq.
                            Marty Korman, Esq.
                          

          SECTION 8.03.  DEFINITIONS.  For purposes of this Agreement:

          (a) an "affiliate" of any person means another person that directly or
     indirectly, through one or more intermediaries, controls, is controlled by,
     or is under common control with, such first person;

          (b) as it relates to the Company, "knowledge" means, with respect to
     any matter in question, that any of the chief executive officer, chief
     financial officer or any other executive officer of the Company has actual
     knowledge of such matter.

          (c) "made available" shall mean that the information referred to has
     been made available if requested by the party to whom information is to be
     made available.

          (d) "material adverse change" or "material adverse effect" means, when
     used in connection with the Company or Parent, as the case may be, any
     state of facts, change, effect or occurrence that is or is reasonably
     likely to be materially adverse to the business, financial condition or
     results of operations of such party and its subsidiaries, taken as a whole,
     as the case may be; PROVIDED, HOWEVER, that any state of facts, change,
     effect or occurrence (i) relating to the economy in general or such
     entity's industry in general and not specifically relating to such entity
     shall not be taken into account in determining whether there has 


<PAGE>
                                                                          58



     been or would be a "material adverse change" or a "material adverse 
     effect" on or with respect to such entity and (ii) (x) directly 
     attributable to the announcement or pendency of this Agreement or the 
     pendency of the Merger, or (y) resulting from the failure to obtain a 
     consent or waiver with respect to an agreement to which the Company is 
     a party that is listed on Section 3.01(d) of the Company Disclosure 
     Schedule as requiring a consent or waiver in connection with this 
     Agreement and the consummation of the Merger shall not be taken into 
     account in determining whether there has been or would be a "material 
     adverse change" or a "material adverse effect" on or with respect to 
     the Company;

          (e) "person" means an individual, corporation, partnership, joint
     venture, association, trust, unincorporated organization or other entity;
     and

          (f) a "subsidiary" of any person means another person, an amount of
     the voting securities or other voting ownership or voting partnership
     interests of which is sufficient to elect at least a majority of its Board
     of Directors or other governing body (or, if there are no such voting
     interests, 50% or more of the equity interests of which) is owned directly
     or indirectly by such first person.

          SECTION 8.04.  INTERPRETATION.  When a reference is made in this
Agreement to a Section, Exhibit or Schedule, such reference shall be to a
Section of, or an Exhibit or Schedule to, this Agreement unless otherwise
indicated.  The table of contents and headings contained in this Agreement are
for reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement.  Whenever the words "include", "includes" or
"including" are used in this Agreement, they shall be deemed to be followed by
the words "without limitation".

          SECTION 8.05.  COUNTERPARTS.  This Agreement may be executed in one or
more counterparts, all of which shall be considered one and the same agreement
and shall become effective when one or more counterparts have been signed by
each of the parties and delivered to the other parties.

          SECTION 8.06.  ENTIRE AGREEMENT; NO THIRD-PARTY BENEFICIARIES.  This
Agreement, the Stockholder Agreement,  the Noncompetition Agreements and the
Confidentiality Agreement (a) constitute the entire agreement, and supersede all
prior agreements and understandings, both written and oral, among the parties
with respect to the subject matter 


<PAGE>
                                                                          59



of this Agreement, the Stockholder Agreement, the Noncompetition Agreements 
and the Confidentiality Agreement and (b) except for the provisions of 
Article II, Section 5.06 and Section 5.07, are not intended to confer upon 
any person other than the parties hereto any rights or remedies.

          SECTION 8.07.  GOVERNING LAW.  This Agreement shall be governed by,
and construed in accordance with, the laws of the State of Delaware, regardless
of the laws that might otherwise govern under applicable principles of conflicts
of laws thereof.

          SECTION 8.08.  ASSIGNMENT.  Neither this Agreement nor any of the
rights, interests or obligations hereunder shall be assigned, in whole or in
part, by operation of law or otherwise by any of the parties without the prior
written consent of the other parties, except that Sub may assign, in its sole
discretion, any of or all its rights, interests and obligations under this
Agreement to Parent or to any direct or indirect wholly owned subsidiary of
Parent, but no such assignment shall relieve Sub of any of its obligations
hereunder.  Subject to the preceding sentence, this Agreement will be binding
upon, inure to the benefit of and be enforceable by, the parties and their
respective successors and assigns.

          SECTION 8.09.  ENFORCEMENT.  The parties agree that irreparable damage
would occur in the event that any of the provisions of this Agreement were not
performed in accordance with their specific terms or were otherwise breached. 
It is accordingly agreed that the partes shall be entitled to an injunction or
injunctions to prevent breaches of this Agreement and to enforce specifically
the terms and provisions of this Agreement in any court of the United States
located in the State of Delaware or in any Delaware state court, this being in
addition to any other remedy to which they are entitled at law or in equity.  In
addition, each of the parties hereto (a) consents to submit itself to the
personal jurisdiction of any court of the United States located in the State of
Delaware or of any Delaware state court in the event any dispute arises out of
this Agreement or the transactions contemplated by this Agreement, (b) agrees
that it will not attempt to deny or defeat such personal jurisdiction by motion
or other request for leave from any such court and (c) agrees that it will not
bring any action relating to this Agreement or the transactions contemplated by
this Agreement in any court other than a court of the United States located in
the State of Delaware or a Delaware state court.



<PAGE>
                                                                          60



          SECTION 8.10.  SEVERABILITY.  If any term or other provision of this
Agreement is invalid, illegal or incapable of being enforced by any rule of law
or public policy, all other conditions and provisions of this Agreement shall
nevertheless remain in full force and effect.  Upon such determination that any
term or other provision is invalid, illegal or incapable of being enforced, the
parties hereto shall negotiate in good faith to modify this Agreement so as to
effect the original intent of the parties as closely as possible to the fullest
extent permitted by applicable law in an acceptable manner to the end that the
transactions contemplated hereby are fulfilled to the extent possible.


          IN WITNESS WHEREOF, Parent, Sub and the Company have caused this
Agreement to be signed by their respective officers thereunto duly authorized,
all as of the date first written above.


                         INTERNATIONAL BUSINESS MACHINES CORPORATION,

                           by     /s/ Lee A. Dayton
                              ---------------------------------------
                              Name:    Lee A. Dayton
                              Title:   Vice President
                                       Corporate Development &
                                       Real Estate

                         NEW ORCHARD CORP.,

                           by     /s/ Lee A. Dayton
                              ---------------------------------------
                              Name:    Lee A. Dayton
                              Title:   President


                         UNISON SOFTWARE, INC.,

                           by    /s/ Donald H. Lee
                              ---------------------------------------
                              Name:    Donald H. Lee
                              Title:   President & Chief
                                       Executive Officer



<PAGE>


                                                                   EXHIBIT A
                                                     TO THE MERGER AGREEMENT

                            FORM OF AFFILIATE LETTER

Dear Sirs:

          The undersigned, a holder of shares of common stock, par value 
$.001 per share ("Company Common Stock"), of Unison Software, Inc., a 
Delaware corporation (the "Company"), acknowledges that the undersigned may 
be deemed an "affiliate" of the Company within the meaning of Rule 145 ("Rule 
145") promulgated under the Securities Act of 1933, as amended (the 
"Securities Act"), by the Securities and Exchange Commission (the "SEC"), 
although nothing contained herein should be construed as an admission of such 
fact.  Pursuant to the terms of the Agreement and Plan of Merger dated as of 
September 12, 1997, among International Business Machines Corporation, a New 
York corporation ("Parent"), New Orchard Corp., a Delaware corporation and a 
wholly owned subsidiary of Parent ("Sub"), and the Company, the Company will 
be merged with and into Sub (the "Merger"), and in connection with the 
Merger, the undersigned is entitled to receive common stock, par value $1.25 
per share ("Parent Common Stock"), of Parent.

          If in fact the undersigned were an affiliate under the Securities 
Act, the undersigned's ability to sell, assign or transfer the Parent Common 
Stock received by the undersigned in exchange for any shares of Company 
Common Stock in connection with the Merger may be restricted unless such 
transaction is registered under the Securities Act or an exemption from such 
registration is available.  The undersigned understands that such exemptions 
are limited and the undersigned has obtained or will obtain advice of counsel 
as to the nature and conditions of such exemptions, including information 
with respect to the applicability to the sale of such securities of Rules 144 
and 145(d) promulgated under the Securities Act.  The undersigned understands 
that Parent will not be required to maintain the effectiveness of any 
registration statement under the Securities Act for the purposes of resale of 
Parent Common Stock by the undersigned.

          The undersigned hereby represents to and covenants with Parent that
the undersigned will not sell, assign or transfer any of the Parent Common Stock
received by the undersigned in exchange for shares of Company Common Stock in
connection with the Merger except (i) pursuant to an effective registration
statement under the Securities Act, (ii) in conformity with the volume and other
limitations of Rule 145 or (iii) in a transaction which, in the opinion of the
general counsel of Parent or other counsel reasonably satisfactory to Parent (it
being expressly agreed that 


<PAGE>
                                                                          2




Wilson Sonsini Goodrich & Rosati shall be considered reasonably satisfactory 
for all purposes under this Agreement) or as described in a "no-action" or 
interpretive letter from the Staff of the SEC specifically issued with 
respect to a transaction to be engaged in by the undersigned, is not required 
to be registered under the Securities Act.

          In the event of a sale or other disposition by the undersigned of 
Parent Common Stock pursuant to Rule 145, the undersigned will supply Parent 
with evidence of compliance with such Rule, in the form of a letter in the 
form of Annex I hereto (or other reasonably satisfactory documentation 
evidencing compliance with Rule 145) and the opinion of counsel or no-action 
letter referred to above.  The undersigned understands that Parent may 
instruct its transfer agent to withhold the transfer of any Parent Common 
Stock disposed of by the undersigned, but that (provided such transfer is not 
prohibited by any other provision of this letter agreement) upon receipt of 
such evidence of compliance, Parent shall cause the transfer agent to 
effectuate the transfer of the Parent Common Stock sold as indicated in such 
letter.

          Parent covenants that it will take all such actions as may be 
reasonably available to it to permit the sale or other disposition of Parent 
Common Stock by the undersigned under Rule 145 in accordance with the terms 
thereof.

          The undersigned acknowledges and agrees that the legends set forth 
below will be placed on certificates representing Parent Common Stock 
received by the undersigned in connection with the Merger or held by a 
transferee thereof, which legends will be removed by delivery of substitute 
certificates upon receipt of an opinion in form and substance reasonably 
satisfactory to Parent from counsel reasonably satisfactory to Parent to the 
effect that such legends are no longer required for purposes of the 
Securities Act.

          There will be placed on the certificates for Parent Common Stock 
issued to the undersigned, or any substitutions therefor, a legend stating in 
substance:

          "The shares represented by this certificate were issued pursuant to
     transaction to which Rule 145 promulgated under the Securities Act of 1933
     applies.  The shares have not been acquired by the holder with a view to,
     or for resale in connection with, any distribution thereof within the
     meaning of the 


<PAGE>
                                                                          3



     Securities Act of 1933.  The shares may not be sold, pledged or otherwise 
     transferred except in accordance with an exemption from the registration 
     requirements of the Securities Act of 1933."

          The undersigned acknowledges that (i) the undersigned has carefully
read this letter and understands the requirements hereof and the limitations
imposed upon the distribution, sale, transfer or other disposition of Parent
Common Stock and (ii) the receipt by Parent of this letter is an inducement to
Parent's obligations to consummate the Merger.


                                          Very truly yours,



Dated:



<PAGE>

                                                                   ANNEX I
                                                              TO EXHIBIT A


[Name]                                                              [Date]


          On                    , the undersigned sold the securities of 
International Business Machines Corporation ("Parent") described below in the 
space provided for that purpose (the "Securities").  The Securities were 
received by the undersigned in connection with the merger of New Orchard 
Corp., a Delaware corporation, with and into Unison Software, Inc.

          Based upon the most recent report or statement filed by Parent with 
the Securities and Exchange Commission, the Securities sold by the 
undersigned were within the prescribed limitations set forth in paragraph (e) 
of Rule 144 promulgated under the Securities Act of 1933, as amended (the 
"Securities Act").

          The undersigned hereby represents that the Securities were sold in 
"brokers' transactions" within the meaning of Section 4(4) of the Securities 
Act or in transactions directly with a "market maker" as that term is defined 
in Section 3(a)(38) of the Securities Exchange Act of 1934, as amended.  The 
undersigned further represents that the undersigned has not solicited or 
arranged for the solicitation of orders to buy the Securities, and that the 
undersigned has not made any payment in connection with the offer or sale of 
the Securities to any person other than to the broker who executed the order 
in respect of such sale.

                              Very truly yours,





            [Space to be provided for description of the Securities.]




<PAGE>

                    STOCKHOLDER AGREEMENT dated as of September 12, 1997, among
               INTERNATIONAL BUSINESS MACHINES CORPORATION, a New York
               corporation ("Parent"), and the individuals and other parties
               listed on Schedule A attached hereto (each, a "Stockholder" and,
               collectively, the "Stockholders").


          WHEREAS, Parent, New Orchard Corp., a Delaware corporation and a
wholly owned subsidiary of Parent ("Sub"), and Unison Software, Inc., a Delaware
corporation (the "Company"), propose to enter into an Agreement and Plan of
Merger dated as of the date hereof (as the same may be amended or supplemented,
the "Merger Agreement"; capitalized terms used but not defined herein shall have
the meanings set forth in the Merger Agreement) providing for the merger of the
Company with and into Sub (the "Merger"), upon the terms and subject to the
conditions set forth in the Merger Agreement; and

          WHEREAS, as of the date hereof each Stockholder owns the number of
shares of common stock, par value $.001 per share, of the Company ("Company
Common Stock") set forth opposite his or its name on Schedule A attached hereto
(such shares of Company Common Stock, together with any other shares of capital
stock of the Company acquired by such Stockholder after the date hereof and
during the term of this Agreement (including through the exercise of any stock
options, warrants or similar instruments), being collectively referred to herein
as the "Subject Shares"); and

          WHEREAS, as a condition and inducement to its willingness to enter
into the Merger Agreement, Parent has requested that each Stockholder enter into
this Agreement;

          NOW, THEREFORE, to induce Parent to enter into, and in consideration
of its entering into, the Merger Agreement, and in consideration of the
representations, warranties, covenants and agreements contained in this
Agreement, the parties hereto agree as follows:

          1.  REPRESENTATIONS AND WARRANTIES OF EACH STOCKHOLDER.  Each
Stockholder hereby, severally and not jointly, represents and warrants to Parent
as of the date hereof in respect of himself or itself as follows:

          (a)  AUTHORITY.  The Stockholder has all requisite power and authority
to execute and deliver this Agreement and to consummate the transactions
contemplated hereby.  



<PAGE>
                                                                          2


This Agreement has been duly authorized, executed and delivered by the 
Stockholder and constitutes a valid and binding obligation of the Stockholder 
enforceable against the Stockholder in accordance with its terms.  The 
execution and delivery of this Agreement do not, and the consummation of the 
transactions contemplated by this Agreement and compliance with the 
provisions of this Agreement will not, (i) conflict with, or result in any 
violation of, or default (with or without notice or lapse of time, or both) 
under, any provision of any trust agreement, loan or credit agreement, bond, 
debenture, note, mortgage, indenture, lease or other contract, commitment, 
agreement, arrangement, obligation, undertaking, understanding, instrument, 
permit, concession, franchise, license, statute, law, ordinance, rule, 
regulation, judgment, order, notice or decree, applicable to the Stockholder 
or to the Stockholder's property or assets, (ii) require any registration, 
declaration or filing with, or consent, approval, order or authorization of, 
any Federal, state or local, domestic or foreign, government or any court, 
administrative agency or commission or other governmental or regulatory 
authority or agency, domestic or foreign or (iii) violate any judgment, 
order, writ, injunction, decree, statute, law, ordinance, rule or regulation 
applicable to the Stockholder or any of the Stockholder's properties or 
assets, including the Stockholder's Subject Shares.  If the Stockholder is a 
natural person and is married, and the Stockholder's Subject Shares 
constitute community property or otherwise need special or other approval for 
this Agreement to be legal, valid and binding, this Agreement has been duly 
authorized, executed and delivered by, and constitutes a valid and binding 
agreement of, the Stockholder's spouse or the person giving such approval, 
enforceable against such spouse or person in accordance with its terms.  No 
trust of which such Stockholder is a trustee requires the consent of any 
beneficiary to the execution and delivery of this Agreement or to the 
consummation of the transactions contemplated hereby.  The Stockholder, 
together with the other Stockholders, constitutes all the trustees of any 
trust of which such Stockholder is a trustee, and such trustees have all 
requisite power and authority to execute and deliver this Agreement and to 
consummate the transactions contemplated hereby on behalf of such trust.   

          (b)  THE SUBJECT SHARES.  The Stockholder is the  record and
beneficial owner of, or is trustee of a trust that is the record holder of, and
whose beneficiaries are the beneficial owners of, and has good and marketable
title to, the Subject Shares set forth opposite his or its name on Schedule A
attached hereto.  As of the date hereof, the Stockholder does not own, of record
or beneficially, any 



<PAGE>
                                                                          3



shares of capital stock of the Company other than the Subject Shares set 
forth opposite his or its name on Schedule A attached hereto.

          (c) ENCUMBRANCES.  The Stockholder's Subject Shares and the
certificates representing such Shares are now, and at all times during the term
hereof will be, held by such Stockholder, or by a nominee or custodian for the
benefit of such Stockholder, free and clear of all pledges, claims, liens,
security interests, proxies, voting trusts or agreements, arrangements or
understandings or any other encumbrances whatsoever, except for any such
encumbrances or proxies arising hereunder or under the existing terms of a trust
of which such Stockholder is the trustee.

          2.  REPRESENTATIONS AND WARRANTIES OF PARENT.  Parent hereby
represents and warrants to each Stockholder that Parent has all requisite
corporate power and authority to execute and deliver this Agreement and to
consummate the transactions contemplated hereby.  This Agreement has been duly
authorized, executed and delivered by Parent and constitutes a valid and binding
obligation of Parent enforceable against Parent in accordance with its terms. 
The execution and delivery of this Agreement do not, and the consummation of the
transactions contemplated by this Agreement and compliance with the provisions
of this Agreement will not, conflict with, or result in any violation of, or
default (with or without notice or lapse of time or both) under, any provision
of the Certificate of Incorporation or By-laws of Parent, any trust agreement,
loan or credit agreement, bond, debenture, note, mortgage, indenture, lease or
other contract, commitment, agreement, arrangement, obligation, understanding,
instrument, permit, concession, franchise, license, statute, law, ordinance,
rule, regulation, judgment, order, notice or decree applicable to Parent or to
Parent's property or assets.

          3.  COVENANTS OF EACH STOCKHOLDER.  Until the termination of this
Agreement in accordance with Section 8, each Stockholder, severally and not
jointly, agrees as follows:

          (a)  Without in any way limiting the Stockholder's right to vote the
Subject Shares in its sole discretion on any other matters that may be submitted
to a stockholder vote, consent or other approval (including by written consent),
at any meeting of stockholders of the Company called to vote upon the Merger and
the Merger Agreement or at any adjournment thereof or in any other circumstances
upon which a vote, consent or other approval (including by written consent) with
respect to the Merger and the Merger 



<PAGE>
                                                                          4



Agreement is sought, the Stockholder shall, including by initiating a written 
consent solicitation if requested by Parent, vote (or cause to be voted) such 
Stockholder's Subject Shares (and each class thereof) in favor of the Merger, 
the adoption by the Company of the Merger Agreement and the approval of the 
other transactions contemplated by the Merger Agreement.

          (b)  At any meeting of stockholders of the Company or at any
adjournment thereof or in any other circumstances upon which the Stockholder's
vote, consent or other approval is sought, such Stockholder shall vote (or cause
to be voted) such Stockholder's Subject Shares against (i) any merger agreement
or merger (other than the Merger Agreement and the Merger), consolidation,
combination, sale of substantial assets, reorganization, recapitalization,
dissolution, liquidation or winding up of or by the Company or any other Company
Acquisition (collectively, "Alternative Transactions") or (ii) any amendment of
the Company's Certificate of Incorporation or Bylaws or other proposal or
transaction involving the Company or any of its subsidiaries, which amendment or
other proposal or transaction would in any manner impede, frustrate, prevent or
nullify the Merger, the Merger Agreement or any of the other transactions
contemplated by the Merger Agreement (collectively, "Frustrating Transactions").

          (c) Such Stockholder shall not (i) transfer (which term shall include,
without limitation, for the purposes of this Agreement, any sale, gift, pledge
or other disposition), or consent to any transfer of, any or all of such
Stockholder's Subject Shares or any interest therein, except pursuant to the
Merger, (ii) enter into any contract, option or other agreement, arrangement or
understanding with respect to any or all of such Subject Shares or any interest
therein, (iii) grant any proxy, power-of-attorney or other authorization in or
with respect to such Subject Shares, except for this Agreement or (iv) deposit
such Shares into a voting trust or enter into a voting agreement or arrangement
with respect to such Shares; PROVIDED, HOWEVER, that any such Stockholder may
transfer (as defined above) any of the Subject Shares to any other Stockholder
who is on the date hereof, or to any family member of a Stockholder or
beneficiary of a trust for which Stockholder is trustee or charitable
institution which prior to the Stockholders Meeting and prior to such transfer
becomes, a party to this Agreement bound by all the obligations of a
"Stockholder" hereunder. 

          (d) Such Stockholder hereby waives any rights of appraisal, or rights
to dissent from the Merger, that such 5



<PAGE>
                                                                          5



Stockholder may have and hereby irrevocably agrees to make a Stock Election with
respect to at least 85% of such Stockholder's Subject Shares.  

          (e) During the term of this Agreement, the Stockholder shall not, nor
shall it authorize or permit any officer, director, partner, employee or agent
or any investment banker, attorney or other advisor or representative of the
Stockholder to, directly or indirectly, (i) solicit, initiate or encourage the
submission of any Takeover Proposal or (ii) participate in any discussions or
negotiations regarding, or furnish to any person any information with respect
to, or take any other action to facilitate any inquiries or the making of any
proposal that constitutes or may reasonably be expected to lead to, any Takeover
Proposal.  The foregoing sentence shall not prohibit the Stockholder from taking
any action that would be permitted under Section 4.02 of the Merger Agreement
and in no event shall the Stockholder be liable for any action taken by the
Company or the Stockholder in compliance with, or that would be permitted under,
Section 4.02 of the Merger Agreement; PROVIDED, HOWEVER that this sentence shall
not limit the obligations of the Stockholder under Sections 3(a), 3(b) and 3(j)
and 4 hereof.

          (f) Until after the Merger is consummated or the Merger Agreement is
terminated, the Stockholder shall use all reasonable efforts to take, or cause
to be taken, all actions, and to do, or cause to be done, and to assist and
cooperate with the other parties in doing, all things necessary, proper or
advisable to consummate and make effective, in the most expeditions manner
practicable, the Merger and the other transactions contemplated by the Merger
Agreement.  The foregoing sentence shall not prohibit the Stockholder from
taking any action that would be permitted under Section 4.02 of the Merger
Agreement and in no event shall the Stockholder be liable for any action taken
by the Company or the Stockholder in compliance with, or that would be permitted
under, Section 4.02 of the Merger Agreement; PROVIDED, HOWEVER that this
sentence shall not limit the obligations of the Stockholder under Sections 3(a),
3(b) and 3(j) and 4 hereof.

          (g)  If, at the time the Merger Agreement is submitted for approval to
the stockholders of the Company, a Stockholder is an "affiliate" of the Company
for purposes of Rule 145 under the Securities Act, such Stockholder shall
deliver to Parent on or prior to the Closing Date a written agreement
substantially in the form attached as Exhibit A to the Merger Agreement.


<PAGE>
                                                                          6



          (h)  The Stockholder, and any beneficiary of a revocable trust for
which such Stockholder serves as trustee, shall not take any action to revoke,
terminate or amend such trust or take any other action which would restrict,
limit or frustrate in any way the transactions contemplated by this Agreement,
including withdrawing any Subject Shares from such trust or replacing any
trustees of such trust.  The Stockholder, on behalf of each such beneficiary,
hereby acknowledges and agrees to be bound by the terms of this Agreement
applicable to it.

          (i)  Each Stockholder shall cause this Agreement to be filed with the
Secretary of the Company.

          (j) (i) In the event that the Merger Agreement shall have been
terminated under circumstances where Parent is or may become entitled to receive
the Termination Fee, each Stockholder shall pay to Parent on demand an amount
equal to all profit (determined in accordance with Section 3(j)(ii)) of such
Stockholder from the consummation of (A) any Company Acquisition consummated
within 12 months following the termination of the Merger Agreement pursuant to
Section 7.01(b)(iv) thereof or (B) any Company Acquisition that results in the
Company being obligated to pay the Termination Fee in accordance with the Merger
Agreement.

          (ii) For purposes of this Section 3(j), the profit of any Stockholder
from any Company Acquisition shall equal (A) the aggregate consideration
received by such Stockholder pursuant to such Company Acquisition, valuing any
non-cash consideration (including any residual interest in the Company) at its
fair market value on the date of such consummation plus (B) the fair market
value, on the date of disposition, of all Subject Shares of such Stockholder
disposed of after the termination of the Merger Agreement and prior to the date
of such consummation less (C) the fair market value of the aggregate
consideration that would have been issuable or payable to such Stockholder if
such Stockholder had received the Merger Consideration set forth in the Merger
Agreement in effect on the date hereof (the "Original Merger Consideration"),
valued as of the close of business on the last full trading day prior to the
first public announcement by the Company of its intention to terminate the
Merger Agreement as if the Merger had been consummated on the date of such
public announcement.  In addition, it is agreed that for purposes of this
Section 3(j), the profit of any Stockholder from any Company Acquisition shall
be net of any taxes paid or payable by Stockholder in respect of or otherwise
attributable to such profit (after taking into account the present value of any


<PAGE>
                                                                          7



tax benefits in respect of or otherwise attributable to any payment of such
profit pursuant to Section 3(j)(i)); it being understood that any such
Stockholder shall deliver to Parent a written opinion of a nationally recognized
accounting firm as to the amount of any such net tax adjustments at the time of
the payment of any profits pursuant to Section 3(j)(i).

          (iii) For purposes of this Section 3(j), the fair market value of any
non-cash consideration consisting of:

          (A)  securities listed on a national securities exchange or traded on
               the Nasdaq Stock Market shall be equal to the average closing
               price per share of such security as reported on such exchange or
               Nasdaq Stock Market for the five trading days before the date of
               determination; and

          (B)  consideration that is other than cash or securities of the form
               specified in clause (A) of this Section 3(j)(iii) shall be
               determined by a nationally recognized independent investment
               banking firm mutually agreed upon by Parent and the Stockholders
               within 10 business days of the event requiring selection of such
               banking firm; PROVIDED, HOWEVER, that if Parent and the
               Stockholders are unable to agree within two business days after
               the date of such event as to the investment banking firm, then
               Parent and the Stockholders shall each select one firm, and those
               firms shall select a third investment banking firm, which third
               firm shall make such determination; PROVIDED FURTHER, that the
               fees and expenses of such investment banking firm shall be borne
               equally by Parent, on the one hand, and the Stockholders, on the
               other hand.  The determination of the investment banking firm
               shall be binding upon the parties.

          (iv) Any payment of profit under this Section 3(j) shall be paid in
the same form as the consideration received from the Company Acquisition or
disposition (and, if the consideration received from the Company Acquisition or
disposition was received in more than one form, in the same proportion as the
forms of consideration received) and (x) to the extent paid in cash, shall be
paid by wire transfer of same day funds to an account designated by Parent and
(y) to the extent paid through a transfer of 


<PAGE>
                                                                          8



securities, shall be paid through delivery of such securities, suitably 
endorsed for transfer.

          4.   GRANT OF IRREVOCABLE PROXY; APPOINTMENT OF PROXY.  (a)  Without
in any way limiting the Stockholder's right to vote the Subject Shares in its
sole discretion on any other matters that may be submitted to a stockholder
vote, consent or other approval (including by written consent), each Stockholder
hereby irrevocably grants to, and appoints, Parent and Lee Dayton and Archie
Colburn, in their respective capacities as designees of Parent, and any
individual who shall hereafter succeed to any such office of Parent, and each of
them individually, such Stockholder's proxy and attorney-in-fact (with full
power of substitution), for and in the name, place and stead of such
Stockholder, to vote such Stockholder's Subject Shares, or grant a consent or
approval in respect of such Subject Shares, (i) in favor of the Merger, the
adoption by the Company of the Merger Agreement and the approval of the other
transactions contemplated by the Merger Agreement, and (ii) against any
Alternative Transaction or Frustrating Transaction.  The proxy set forth in this
Section 4 shall terminate upon the termination of this Agreement.

          (b)  Such Stockholder represents that any proxies heretofore given in
respect of such Stockholder's Subject Shares are not irrevocable, and that all
such proxies are hereby revoked.

          (c)  Such Stockholder hereby affirms that the irrevocable proxy set
forth in this Section 4 is given in connection with the execution of the Merger
Agreement, and that such irrevocable proxy is given to secure the performance of
the duties of the Stockholder under this Agreement.  Such Stockholder hereby
further affirms that the irrevocable proxy is coupled with an interest and may
under no circumstances be revoked.  Such Stockholder hereby ratifies and
confirms all that such irrevocable proxy may lawfully do or cause to be done by
virtue hereof.  Such irrevocable proxy is executed and intended to be
irrevocable in accordance with the provisions of Section 212(e) of the DGCL.

          5.  FURTHER ASSURANCES.  Each Stockholder will, from time to time,
execute and deliver, or cause to be executed and delivered, such additional or
further consents, documents and other instruments and take such other actions as
Parent may reasonably request for the purposes of effectively carrying out the
transactions contemplated by this Agreement.



<PAGE>
                                                                          9



          6.   CERTAIN EVENTS.  (a)  Each Stockholder agrees that this Agreement
and the obligations hereunder shall attach to such Stockholder's Subject Shares
and shall be binding upon any person or entity to which legal or beneficial
ownership of such Subject Shares shall pass, whether by operation of law or
otherwise, including such Stockholder's heirs, guardians, administrators or
successors.  In the event of any stock split, stock dividend, merger,
reorganization, recapitalization or other change in the capital structure of the
Company affecting the Company Common Stock, or the acquisition of additional
shares of Company Common Stock or other voting securities of the Company by any
Stockholder, the number of Subject Shares listed in Schedule A beside the name
of such Stockholder shall be adjusted appropriately and this Agreement and the
obligations hereunder shall attach to any additional shares of Company Common
Stock or other voting securities of the Company issued to or acquired by such
Stockholder.

          (b)  Each Stockholder agrees that such Stockholder will tender to the
Company, within 10 business days after the date hereof (or, in the event Subject
Shares are acquired subsequent to the date hereof within 10 business days after
the date of such acquisition), any and all certificates representing such
Stockholder's Subject Shares in order that the Company may inscribe upon such
certificates the legend in accordance with Section 5.12 of the Merger Agreement.

          7.  ASSIGNMENT.  Neither this Agreement nor any of the rights,
interests or obligations hereunder shall be assigned, in whole or in part, by
operation of law or otherwise, by any Stockholder, on the one hand, without the
prior written consent of Parent nor by Parent, on the other hand, without the
prior written consent of the Stockholders, except that Parent may assign, in its
sole discretion, any or all of its rights, interests and obligations hereunder
to any direct or indirect wholly owned subsidiary of Parent.  Subject to the
preceding sentence, this Agreement will be binding upon, inure to the benefit of
and be enforceable by the parties and their respective successors and assigns.

          8.  TERMINATION.  This Agreement shall terminate, and the provisions
hereof shall be of no further force or effect, upon the earliest to occur of
(v) March 15, 1999, (w) the Effective Time, (x) the termination of the Merger
Agreement pursuant to Section 7.01(a), Section 7.01(b)(ii) or Section 7.01(d),
(y) the termination of the Merger Agreement pursuant to Section 7.01(b)(i) or
Section 7.01(b)(iii) unless in either case a Takeover Proposal shall have been
publicly announced or otherwise publicly disclosed 


<PAGE>
                                                                          10



and not publicly withdrawn prior to such termination or (z) one year after 
the date the Merger Agreement is otherwise terminated in accordance with its 
terms.  Notwithstanding the foregoing, Section 3(j) and the last sentence of 
Section 4(a) shall survive the termination of this Agreement.

          9.  GENERAL PROVISIONS.

          (a)  AMENDMENTS.  This Agreement may not be amended except by an
instrument in writing signed by each of the parties hereto.

          (b)  NOTICE.  All notices, requests, claims, demands and other
communications hereunder shall be in writing and shall be deemed given if
delivered personally or sent by overnight courier (providing proof of delivery)
to Parent in accordance with Section 8.02 of the Merger Agreement and to the
Stockholders at their respective addresses set forth on Schedule A attached
hereto (or at such other address for a party as shall be specified by like
notice).

          (c)  INTERPRETATION.  When a reference is made in this Agreement to a
Section or Schedule, such reference shall be to a Section of or Schedule to this
Agreement unless otherwise indicated.  The headings contained in this Agreement
are for reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement.  Wherever the words "include", "includes" or
"including" are used in this Agreement, they shall be deemed to be followed by
the words "without limitation".

          (d)  COUNTERPARTS.  This Agreement may be executed in one or more
counterparts, all of which shall be considered one and the same agreement, and
shall become effective when one or more of the counterparts have been signed by
each of the parties and delivered to the other parties.

          (e)  ENTIRE AGREEMENT; NO THIRD-PARTY BENEFICIARIES.  This Agreement
(including the documents and instruments referred to herein) (i) constitutes the
entire agreement, and supersedes all prior agreements and understandings, both
written and oral, among the parties with respect to the subject matter hereof
and (ii) is not intended to confer upon any person other than the parties hereto
any rights or remedies hereunder.

          (f)  GOVERNING LAW.  This Agreement shall be governed by, and
construed in accordance with, the laws of 


<PAGE>
                                                                         11



the State of Delaware, regardless of the laws that might otherwise govern 
under applicable principles of conflicts of law thereof.

          (g)  VOIDABILITY.  If prior to the execution hereof, the Board of
Directors of the Company shall not have duly and validly authorized and approved
by all necessary corporate action, this Agreement, the Merger Agreement and the
transactions contemplated hereby and thereby, so that by the execution and
delivery hereof Parent or Sub would become, or could reasonably be expected to
become, an "interested stockholder" with whom the Company would be prevented for
any period pursuant to Section 203 of the DGCL from engaging in any "business
combination" (as such terms are defined in Section 203 of the DGCL), then this
Agreement shall be void and unenforceable until such time as such authorization
and approval shall have been duly and validly obtained.

          10.  ENFORCEMENT.  The parties agree that irreparable damage would
occur in the event that any of the provisions of this Agreement were not
performed in accordance with their specific terms or were otherwise breached. 
It is accordingly agreed that the parties shall be entitled to an injunction or
injunctions to prevent breaches of this Agreement and to enforce specifically
the terms and provisions of this Agreement in any court of the United States
located in the State of Delaware or in a Delaware state court, this being in
addition to any other remedy to which they are entitled at law or in equity.  In
addition, each of the parties hereto (i) consents to submit itself to the
personal jurisdiction of any court of the United States located in the State of
Delaware or any Delaware state court in the event any dispute arises out of this
Agreement or any of the transactions contemplated by this Agreement, (ii) agrees
that it will not attempt to deny or defeat such personal jurisdiction by motion
or other request for leave from any such court, (iii) agrees that such party
will not bring any action relating to this Agreement or the transactions
contemplated by this Agreement in any court other than a court of the United
States located in the State of Delaware or a Delaware state court and
(iv) waives any right to trial by jury with respect to any claim or proceeding
related to or arising out of this Agreement or any of the transactions
contemplated hereby.

          11.  PUBLIC ANNOUNCEMENTS.  Except as required by law, no Stockholder
shall issue any press release or other public statement with respect to the
transactions 



<PAGE>
                                                                          12



contemplated by this Agreement or the Merger Agreement without the prior 
written consent of Parent.

          12.  SEVERABILITY.  If any term or other provision of this Agreement
is invalid, illegal or incapable of being enforced by any rule of law or public
policy, all other conditions and provisions of this Agreement shall nevertheless
remain in full force and effect.  Upon such determination that any term or other
provision is invalid, illegal or incapable of being enforced, the parties hereto
shall negotiate in good faith to modify this Agreement so as to effect the
original intent of the parties as closely as possible to the fullest extent
permitted by applicable law 



<PAGE>
                                                                          13



in an acceptable manner to the end that the transactions contemplated hereby are
fulfilled to the extent possible.


          IN WITNESS WHEREOF, Parent has caused this Agreement to be signed by
its authorized signatories and each Stockholder has signed this Agreement, all
as of the date first written above.


                                    INTERNATIONAL BUSINESS MACHINES 
                                    CORPORATION,



                                    By: /s/ Lee A. Dayton
                                        ------------------------------------
                                        Name:    Lee A. Dayton
                                        Title:   Vice President
                                                 Corporate Development &
                                                 Real Estate

                                        STOCKHOLDERS:

                                           /s/ Don H. Lee
                                        ------------------------------------
                                                      Don H. Lee

                                           /s/ Michael A. Casteel
                                        ------------------------------------
                                                  Michael A. Casteel



<PAGE>


                                   SCHEDULE A

                                                        Number of Shares 
                                                           of Company     
 Name and                                                 Common Stock    
Address of                                               Owned or to be   
Stockholder*                                             Owned of Record  
- ------------                                             ---------------

Don H. Lee(1)                                              2,240,952

Michael A. Casteel(2)                                      1,482,649


- ----------------------
  *  Unless an address is otherwise set forth below, the address for such 
stockholder shall be the address of the Company set forth in Section 8.02 of 
the Merger Agreement.
 
 (1) Includes 12,000 shares issuable under stock options exercisable within 
60 days of August 29, 1997.

 (2)  Includes 18,000 shares issuable under stock options exercisable within 
60 days of August 29, 1997. 


<PAGE>

FOR IMMEDIATE RELEASE


Company Contact:                                  Financial Relations Board:
Richard Armitage                                  Lynne Farris (General Info.)
Chief Financial Officer                           Jordan Goldstein (Analysts)
(408) 988-2800                                    (415) 986-1591

            UNISON SOFTWARE REPORTS FISCAL 1998 FIRST QUARTER REVENUES AND
                      ANNOUNCES PROPOSED MERGER WITH IBM/TIVOLI

Santa Clara, CA (September 15, 1997) - Unison Software, Inc. (Nasdaq NM: 
UNSN), a leading developer of networked systems management tools, today 
announced increased revenues for the fiscal 1998 first quarter ended August 
31, 1997.  For the quarter, revenues grew 36 percent to $10.3 million from 
$7.6 million for the same period last year.  The company reported net income 
of $768,000, or $0.06 per share, compared with net income of $763,000, or 
$0.06 per share, for the same period last year.  Per share results have been 
adjusted retroactively to reflect the three-for-two stock split effective on 
January 31, 1997.

Additionally, the company announced it has signed a definitive agreement to 
merge with Tivoli Systems, a subsidiary of IBM (NYSE:IBM).  Under the terms 
of the agreement, each share of Unison Software common stock will be 
converted in the merger into the right to receive $15 in cash or IBM common 
stock, at the shareholder's election.  Shareholders may elect to receive up 
to approximately one-half of the total value of the transaction in cash.   
The transaction is subject to Unison shareholder approval and other standard 
conditions to closing.



<PAGE>

Unison Software Reports Increased Revenue
for Fiscal 1998 First Quarter
September 15, 1997
p.2


Don H. Lee, chief executive officer, stated, "Unison is currently positioned 
as an industry-leading developer of workload management software tools, and 
our suite of products are providing cost-effective solutions to networked 
systems environments.  The success of out product line, together with the 
innovative and entrepreneurial nature of our development and sales teams, 
have also positioned us as an attractive complement to one of our most 
important strategic partners, Tivoli Systems, Inc., an IBM Company.  By 
combining our strengths and resources, we will be able to take advantage of 
the industry momentum that is driving the growth of our two companies.

"Today, we face an increasingly complex competitive landscape," continued Mr. 
Lee.  "We believe that merging with a key market leader will bolster our 
ability to expand our market opportunities and accelerate our growth.  A 
merger with IBM/Tivoli will strengthen our ability to recruit high-caliber 
employees, provide the marketing muscle we need to distribute our products 
worldwide, leverage our investment in R&D activities, and enhance our overall 
effectiveness in the marketplace."

"We believe that this merger is a natural evolution of our strategic 
partnership with IBM/Tivoli and will benefit our customers, employees, and 
shareholders," concluded Mr. Lee.

Unison Software, Inc. is a leading developer of networked systems management 
software for large, complex, geographically dispersed computing environments. 
The company's suite of workload, 



<PAGE>

Unison Software Reports Increased Revenue
for Fiscal 1998 First Quarter
September 15, 1997
p.3


storage and output management tools enable customers to manage and automate 
workload scheduling and distribution, high-speed backup, and print production 
in client/server environments.  By providing coordinated distributed 
processes and expedient delivery of business-critical information, Unison's 
products are designed to enable customers to improve efficiency and reduce 
operating costs.  For more information, please visit the company's World Wide 
Website at http://www.unison.com.

The statements made in this release that are not historical facts contain 
forward-looking information that may involve risks and uncertainties within 
the meaning of Section 27A of the Securities Act of 1993 and Section 21E of 
the Securities Exchange Act of 1994.  Important factors that may cause actual 
results to differ include, but are not limited to, the company's ability to 
deliver products that meet the needs of its targeted markets, especially UNIX 
and Windows NT, the effectiveness of the company's relationship with its 
partners, the impact of competitive products and services, the effect of 
economic conditions or technological changes in target markets, the ability 
of the company to expand its field sales force and indirect distribution 
channels, risks inherent in international operations and other risks detailed 
from time to time in the company's filings with the Securities and Exchange 
Commission.

                            [financial tables follow]


<PAGE>
                              UNISON SOFTWARE, INC.
                      Consolidated Statement of Operations
                      (In thousands, except per share data)
                                   (Unaudited)

                                              First Quarter Ended
                                        August 31, 1997     August 31, 1996
                                        ---------------     ---------------
Net Revenues:

     License fees                            $6,032              $4,546  

     Services                                 4,308               3,033
                                        ---------------     ---------------
     Total Net Revenue                       10,340               7,579

Costs and Expenses:     

     Cost of License Fees                      277                  195

     Cost of services                        1,043                  699

     Sales and marketing                     5,149                3,783

     Research and development                1,720                1,092

     General and administrative              1,186                  801
                                        ---------------     ---------------

          Total Costs and Expenses           9,375                6,570
                                        ---------------     ---------------

Income from operations                         965                1,009

Interest and other income (expense)            284                  232
                                        ---------------     ---------------

Income before net taxes                      1,249                1,241

Provision for income taxes                     481                  478
                                        ---------------     ---------------

Net income                                    $768                 $763
                                        ---------------     ---------------
                                        ---------------     ---------------

Net income per share                         $0.06                $0.06

Shares used in per share calculation        12,121               12,158


Note:  The number of shares used in the per share calculation have been 
adjusted retroactively to give effect to a three-for-two stock split 
effective January 31, 1997.




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