ON TECHNOLOGY CORP
8-K, 1997-02-06
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)            January 28, 1997
                                                         -----------------------




ON Technology Corporation
- --------------------------------------------------------------------------------


Delaware                                0-26376                 04-3162846
- --------------------------------------------------------------------------------
(State or other jurisdiction          (Commission            (IRS Employer
of incorporation)                     File Number)          Identification No.)
 

One Cambridge Center                 Cambridge, MA                    02142 
- --------------------------------------------------------------------------------
(Address of principal executive offices)                            (Zip Code)



Registrant's telephone number, including area code   (617) 374-1400
                                                   ---------------------------- 



                                   N/A
- --------------------------------------------------------------------------------
         (Former name or former address, if changed since last report.)
<PAGE>
 
                           ON TECHNOLOGY CORPORATION


Item 2  Acquisition or Disposition of Assets

     On January 28, 1997, Wilma 96 Vermogensverwaltungs GmbH ("Wilma GmbH"), a
wholly-owned subsidiary of ON Technology Corporation ("ON Technology"), entered
into a definitive Stock Purchase Agreement (the "Purchase Agreement") with Hans-
Till Freiherr von Ruxleben, Liliane Freifrau von Ruxleben, Eugen Heiter, Iska
Heiter, Harald Moller, Reinhold Weber and Jochen Tschunke (the "Sellers") and
csd Software GmbH, a German corporation ("csd"), pursuant to which Wilma GmbH
purchased all of the outstanding capital stock of csd. The purchase price
consisted of: (i) $5,000,000 in cash and (ii) approximately 1,315,790 newly
issued shares, subject to certain post-closing adjustments, of ON Technology
common stock with a value of $7,393,160 based on the average closing price of ON
Technology Common Stock during the five business days preceding and the five
business days following the date of execution of the definitive Purchase
Agreement.

     csd is engaged in the development, manufacture and sale of PC desktop
software management tools.  csd has its products running on networks as small as
100 nodes and as large as 50,000 nodes.  csd's INTEGRA product family provides
an integrated set of management tools that allows organizations to upgrade or
install software applications, manage configurations, and do remote control on
networked PCs running DOS, Windows, Windows 95 or Windows NT.  Integra supports
network servers running Unix, NetWare, or Windows NT, and networks running IP or
IPX protocols.  INTEGRA differentiates itself from other software management
products by making it possible for the network administrator to upgrade the
entire operating system on a PC.  csd's principal asset consists of technology
related to its software products.

     The consideration payable by ON Technology in connection with its
acquisition was determined by arm's length negotiations among ON Technology, the
Sellers and csd.  Funds for the cash portion of the purchase price were provided
from ON Technology's available cash deposits.  None of the Sellers has a
material relationship with ON Technology, any affiliate of ON Technology, any
director or officer of ON Technology, or any associate of any such director or
officer.

Item 7  Financial Statements and Exhibits

     (a) Financial Statements of Business Acquired

     It is impractible at this time for ON Technology to include the financial
     statements of the acquired business required pursuant to this Item in this
     Current Report on Form 8-K.  Such financial statements will be filed by
     amendment to ON Technology's Current Report on Form 8-K as soon as they are
     available, and within 60 days, pursuant to Item 7(a)(4).

     (b) Pro Forma Financial Information

     It is impractible at this time for ON Technology to include the proforma
     financial information required pursuant to this Item in this Current Report
     on Form 8-K.  ON Technology is currently preparing the proforma financial
     information required pursuant to this Item and such proforma financial
     information will be filed by amendment to ON Technology's Current Report on
     Form 8-K as soon as it is available, and within 60 days, pursuant to Item
     7(b)(2).


     (c) Stock Purchase Agreement among Wilma 96 Vermogensverwaltungs GmbH, csd
     Software GmbH, Hans-Till Freiherr von Ruxleben, Liliane Freifrau von
     Ruxleben, Eugen Heiter, Iska Heiter, Harald Moller, Reinhold Weber and
     Jochen Tschunke dated January 28, 1997.
<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 thereunto duly authorized.

                              ON TECHNOLOGY CORPORATION


                                By: /s/ Christopher A. Risley
                                    _________________________________
                                    Christopher A. Risley
                                    President and Chief Executive Officer


Date:  February 5, 1997
<PAGE>
 
                                 EXHIBIT INDEX


(a)  Stock Purchase Agreement among Wilma 96 Vermogensverwaltungs GmbH and csd
     Software GmbH, dated January 28, 1997

<PAGE>
 
================================================================================
                                                                  EXECUTION COPY
 
 
 
 
 
 
 
 
 
 
 
 
                           STOCK PURCHASE AGREEMENT
 
                                 BY AND AMONG
 
                      WILMA 96 VERMOGENSVERWALTUNGS GMBH
 
                                    AND THE
 
                       SHAREHOLDERS OF CSD SOFTWARE GMBH
 
                                  DATED AS OF
 
                               JANUARY 28, 1997
 
 
 
 
 
 
 
 
 
 
================================================================================
<PAGE>
 
                               TABLE OF CONTENTS
<TABLE> 
<S>                                                                                                     <C> 
1.   Recitals.........................................................................................     3
                                                                                                       
2.   Sale and Purchase................................................................................     4
                                                                                                       
3.   Assignment and Individual Sellers' Representations...............................................     7
                                                                                                       
4.   Representations and Warranties...................................................................     8
                                                                                                       
5.   General Provisions Concerning Representations and Warranties.....................................    23

6.   Indemnification..................................................................................    23
     
7.   Representations and Warranties of Acquirer.......................................................    28
     
8.   Complete Performance, Period after Closing.......................................................    30
     
9.   Best Efforts to Obtain Satisfaction of Conditions................................................    31

10.  Fulfilled Conditions to Obligations of the Acquirer..............................................    31
     
11.  Fulfilled Conditions to Obligations of the Sellers...............................................    33
     
12.  Dispute Resolution...............................................................................    34
     
13.  Confidentiality..................................................................................    36
     
14.  Non-Competition..................................................................................    37
     
15.  Miscellaneous....................................................................................    38
</TABLE>
<PAGE>

PURCHASE AGREEMENT                                                       
- --------------------------------------------------------------------------------

Document Register No.
- ---------------------



On this day, this twenty-eighth day of January, nineteen hundred ninety-seven

                                                            - 28 January, 1997 -


appeared before me,


                                Dr. Dieter Mayer


Notary in Munich


in my office at 80333 Munich, Pacellistrasse 14:

1.1  Hans Till Freiherr von Ruxleben,
     geb. am 23.07.1958,
     Meckenrosenstrasse 5, 82031 Grunwald,,
     nach Angabe im gesetzlichen Guterstand lebend,
     - hereinafter: "Mr. von Ruxleben"

     (a)  acting on his one name

     (b)  acting on behalf of
          Herrn Reinhold Weber,
          geb. am 03.05.1951,
          Muffatstrasse 13, 82031 Gruwald,
          nach Angabe im gesetzlichen Guterstand verheiratet,
          - hereinafter: "Mr. Weber" -;

     (c)  acting on behalf of
          Herrn Prof. Jochen Tschunke,
          geb. am 24.02.1945,
          Rehbergstr. 6, 81479 Munchen,
          nach Angabe im Guterstand der Gutertrennung verheiratet,
          hereinafter: "Prof. Tschunke" -,
<PAGE>
 


PURCHASE AGREEMENT                                                   PAGE 2

     on the basis of written powers of attorney the originals of which are
attached to this deed as exhibit 1;

1.2  Liliane Freifrau von Ruxleben, geborene Aussum,
     geb. am 15.10.1964,
     Heckenrosenstrasse 5, 82031 Gruwald,
     nach Angabe im gesetzlichen Guterstand verheiratet,
     - hereinafter: "Mrs. von Ruxleben" -;

1.3  Herr Eugen Heiter,
     geb am 01.08.1952,
     Gautinger Strasse 29, 82131 Stockdorf,
     nach Angabe im Guterstand der Gutertrennung verheiratet,
     - hereinafter: "Mr. Heiter" -

     acting in his own name and on behalf of his wife

     Frau Iska Heiter, geborene Lauffs,
     geb. am 10.06.1955,
     Gautinger Strasse 29, 82131 Stockdorf,
     - hereinafter: "Mrs. Heiter" -,

     on the basis of an written power of attorney the original of which is
attached to this deed as exhibit 2;

1.4  Herr Harald Moller,
     geb. am 28.04.1971,
     Prebburger Strasse 33, 81377 Munchen,
     nach Angabe ledig,
     - hereinafter: "Mr. Moller" -;

     Messrs. Freiherr von Ruxleben, Heiter, Moller, Weber, Prof. Tschunke and
Mmes. Heiter and von Ruxleben hereinafter collectively referred to as

                                 "the Sellers".

     Mr. von Ruxleben and Mr. Heiter are also acting on behalf of

                               csd Software GmbH
                     - hereinafter referred to as "csd" -,

     having its registered corporate seat in Munich, HR B 84771, in their
capacity as managing directors of this company.

2.1  Mr. Christopher Hugget,
     business man,
     No 1 The old vicarage, Kingston Road, Teddington,
     Middlesex, TW 119HX, Great Britain,
<PAGE>
 
PURCHASE AGREEMENT                                                   PAGE 3


     not acting in his own name but acting on behalf of

     (d) Wilma 96 Vermogensverwaltungs GmbH

          having its seat in Munich, HR B 115 104, in his capacity as Managing
          director of this company.

          The notary hereby confirms that a shareholders resolution dated on
          24th January 1997 appointing Mr. Hugget as managing director with a
          sole power of representation of Wilma 96 Vermogensverwaltungs GmbH has
          been passed

          - hereinafter: "Acquirer" -;

     (e)  ON Technology Corporation,
          One Cambridge Center
          Cambridge, MA 02142
          a Delaware Corporation

          on the basis of a written power of attorney
          - a copy is attached to this deed as exhibit 3 -;
          with the obligation to deliver the original immediately.

Sellers and Acquirer hereinafter collectively referred to as

                                 "the Parties".

The persons appeared before me identified themselves by presenting their
official identity cards.

According to their request I record their statements as follows:
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 4


1.   RECITALS

1.1  Sellers are the sole shareholders of csd Software GmbH (hereinafter
     referred to as "csd"), having its registered corporate seat in Germany,
     registered in the Commercial Register of the Local Court, Munich, HRB
     84771.  The nominal share capital of csd amounts to DM 50,000 and is
     divided into the following shares, which are held as follows:

     Shareholder                    Nominal Value in DM
     -----------                    -------------------

     Mr. Heiter                     one share of
                                    DM 10,000

     Mrs. Heiter                    one share of
                                    DM 10,000

     Mr. von Ruxleben               one share of
                                    DM 4,500

     Mrs. von Ruxleben              one share of
                                    DM 10,000

     Mr. Moller (not married)       one share of
                                    DM 5,500
                                    and one share
                                    of DM 4,500

     Mr. Weber                      one share of
                                    DM 500

     Prof. Tschunke                 one share of
     (living under marital property DM 5,000
     regime of separation of goods)

     __________________________________________________________

     Aggregate nominal amount
     Sellers' Shares                DM 50,000
     (hereinafter collectively
     referred to as the "Shares")
     __________________________________________________________
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 5

2.   SALE AND PURCHASE

2.1  Sellers hereby agree to sell and Acquirer hereby agrees to purchase as of
     the date hereof (the "Closing Date") all of the Shares including the profit
     entitlement for the current business year.

2.2  The purchase price for the sale and transfer of the Shares pursuant to
     Subsec. 2.1 shall be the total amount of Twenty-Two Million Four Hundred
     Eighty-One Thousand Two Hundred Fifty-Six Deutschemarks (DM22,481,256)
     which amount is the sum of the Cash Payment and the Aggregate Share
     Consideration (subject to adjustment in accordance with Sec. 2.6)
     (hereinafter:  the "Purchase Price").

2.3  On the Closing Date, the Acquirer shall deliver, as payment of the Purchase
     Price, the following:

     (a)  to the Sellers the amount of Eight Million One Hundred Seventy-Five
          Thousand  Deutschemarks (DM 8,175,000) (the "Cash Payment") by wire
          transfer free of charges to the respective accounts designated by the
          Sellers and in the respective amounts set forth opposite such Sellers'
          names on Schedule 2.3.1 attached hereto.  Payment of the Cash Payment
                   --------------                                              
          shall be effected only if and when it is fully and unconditionally
          credited, free of charges, to the accounts specified on Schedule
                                                                  --------
          2.3.1.  The parties agree and acknowledge that a payment of U.S.
          -----
          $5,000,000 will be accepted as complete fulfillment of the Cash
          Payment obligation.

     (b)  to the Sellers or their attorneys, certificates representing that
          number of ON Shares equal to the Stock Payment (as defined below), to
          be allocated among the Sellers in the proportions set forth opposite
          such Sellers' names on Schedule 2.3.2 attached hereto;
                                 --------------                 

     (c)  to Epstein Becker & Green, P.C. and Ropes & Gray, as escrow agents
          (the "Escrow Agents"), (i) certificates representing that number of ON
          Shares equal to the Escrowed Shares, to be held in the Escrow Account
          (as defined in the Escrow Agreement) and distributed pursuant to Sec.
          6 of this Agreement and the terms of the Escrow Agreement attached
          hereto as Exhibit I (the "Escrow Agreement") and (ii) certificates
                    ---------                                               
          representing that number of ON Shares equal to the Reserved Shares
          (as defined below) to be held in the Reserve Account (as defined
          below) and distributed pursuant to Sec. 2.6 of this Agreement and the
          terms of the Escrow Agreement.
<PAGE>

PURCHASE AGREEMENT                                                        PAGE 6
<TABLE> 
<CAPTION> 
<S>   <C>                                                                 
2.4  For purposes of this Sec. 2, the following definitions shall apply:

     (a)  "Aggregate Share Consideration" shall mean Fourteen Million Three
          Hundred and Six Thousand Two Hundred Fifty-Six Deutschemarks (DM
          14,306,256).

     (b)  "Escrow Proportion", with respect to each Seller, means a fraction the
          numerator of which is that number of ON Shares allocable to such
          Seller pursuant to Schedule 2.4.2 and the denominator of which is 263,158. 
                             --------------                                
          

     (c)  "ON Shares" shall mean the common stock, $.01 par value per share, of
          ON Technology Corporation, a Delaware corporation.

     (d)  "ON Share Price" shall mean DM 10.87275 (corresponding to U.S. $6.65)
          per share.

     (e)  "Escrowed Shares" shall mean 263,158 ON Shares.

     (f)  "Reserved Shares" shall mean 78,514 ON Shares.

     (g)  "Stock Payment" shall mean that number of ON Shares calculated by
          subtracting from the Total Purchase Shares (i) the Escrowed Shares and
          (ii) the Reserved Shares.

     (h)  "Total Purchase Shares" shall mean that number of ON Shares calculated
          by dividing (i) Aggregate Share Consideration by (ii) the ON Share
          Price.

2.5  The Cash Payment shall be due and payable on the Closing Date.  Payment
     shall be timely only if it is credited, as specified in Subsec. 2.3.1, to
     the client trust account of Ropes & Gray for the joint benefit of the
     Sellers, such account being identified on Schedule 2.5 attached hereto.
                                               ------------                 

2.6  The Reserve Account shall be established and administered as follows:

     (a)  Within sixty (60) days after the Closing Date, ON, at its cost and
          expense, shall cause the Auditors to prepare and deliver to Sellers an
          audited balance sheet of csd as of the Closing Date (the "Final
          Closing Date Balance
</TABLE> 
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 7

          Sheet") prepared in accordance with German GAAP (as defined below)
          consistent with the preparation of the Current Financial Statements
          (as defined below).

     (b)  If stockholders' equity as shown on the Final Closing Date Balance
          Sheet is less than zero, then:

          (a)  if the amount of such deficit is greater than DM 853,663, then
               (i) Sellers shall, each in the proportion set forth opposite such
               Seller's name on Schedule 2.3.2 attached hereto, reconvey to
                                --------------                             
               Acquirer certificates representing that number of ON Shares
               calculated by dividing (x) the amount of such difference by (y)
               DM 10.87275 and (ii) the Escrow Agents shall release from the
               Reserve Account the Reserved Shares and deliver such shares to
               Acquirer; or

          (b)  if the amount of such deficit is equal to DM 853,663, then the
               Escrow Agents shall release from the Reserve Account the Reserved
               Shares and deliver such shares to Acquirer; or

          (c)  if the amount of such deficit is less than DM 853,663, then (i)
               the Escrow Agents shall release from the Reserve Account
               certificates representing that number of ON Shares calculated by
               dividing (x) the amount of such difference by (y) DM 10.87275,
               and the Escrow Agents shall deliver to each Seller that Seller's
               Escrow Proportion (if any) of such released Reserved Shares and
               (ii) the Escrow Agents shall release from the Reserve Account the
               remaining Reserved Shares and shall deliver such Reserved Shares
               to Acquirer.

For purposes of the above definitions, any fractional shares shall be rounded to
the nearest whole share.

3.   ASSIGNMENT AND INDIVIDUAL SELLERS' REPRESENTATIONS

     3.1  Subject to and upon the terms and conditions of this Agreement, each
          Seller herewith assigns to this accepting Acquirer, with effect as of
          the Closing Date, all of his or her respective shares in csd, such
          assignment being made subject to the condition precedent
          (aufschiebende Bedingung) that the Purchase Price has been fully paid
          in accordance with Sec. 2.
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 8

     3.2  Each Seller severally represents and warrants that the following
          representations and warranties are true and complete:

          3.2.1  Such Seller has good and marketable title to the Shares which
                 are to be transferred to the Acquirer by such Seller pursuant
                 hereto. Such Shares are free and clear of any and all
                 covenants, conditions, restrictions, voting trust arrangements,
                 liens, charges, encumbrances, options and adverse claims or
                 rights whatsoever. Such Seller has the full right, power and
                 authority to enter into this Agreement and to transfer, convey
                 and sell to the Acquirer the Shares to be sold by such Seller
                 hereunder and, upon consummation of the purchase contemplated
                 hereby, the Acquirer will acquire from such Seller good and
                 marketable title to such Shares, free and clear of all
                 covenants, conditions, restrictions, voting trust arrangements,
                 liens, charges, encumbrances, options and adverse claims or
                 rights whatsoever, exclusive of any liens, charges,
                 encumbrances and adverse claims or rights that may arise solely
                 upon the Acquirer's acquisition of such Shares.

          3.2.2  Such Seller is not a party to, subject to or bound by any
                 agreement or any judgment, order, writ, prohibition, injunction
                 or decree of any court or other governmental body which would
                 prevent the execution and delivery of this Agreement by such
                 Seller or the transfer, conveyance and sale of the Shares sold
                 by such Seller pursuant to the terms hereof.

4.   REPRESENTATIONS AND WARRANTIES

     The Sellers, jointly and severally, hereby represent and warrant that the
     following representations and warranties are true and complete.

4.1  Corporate status

     The corporate status of csd is correctly reflected in Sec. 1 and in
                                                                        
     Schedule 4.1.  The attached excerpts from the commercial register (Schedule
     ------------                                                       --------
     4.1) reflect the status of csd correctly.
     ---                                      

     All shares of csd are fully paid up.  No repayments of capital have been
     made.
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 9

     csd is a corporation duly organized and validly existing under German law.

     csd has no subsidiaries and does not own any securities issued by any other
     business organization or governmental authority.  csd does not own or have
     any direct or indirect interest in or control of any corporation,
     partnership, joint venture or entity of any kind.

4.2  Authority to dispose of shares

     Each Seller owns the shares sold by such Seller free of any encumbrance or
     rights of third parties in its own name and on its own account and has the
     full authority to enter into and to perform this Agreement and has, except
     as provided in this Agreement, obtained all authorizations to enter into
     this Agreement.

4.3  Financial statements and related matters

     (a)  Attached hereto as Schedule 4.3.1 are (i) the unaudited balance sheet
                             --------------                                    
          of csd as of December 31, 1995 (the "1995 Balance Sheet") and the
          related statements of income, shareholders' equity, retained earnings
          and changes in financial condition of csd for the fiscal year then
          ended, together with the notes thereto (collectively, the "1995
          Financial Statements"), and (ii) the draft balance sheet of csd as of
          December 31, 1996 (the "Current Balance Sheet") and the related
          statements of income, shareholders' equity, retained earnings and
          changes in financial condition of csd for the twelve-month period then
          ended (collectively, the "Current Financial Statements").  The 1995
          Financial Statements and the Current Financial Statements are herein
          collectively referred to as the "Financial Statements."  The Financial
          Statements have been prepared in accordance with accounting principles
          generally applicable in Germany ("German GAAP") applied on a
          consistent basis throughout the period covered thereby (except that
          the 1995 Financial Statements do not contain all footnotes and related
          information required by German GAAP) and without change as in the
          preceding fiscal year of csd, except as specified otherwise in the
          Financial Statements and are accompanied by a certificate of the
          Management of csd to the effect that the Financial Statements were
          prepared in accordance with German GAAP, subject to the absence of
          footnotes and other related information required by German GAAP.  The
          Financial Statements give within the framework of German GAAP a true
          and fair view as required by German GAAP as of their respective dates,
          of the financial condition, retained earnings, assets and liabilities
          of csd and the results of operations of csd's business for the periods
          indicated.  The Current
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 10

          Balance Sheet and the accounting principles applied thereto may not be
          changed for purposes of this Agreement.

          (b)  Schedule 4.3.2 attached hereto sets forth a true, correct and
               --------------                                               
               complete list of the accounts and notes receivable of csd (the
               "Accounts Receivable"), including the aging thereof as of a date
               not more than five (5) days prior to the date hereof.  All
               Accounts Receivable arose out of the sales of inventory or
               services in the ordinary course of business and 90% of such
               Accounts Receivable are collectible in the face value thereof
               within 90 days after the date of invoice (except for the Accounts
               Receivable due from Siemens Nixdorf Informationsysteme AG, which
               is collectible in the face value thereof within 150 days after
               the date of invoice), using normal collection procedures, net of
               the reserve for doubtful accounts set forth thereon, which
               reserve is adequate and was calculated in accordance with German
               GAAP consistently applied.  All Accounts Receivable are valid,
               legal and binding, subject to no set-offs, returns or
               counterclaims.

          (c)  The general ledgers and books of account of csd, all tax returns
               filed by csd, and all other books and records of csd are in all
               material respects complete and correct and have been maintained
               in accordance with good business practice and in accordance with
               all applicable procedures required by laws and regulations.

          (d)  Schedule 4.3.4 attached hereto sets forth all prepayments and
               --------------
               deposits, which have been received by csd as of the date of the
               respective balance
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 11
                            
              
               sheets, from customers for products to be shipped, or services to
               be performed, after the Closing Date.

          (e)  There are no liabilities of csd as of the date of the respective
               balance sheets which are required to be shown in the Financial
               Statements by German GAAP and which are not shown in the
               Financial Statements.

4.4  Pension liabilities

     csd has no pension liabilities.

4.5  Personnel

     csd do not employ any employees except those listed in Schedule 4.5
                                                            ------------
     attached hereto.

     The employment conditions listed in Schedule 4.5 attached hereto give a
                                         ------------                       
     true and fair view of the employment conditions of csd including the
     service agreement conditions of the managing directors.

     There have been no increases or other changes of such conditions since the
     date of the Current Balance Sheet except (i) as a result of the relevant
     collective bargaining agreement or usual salary review for people not
     covered by a collective bargaining agreement and (ii) as listed in Schedule
                                                                        --------
     4.5 attached hereto.
     ---                 

4.6  Material agreements

     Schedule 4.6 attached hereto contains a true, complete and correct list and
     ------------                                                               
     description of the following contracts and agreements, whether written or
     oral (collectively, the "Contracts") which will continue after the Closing
     Date: (i) all loan agreements, indentures, mortgages and guaranties to
     which csd is a party or by which csd is bound; (ii) all pledges,
     conditional sale or title retention agreements, security agreements
     (including but not limited to maintenance agreements), equipment
     obligations, personal property leases and lease purchase agreements to
     which csd is a party or by which csd or its property is bound; (iii) all
     contracts, agreements, commitments, purchase orders or other understandings
     or arrangements to which csd is a party or by which csd or its property is
     bound which either involve payments or receipts
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 12


     by csd of more than U.S. $25,000 in the case of any single contract,
     agreement, commitment, understanding or arrangement under which full
     performance (including payment) has not been rendered by all parties
     thereto, or may materially adversely effect the condition (financial or
     otherwise) or the properties, assets, business or prospects of csd; (iv)
     all collective bargaining agreements, employment and consulting agreements,
     executive compensation plans, bonus plans, deferred compensation
     agreements, pension plans, retirement plans, employee stock option or stock
     purchase plans and group life, health and accident insurance and other
     employee benefit plans, agreements, arrangements or commitments to which
     csd is a party; (v) all agency, distributor, sales representative,
     franchise, partner or similar agreements to which csd is a party; (vi) all
     contracts, agreements or other understandings or arrangements between csd
     and any of the Sellers or their affiliates; (vii) all material leases or
     personal property, whether operating, capital or otherwise, under which csd
     is lessor or lessee; (viii) all contracts, agreements and other documents
     or information relating to past disposal of waste (whether or not
     hazardous); (ix) all leases of real property, identifying separately each
     ground lease, to which csd is a party (collectively, the "Real Property
     Leases") and (x) any other material agreements or contracts entered into by
     csd.

     Except as set forth on Schedule 4.6:  (i)  each such Contract is a valid
                            ------------                                     
     and binding agreement of csd, enforceable against csd in accordance with
     its terms, and the Sellers do not have any knowledge that any Contract is
     not a valid and binding agreement of the other parties thereto; (ii) csd
     has fulfilled all obligations required pursuant to the Contracts to have
     been performed by csd on its part prior to the date hereof, and the Sellers
     have no reason to believe that csd will not be able to fulfill all of its
     obligations under the Contracts which remain to be performed within 90 days
     after the date such performance is required; (iii) csd is not in breach of
     or default under any Contract, and no event has occurred which with the
     passage of time or giving of notice or both would constitute such a breach
     or default; (iv) to the best knowledge of the Sellers, there is no existing
     breach or default by any other party to any Contract; (v) no Contract is
     likely to result in a material financial loss to csd; and (vi) none of the
     Contracts contain a provision requiring the consent of any other party
     thereto, or giving rise to a right to terminate the Contract, in the event
     of a change of control of csd. True, correct and complete copies of all
     Contracts have previously been delivered to the Acquirer by the Sellers.
     True, correct and complete copies of all Real Property Leases and all
     amendments, modifications and supplemental agreements thereto, have
     previously been delivered by the Sellers or csd to the Acquirer. To the
     best knowledge of the Sellers, the Real Property Leases are in full force
     and effect, are binding and enforceable against each of the parties thereto
     in accordance with their respective terms. The Real Property Leases have
     not been modified or amended since the date of delivery to the Acquirer. To
     the best knowledge of the Sellers, no party to any Real Property Lease has
     sent written notice to the other claiming that such party is in default
     thereunder and that such default remains uncured. There has not occurred
     
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 13

     any event which would constitute a breach of or default in the performance
     by csd of any covenant, agreement or condition contained in any Real
     Property Lease, nor has there occurred any event which with the passage of
     time or the giving of notice or both would constitute such a breach or
     default.

4.7  Administrative approvals, licenses

     (a)  csd has obtained all material administrative approvals and licenses
          which are required for the operation of its business as presently
          conducted, including, without limitation, all administrative approvals
          and licenses that may be required pursuant to applicable Environmental
          Laws for the occupation of the real property subject to the Real
          Property Leases (as hereinafter defined) and the operation of csd's
          business ("Administrative Approvals and Licenses").  Schedule 4.7
                                                               ------------
          attached hereto sets forth a true, correct and complete list of such
          Administrative Approvals and Licenses.

     (b)  The business of csd as presently conducted is materially in compliance
          with all applicable legal and administrative provisions including,
          without limitation, all applicable laws relating to public health and
          safety, worker health and safety and pollution and protection of the
          environment ("Environmental Laws").

     (c)  Except as set forth on Schedule 4.7, csd has not had notice or
                                 ------------                           
          communication from any governmental authority since January 1, 1994 of
          any violation or noncompliance with such legal or administrative
          provisions, and to the best knowledge of the Sellers, there are no
          outstanding notices of any such violation or noncompliance which have
          not been cured.

4.8  Litigation

     Except as shown in Schedule 4.8 attached hereto:
                        ------------                 

     (a)  csd is not involved, whether as defendant or as plaintiff, in any
          material litigation or material arbitration proceedings, nor, to the
          best of Sellers' knowledge, are any claims, actions or proceedings
          threatened.
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 14

     (b) csd has not been permanently or temporarily enjoined by any order,
         judgment or decree of any governmental authority from engaging in or
         continuing any practice in connection with the business, assets or
         properties of csd. There is not in existence on the date hereof any
         such order, judgment or decree.

4.9  Taxes

     csd has:

     (a)  filed all tax returns and other returns to be filed according to
          applicable law when due, and all such returns are complete and correct
          in all respects;

     (b)  paid all taxes and duties due and no tax lien has been filed and no
          lien is being asserted with respect to any taxes or duties; and

     (c)  withheld and passed on to the relevant tax authorities and social
          security parties all taxes and social security charges which it is
          required to deduct from any payments to employees or others.

4.10 Interim business developments

     Except as provided in Schedule 4.10 attached hereto, since the date of the
                           -------------                                       
     Current Balance Sheet:

     (a)  csd has not entered into any contract or commitment or taken any other
          action that is not in the ordinary course of business as conducted in
          prior periods;

     (b)  there has not been any damage, accident or other detrimental event
          materially affecting the business of csd or the consummation of the
          transactions contemplated hereby;

     (c)  neither csd nor the Sellers have knowledge of any existing or
          threatened damage, accident or other detrimental event materially
          affecting the business of csd or the consummation of the transactions
          contemplated hereby;

     (d) there has been no change in the capital structure of csd;
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 15

     (e)  there has been no resolution to pay dividends to the Sellers and no
          payment to the Sellers of a dividend or any other distribution (except
          arms length interest payment) by  csd to the Sellers.

4.10.6    there has been no increase in the compensation of any employee and
          no lump sum payments have been made to any employee.

4.11 Insurance

     (a)  Schedule 4.11 attached hereto sets forth a true, correct and complete
          -------------                                                        
          list of all fire, theft, casualty, general liability, business
          interruption, environmental impairment, product liability, automobile
          and other insurance policies maintained by csd and of all life
          insurance policies maintained on the lives of any of its employees,
          specifying the type of coverage, the amount of coverage, the insurer
          and the expiration date of each such policy (collectively, the
          "Insurance Policies").  True, correct and complete copies of all
          Insurance Policies have been previously delivered to the Acquirer by
          the Sellers or csd.  The Insurance Policies are in full force and
          effect and are, to the best of Seller's knowledge, in amounts and of a
          nature which are adequate and customary for csd's business.  All
          premiums due on the Insurance Policies or renewals thereof have been
          paid, and there are no defaults (including with respect to the payment
          of premiums or the giving of notices) by csd under the Insurance
          Policies nor any default by any other party to the Insurance Policies
          that is known by the Sellers, and no event has occurred which, with
          notice or the lapse of time, would constitute such a breach or default
          or permit termination, modification or acceleration, under any
          Insurance Policy.  csd has not received any notice from the insurer
          denying coverage or reserving rights with respect to a particular
          claim currently pending or any Insurance Policy in general.  Since
          January 1, 1993, csd has not incurred any loss, damage, expense or
          liability that has had or would reasonably be expected to have a
          material adverse effect on csd's condition, property, assets or
          business, taken as a whole and that was or would be covered by any
          Insurance Policy for which csd has not properly asserted a claim under
          any Insurance Policy.  There are no outstanding recommendations by any
          issuer of an Insurance Policy or by any board of insurer underwriters
          or other similar body exercising similar functions or by any
          governmental authority exercising similar functions which requires or
          recommends any changes in the conduct of the business
          of, or any repairs or other work to be done on or with respect to any
          of the properties or assets of, csd.

     4.12 Intangible Property
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 16


          (a)  Schedule 4.12.1 attached hereto sets forth a true, correct and
               ---------------                                               
               complete list and, where appropriate, a description of all
               material items of intangible property (other than Programs, which
               are specifically referenced in Sec. 4.12.3 below) owned by csd
               (the "Owned Intangible Property") or used in the business of, csd
               but not owned by them (the "Licensed Intangible Property", and,
               together with the Owned Intangible Property, the "Intangible
               Property"), including, without limitation, all patents,
               copyrights, trademarks and material trade secrets.  Except as
               otherwise disclosed in Schedule 4.12.1:  (i) except for the
                                      ---------------                     
               provisions of the German Statute of Employees' Inventions, as far
               as applicable, csd is the sole and exclusive owner of all right,
               title and interest in and to the Owned Intangible Property and
               all designs, permits, labels and packages used on or in
               connection therewith, free and clear of all liens, security
               interests, charges, encumbrances, equities and other adverse
               claims; (ii) csd has, to the best of Sellers' knowledge, the
               right and authority to use the Intangible Property in connection
               with the conduct of its business in the manner presently
               conducted or conducted by csd at any time within five years prior
               to the date hereof, and to the best knowledge of the Sellers,
               such use does not conflict with, infringe upon or violate any
               rights of any other person, corporation or entity; (iii) neither
               csd nor any of the Sellers has received notice of a pleading or
               threatened claim, interference action or other judicial or
               adversarial proceeding against csd alleging that csd's
               operations, activities, products, services or publications
               infringe any patent, trademark, trade name, copyright, trade
               secret or other property right of a third party, or that it is
               illegally or otherwise using the trade secrets, formulae or
               property rights of others; and (iv) there are no outstanding
               disputes or other disagreements with respect to any licenses or
               similar agreements or arrangements described in Schedule 4.12.1
                                                               ---------------
               or with respect to infringement by a third party of any of the
               Intangible Property.  Each item of Intangible Property owned or
               used by csd immediately prior to the Closing Date will be owned
               or available for use by the Acquirer on identical terms and
               conditions immediately subsequent to the Closing Date.

          (b)  All employees and other persons currently employed or retained by
               csd who have participated in the development of the Intangible
               Property or the Programs or who have had access to the source
               code of any Intangible Property or Program have executed and
               delivered to csd the form of Non-Disclosure Agreement attached
               hereto as Schedule 4.12.2.
                         --------------- 
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 17
 
          (c)  Schedule 4.12.3 attached hereto accurately identifies all
               ---------------                                          
               computer programs, currently owned, licensed from third parties
               or currently under development by csd, excluding "off the shelf",
               mass marketed software programs licensed by the Company from
               commercial vendors  (collectively, the "Programs").  Except as
               disclosed in Schedule 4.12.3, all present and prior versions of
                            ---------------                                   
               the Programs constitute original works-for-hire compiled or
               prepared by employees of or consultants to csd.  All such
               versions of the Programs are proprietary to csd; all right, title
               and interest in and with respect to such versions are vested
               solely in csd (other than Urheberpersoenlischkeitsrechte which
               cannot be waived or assigned), and no royalties or other payments
               are payable with respect to the Programs or any portion thereof
               except under agreements listed on Schedule 4.6 hereto; and csd
                                                 ------------                
               has all documentation reasonably necessary to enforce their
               proprietary rights in such Programs.  To the best of Sellers'
               knowledge, none of the Programs contain any so-called "virus"
               which restricts or impairs the proper operation of the Program or
               any computer software or hardware (including any peripheral) on
               which or with which any Program operates or is intended to
               operate, or which, other than as decided by the user, propagates
               itself.  csd has taken all reasonable steps to protect the source
               code of the Programs as proprietary trade secrets.  csd has
               disclosed its proprietary trade secrets only to consultants,
               legal and accounting advisors, investors, distributors, customers
               and employees of csd and only after such persons (excluding
               advisors who are otherwise bound by law to do so) have executed
               agreements not to disclose such proprietary trade secrets
               sufficient to maintain the proprietary nature of such trade
               secrets under law.  Except for deviations stated in the Release
               Notes to the programs, the Programs perform in accordance with
               csd's user manuals therefor in all material respects.

4.13 Absence of Undisclosed Liabilities

     Except as and to the extent (i) reflected and reserved against in the
     Current Balance Sheet, (ii) set forth on Schedule 4.13 attached hereto, or
                                              -------------                    
     (iii) incurred in the ordinary course of business after the date of the
     Current Balance Sheet and not material in amount (either individually or in
     the aggregate), the Company has no liability or obligation, secured or
     unsecured, whether accrued, absolute, contingent, unasserted or otherwise,
     which is material to the condition (financial or otherwise) of the assets,
     properties, business or prospects of csd taken as a whole.  For purposes of
     this Subsection, "material" means any amount in excess of U.S. $15,000.
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 18

4.14 Real Property

     The Company does not own any real property.

4.15 Inventory

     The Current Balance Sheet reflects, net of applicable reserves, the
     inventory of csd as of the date thereof.  The inventory consists of items
     of a quality and quantity which are usable and saleable without non-
     ordinary course discount in the business conducted by csd.  The value of
     all items of obsolete materials and of materials of below standard quality
     have been written down to realizable market value and the values at which
     such inventory is carried reflect the normal inventory valuation policy of
     csd as consistently applied with csd's past practice and in accordance with
     German GAAP.  csd's Current Balance Sheet fairly presents the value of
     csd's inventory as of the date thereof and, other than transactions in the
     ordinary course of business, there has been no change in csd's inventory
     that would have a material adverse effect on csd's business, taken as a
     whole, since the date of the Current Balance Sheet.  For purposes of this
     Section, "material" means any amount in excess of U.S. $15,000.

4.16 Warranty and product liability claims

     (a)  Each Program and other product manufactured, sold, leased, licensed or
          delivered by csd (collectively, "Product") has been manufactured,
          sold, leased, licensed or delivered in material conformity with all
          applicable contractual commitments and all express and implied
          warranties, and csd has no liability (and there is no basis for any
          present or future action, suit, proceeding, hearing, investigation,
          charge, complaint, claim or demand against csd giving rise to any such
          liability) for replacement or repair thereof or other damage in
          connection therewith, subject only to the reserve for product warranty
          claims set forth on the Current Balance Sheet. No Product is subject
          to any guaranty, warranty or other indemnity materially different from
          the standard terms and conditions set forth in the model form of
          license agreement attached as Schedule 4.16.1 hereto. Schedule 4.16.1
                                        ---------------         ---------------
          hereto includes copies of the current standard terms and conditions of
          the license agreements used by csd (containing applicable guaranty,
          warranty and indemnity provisions).

     (b)  There are no claims for returns or trial use arrangements which could
          result in the return of Products by reason of any alleged
          overshipment, defective equipment, the expiration of trial use
          arrangements or otherwise.  There 
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 19

          are no Products in the hands of customers under any understanding that
          such Product would be returnable other than pursuant to the standard
          return policy set forth in the model written license attached as
          Schedule 4.16.2 hereto. Neither the execution and delivery of this
          ---------------
          Agreement nor the consummation of the transactions contemplated hereby
          will result in any cancellations or withdrawals of accepted or
          unfilled orders for the sale, license, lease or other transfer of any
          Product.

     (c)  Schedule 4.16.3 attached hereto contains a true, correct and complete
          ---------------                                                      
          list of all material warranty and product liability claims made
          against csd from January 1, 1994 through the date hereof, the current
          status of all such claims and the costs of all actions taken in
          satisfaction of such claims.  All information relative to such claims
          and those arising thereafter shall be available to the Acquirer from
          and after the date hereof.

4.17 Customers

     Schedule 4.17 attached hereto sets forth a true, correct and complete list
     -------------                                                             
     of the names and addresses of all customers of csd which accounted for more
     than 5% of csd's total sales in the twelve months ended December 31, 1996.

4.18 Suppliers

     Schedule 4.18 attached hereto sets forth a true, correct and complete list
     -------------                                                             
     of the names and addresses of the ten suppliers of csd which accounted for
     the largest dollar volume of purchases by the Company in the twelve
     months ended December 31, 1996.  None of the suppliers has notified csd in
     writing that it intends to discontinue its relationship with csd.

4.19 Indebtedness to and from Officers and Directors

     csd is not indebted, directly or indirectly, to any person who is an
     officer, director or shareholder of csd or any affiliate of any such person
     in any amount whatsoever other than for salaries for services rendered or
     reimbursable business expenses, all of which have been reflected on the
     Current Financial Statements, and no such officer, director, shareholder or
     affiliate is indebted to csd, except for advances made to employees of csd
     in the ordinary course of business to meet reimbursable business expenses
     anticipated to be incurred by such obligor.
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 20

4.20 Third-Party Consents

     Schedule 4.20 attached hereto sets forth all material third-party consents
     -------------                                                             
     needed by the Sellers and csd to consummate the transaction contemplated
     hereby.

4.21 Brokers' Fees

     Except for fees payable to The Updata Group by the Acquirer, neither csd
     nor any of Sellers has any liability or obligation to pay any fees or
     commissions to any brokers, finder or agent with respect to the
     transactions contemplated herein.

4.22 Section 419 of German Civil Code

     The shares sold by each Seller do not constitute all or essentially all of
     the assets of such seller in the sense of Section 419 of the German Civil
     Code.

4.23 Tax Status of Shares


     Since January 28, 1987 or the date of the incorporation of csd, whichever
     is later, the shares sold hereunder were held by individuals who were
     resident in Germany and subject to unlimited German taxation.


5.   GENERAL PROVISIONS CONCERNING REPRESENTATIONS AND WARRANTIES

5.1  To the extent that representations and warranties refer to the best of
     Seller's knowledge, the knowledge of a manager (Geschaftsfuhrer) of csd
     shall be deemed to constitute knowledge of the Sellers.  "Knowledge" shall
     mean knowledge after reasonable investigation of the applicable matter.

6.   INDEMNIFICATION

6.1  The Sellers, jointly and severally, hereby indemnify and hold harmless the
     Acquirer and csd from and against all material claims, damages, losses,
     liabilities, costs and expenses (including, without limitation, settlement
     costs and any legal,
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 21

     accounting or other expenses for investigating or defending any actions or
     threatened actions) (collectively, the "Losses") in connection with any
     breach or non-performance by the Sellers of any representation, warranty,
     covenant or condition contained in this Agreement and any certificates,
     exhibits, schedules or documents delivered hereunder. The indemnity under
     this Subsec. 6.1 extends only to the net amount of any Loss sustained by
     the Acquirer after deducting therefrom any amount which the Acquirer or any
     of its subsidiaries recovers as proceeds of insurance in respect of such
     Loss, net of any cost of collection, deductible, retroactive premium
     adjustment, reimbursement obligation, or other cost directly related to the
     insurance claim for such Loss and net of any tax payable in respect of such
     recovery; provided that the Acquirer is not required under this Section to
     make a claim under or seek recovery from any insurance policy or policies
     it may maintain.

6.2  The Acquirer hereby indemnifies and holds harmless the Sellers and the
     Company from and against all material Losses in connection with any breach
     or non-performance by the Acquirer of any representation, warranty,
     covenant or condition contained in this Agreement and any certificates,
     exhibits, schedules or documents delivered hereunder.

6.3  Whenever any claim shall arise for indemnification under this Sec. 6, the
     Acquirer, the Sellers or csd, as the case may be (the party seeking such
     indemnification being the "Indemnified Party"), shall promptly notify the
     other party or parties hereto (such party or parties, the "Indemnifying
     Party") in writing (the "Indemnification Notice") of the claim, which
     writing shall include the facts constituting the basis for such claim, the
     specific section of this Agreement upon which the claim is based and an
     estimate, if possible, of the amount of damages suffered by the Indemnified
     Party. In the event of any such claim for indemnification hereunder
     resulting from or in connection with any claim or legal proceedings by a
     third party (a "Third Party Claim"), the Indemnification Notice shall
     specify, if known, the amount or an estimate of the amount of the liability
     arising therefrom and shall attach all correspondence and demands from such
     third party. In the event that any claim for indemnification involves a
     matter other than a Third Party Claim, the Indemnifying Party shall have
     thirty (30) days from receipt of the Indemnification Notice to object to
     such claim by delivery of a written notice of such objection to the
     Indemnified Party specifying in reasonable detail the basis for such
     objection. If an objection is timely interposed by the Indemnifying Party
     and the dispute is not resolved within twenty (20) business days from the
     date (such period is hereinafter referred to as the "Negotiation Period")
     the Indemnified Party receives such objection, such dispute shall be
     resolved by arbitration in accordance with the provisions of Sec. 12
     hereof. The Indemnified Party shall not settle or compromise any Third-
     Party Claim by a third party for which it is entitled to indemnification
     hereunder without the prior written consent, which shall not be
     unreasonably withheld or delayed, of the Indemnifying Party; provided,
                                                                  --------
     however, that if suit shall have been instituted against the Indemnified
     -------
     Party and the
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 22

     Indemnifying Party shall not have assumed the defense of such suit within
     ten (10) days after notification thereof, the Indemnified Party shall have
     the right to settle or compromise such claim upon giving notice to the
     Indemnifying Party, so long as such settlement includes a release of the
     Indemnifying Party from the Third Party Claim.

     (a)  In connection with any claim which may give rise to indemnity
          hereunder resulting from or arising out of any Third Party Claim, the
          Indemnifying Party, at the sole cost and expense of the Indemnifying
          Party, may, upon written notice given to the Indemnified Party, assume
          the defense of any such claim or legal proceeding if the Indemnifying
          Party acknowledges to the Indemnified Party in writing the obligation
          of the Indemnifying Party to indemnify the Indemnified Party with
          respect to all elements of such claim, subject to the limitations
          contained in this Sec. 6.  If the Indemnifying Party assumes the
          defense of any such claim or legal proceeding, the Indemnifying Party
          shall select counsel reasonably acceptable to the Indemnified Party to
          conduct the defense of such claims or legal proceedings and, at the
          sole cost and expense of the Indemnifying Party, shall take all steps
          necessary in the defense or settlement thereof.  The Indemnifying
          Party shall not consent to a settlement of, or the entry of any
          judgment arising from, any such claim or legal proceeding without the
          prior written consent of the Indemnified Party (which consent shall
          not be unreasonably withheld or delayed).  The Indemnified Party shall
          be entitled to participate in (but not control) the defense of any
          such action, with its own counsel and at its own expense.  If the
          Indemnifying Party does not assume the defense of any such claim or
          litigation resulting therefrom within ten (10) days after the date
          such claim is made:  (i) the Indemnified Party may defend against such
          claim or litigation in such manner as it may deem appropriate,
          including, but not limited to, settling such claim or litigation,
          after giving notice of the same to the Indemnifying Party, on such
          terms as the Indemnified Party may deem appropriate, and (ii) the
          Indemnifying Party shall be entitled to participate in (but not
          control) the defense of such action, with its counsel and at its own
          expense.  If the Indemnifying Party thereafter seeks to question the
          manner in which the Indemnified Party defended such third party claim
          or the amount or nature of any such settlement, the Indemnifying Party
          shall have the burden to prove by a preponderance of the evidence that
          the Indemnified Party did not defend or settle such Third Party Claim
          in a reasonably prudent manner.

     (b)  The Indemnifying Party and the Indemnified Party shall cooperate with
          each other in all reasonable respects in connection with the defense
          of any Third- Party Claim, including making available records relating
          to such claim and furnishing employees of the Indemnified Party as may
          be reasonably necessary for the preparation
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 23

          of the defense of any such Third Party Claim or for testimony as
          witnesses in any proceeding relating to a Third Party Claim.

6.4  The Sellers agree that upon a final determination of an indemnification
     claim made by the Acquirer, whereby such final determination is by reason
     of (i) a failure of the Indemnifying Party to timely object to an
     Indemnification Notice, (ii) the mutual agreement of the Indemnifying Party
     and the Indemnified Party, or (iii) a final arbitration award pursuant to
     Sec. 12 hereof, then the amount of the Losses stated in such claim or
     otherwise agreed to or awarded, as the case may be, shall be paid solely,
     except as provided below, from the Escrow Account as provided in the Escrow
     Agreement and the Acquirer shall not have any recourse against any
     Stockholder's assets or properties, except for recovery from the Escrow
     Account.  Each of the Sellers acknowledges that certain of the Sellers have
     no interest in the Escrowed Shares ("Non-Escrow Sellers") and that such
     Non-Escrow Sellers are therefore not liable for any indemnification claim
     satisfied solely by Escrowed Shares.  Each of the Sellers hereby agrees
     that any claim arising by reason of the foregoing circumstances shall be
     limited solely to a claim of contribution against the Non-Escrow Sellers.
     Notwithstanding the foregoing, to the extent that any amounts are to be
     paid for Losses arising out of a breach of the representations or
     warranties set forth in Secs. 4.2, 4.9 and 4.12 (with respect to third-
     party claims thereunder only) and Subsec. 4.7.2 herein and the value of the
     Escrowed Shares in the Escrow Account is insufficient to pay such claim(s)
     in full (when valued in accordance with Sec. 4 of the Escrow Agreement),
     then, in addition to the payment to the Acquirer from the Escrow Account,
     the Indemnifying Party shall pay the amount of such deficiency to the
     Acquirer in cash or by cashier's check. All indemnification payments to an
     Indemnified Party hereunder if the Indemnified Party is other than the
     Acquirer shall be effected by payment of cash or delivery of a cashier's
     check to the Indemnified Party in the amount of the indemnification
     liability. In the event an indemnification claim with respect to Section
     4.3.2 is actually paid and thereafter but prior to July 29, 1998, the
     Account Receivable which gave rise to such claim is paid, the Acquirer will
     remit such payment to Ropes & Gray as agent for the Sellers.

6.5  Notwithstanding anything to the contrary in this Sec. 6 or elsewhere in
     this Agreement, (i) the Acquirer's exclusive remedy under or in connection
     with this Agreement shall be indemnification in accordance with this Sec. 6
     and (ii) the maximum liability of the Sellers to the Acquirer for all
     Losses, other than Losses arising out of a breach of the representations or
     warranties set forth in Secs. 4.2, 4.9 and 4.12 (with respect to
     third-party claims thereunder only) and Subsec. 4.7.2, shall be equal to
     the value of the Escrowed Shares (when valued in accordance with Sec. 4 of
     the Escrow Agreement) and all such Losses must be satisfied from the Escrow
     Account. To the extent that Losses relate to claims for fraud or breach of
     the representations or warranties set forth in Secs. 4.2, 4.9 and 4.12
     (with respect to
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 24

     third-party claims thereunder only) and Subsec. 4.7.2, the maximum
     liability of the Sellers and the Company to the Acquirer for all such
     claims shall be equal to seventy-five percent (75%) of the Purchase Price,
     and all such claims must be satisfied first from the Escrow Account and
     then, to the extent that the value of the Escrowed Shares is insufficient,
     by payment pursuant to Sec. 6.4.

6.6  The Indemnified Party shall not be entitled to receive, and the
     Indemnifying Party shall not be obligated to pay, any amounts under this
     Sec. 6 unless and until the aggregate amount of all Losses by an
     Indemnified Party under this Sec. 6 exceeds U.S. $100,000 (the "Basket");
     provided that the Basket shall not apply to Losses arising by a breach of
     Section 4.2.  The parties hereto agree that once the aggregate amount of
     Losses by any Indemnified Party exceeds the Basket, the Indemnified Party
     shall be entitled to indemnity for the amount of all claims made by the
     Indemnified Party only to the extent they exceed the Basket.

6.7  Unless otherwise provided herein, all of the representations and warranties
     contained in this Agreement shall survive until July 28, 1998 (the
     "Survival Date"), except for claims, if any, (a) asserted in writing prior
     to such Survival Date and identified as a claim for indemnification
     pursuant to this Sec. 6, or (b) which are based upon fraud, or which are
     based upon a breach of the representations or warranties set forth in Secs.
     4.2, 4.9 and 4.12 (with respect to third-party claims thereunder only) and
     Subsec. 4.7.2 which shall survive until the statute of limitations applied
     in each case to the subject matter of the applicable representation of
     warranty (i.e. for taxes, the statute of limitation on taxes).

6.8  The consideration paid by the Acquirer to the Sellers to acquire the Shares
     and the other terms of this Agreement have been established by the parties
     hereto based on the allocation of risk and rights of recovery hereunder.
     The Acquirer has had an opportunity to do due diligence and, accordingly,
     has agreed to limit its right to recourse as set forth in this Sec. 6.  The
     Acquirer, the Sellers, csd and the affiliates of each shall have no claim
     or cause of action, whether in contract, tort, under statute or otherwise,
     for damages arising out of, or relating to, this Agreement, or any
     certificates, exhibits, schedules or documents delivered hereunder, or any
     of the transactions contemplated including, without limitation, claims for
     damages, proportionate reduction of the purchase price (Minderung) or
     rescission (Rucktritt, Wandlung, Ruckgangigmachung des Vertrages) and any
     and all claims of Acquirer which might otherwise be available under German
     law on the grounds of representations or warranties implied by fact or law
     for violation of obligations in negotiations (culpa in contrahendo) or on
     any other basis apart from the right to indemnification pursuant to this
     Sec. 6.
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 25

7.   REPRESENTATIONS AND WARRANTIES OF ACQUIRER

     Acquirer represents and warranties to Sellers that the following
     representations and warranties are correct:

7.1  Corporate Status

     The Acquirer is a corporation duly organized and validly existing under the
     laws of Germany, with full corporate authority to enter into this Agreement
     to complete the transactions and to fulfill the obligations contemplated
     herein.  All corporate action required to authorize this Agreement for the
     Acquirer has been duly taken.

7.2  Validity of the Agreement

This agreement is legally valid and binding on the Acquirer.

7.3  Governmental Consents

     For the execution and performance of this Agreement, the Acquirer does not,
     unless expressly as set forth on Schedule 7.3 attached hereto, require any
                                      ------------                             
     governmental or administrative consent or permission.

7.4  Third-Party Consents

     Schedule 7.4 attached hereto sets forth all material third-party consents
     ------------                                                             
     needed by the Acquirer to consummate the transactions contemplated herein.

7.5  SEC Filings by the Acquirer's U.S. Parent

     ON Technology Corporation, a Delaware corporation ("ON USA") has, in
     accordance with the Securities Act of 1933, as amended, the Securities and
     Exchange Act of 1934, as amended, and the rules and regulations of the
     Securities and Exchange Commission (the "SEC") promulgated thereunder,
     prepared and filed with the SEC such information, documents and reports as
     the SEC may require or prescribe under Sec. 13 of the Securities and
     Exchange Act of 1934, as amended.  Neither this Agreement and the exhibits
     and schedules hereto, taken as a whole, nor any of the information,
     documents
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 26

     or reports filed by ON with the SEC, contains or will contain any untrue
     statement of a material fact or omits to state a material fact necessary in
     order to make the statements contained herein and therein in the context in
     which they were made no misleading. Neither the Acquirer nor ON knows of
     any information or fact which has or would have a material adverse effect
     on the financial condition, business or prospects of ON which has not been
     disclosed to Sellers in writing; provided that no representation or
     warranty is made as to future financial performance or the impact of the
     transactions contemplated by this Agreement on the business of ON.

7.6  Except for fees payable to The Updata Group, the Acquirer does not have any
     liability or obligation to pay any fees or commissions to any brokers,
     finder or agent with respect to the transactions contemplated herein.

8.   COMPLETE PERFORMANCE, PERIOD AFTER CLOSING

8.1  Sellers undertake to execute any documents which may after the Closing
     Date, or if later, the day on which all conditions with regard to the valid
     assignment of the Shares as referred to in Sec. 3 are met, still be
     necessary in order to vest in the Acquirer full title to the Shares and to
     assist the Acquirer in exercising all rights with respect thereto and to
     carry out the purpose and intent of this Agreement.

8.2  The Acquirer shall see to it that csd will grant to Sellers also in the
     future the right to inspect, and take copies of, books and records of csd,
     to the extent that Sellers request such access and right to make copies for
     tax reasons, for reasons of defense of claims or for any other legitimate
     reason connected with this Agreement or with Sellers' present ownership of
     csd.

8.3  It is the Acquirer's intention to grant options to purchase ON Shares to
     substantially all csd employees consistent with ON's current stock
     incentive policies for employees in corporate positions at ON.

8.4  The Acquirer acknowledges that Messrs. von Ruxleben, Heiter and Moller are
     guarantors of a line of credit of DM 2,000,000 made to csd by Bayerische
     Hypotheken und Wechselbank Munchen ("Hypobank").  The Acquirer agrees to
     use all reasonable efforts to obtain, as soon as practicable, the release
     of all of such guaranties and further agrees to indemnify and hold harmless
     each of Messrs. von Ruxleben, Heiter and Moller from and against any and
     all claims and liabilities arising by reason of such guaranties.
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 27

9.   BEST EFFORTS TO OBTAIN SATISFACTION OF CONDITIONS

     The Sellers, csd and the Acquirer covenant and agree to use their best
     efforts to obtain the satisfaction of the conditions specified in this
     Agreement.

10.  FULFILLED CONDITIONS TO OBLIGATIONS OF THE ACQUIRER

     The obligations of the Acquirer under this Agreement are subject to the
     fulfillment, at the Closing Date, of the following conditions precedent,
     each of which is hereby acknowledged to have been satisfied or waived.

10.1 Corporate Proceedings.

     All corporate and other proceedings required to be taken on the part of csd
     to authorize or carry out this Agreement and the transactions contemplated
     hereby have been taken.

10.2 Governmental Approvals.

     All governmental agencies, department, bureaus, commissions and similar
     bodies, the consent, authorization or approval of which is necessary under
     any applicable law, rule, order or regulation for the consummation by the
     Sellers, csd or the Acquirer of the transactions contemplated by this
     Agreement and the operation of the business of csd by the Acquirer have
     consented to, authorized, permitted or approved such transactions.

10.3 Consent of Third Parties.

     The Sellers and csd have received all requisite consents and approvals of
     all lenders, lessors and other third parties whose consent or approval is
     required in order for the Sellers and csd to consummate the transactions
     contemplated by this Agreement, including without limitation, those set
     forth on Schedule 4.20 attached hereto.
              -------------                 

10.4 Adverse Proceedings.
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 28

     No action or proceeding by or before any court or other governmental body
     have been instituted or, to the best knowledge of the Sellers, threatened
     by any governmental body or person whatsoever which shall seek to restrain,
     prohibit or invalidate the transactions contemplated by this Agreement or
     which might affect the right of the Acquirer to own the Shares or to own or
     operate the business of csd after the Closing.

10.5 Employment Agreements.

     csd has executed an employment agreement with each of Mr. Heiter, Mr. von
     Ruxleben and Mr. Moller, copies of which are attached as Exhibits K-1, K-2
                                                              -----------------
     and K-3, respectively (collectively, the "Employment Agreements").
     -------                                                           

10.6 Registration Rights Agreement.

     ON has executed a registration rights agreement with the Sellers, a copy of
     which is attached as Exhibit L (the "Registration Rights Agreement").
                          ---------                                       

10.7 Material Adverse Effect.

     There has been no material adverse change in the business, operations,
     customers, conditions (financial or otherwise) or prospects of csd since
     the date of the Current Balance Sheet.
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 29

10.8 Closing Deliveries.

     The Acquirer has received at or prior to the Closing such documents,
     instruments or certificates as the Acquirer may reasonably request
     including, without limitation:

     (i)  an approval by csd of the transfer of the Shares; and

     (ii) a fully executed Escrow Agreement.

11.  FULFILLED CONDITIONS TO OBLIGATIONS OF THE SELLERS

     The obligations of the Sellers under this Agreement are subject to the
     fulfillment, at the Closing Date, of the following conditions precedent,
     each of which is hereby acknowledged to have been satisfied or waived.

11.1 Corporate Proceedings.

     All corporate and other proceedings required to be taken on the part of the
     Acquirer to authorize or carry out this Agreement and the transactions
     contemplated hereby have been taken.

11.2 Governmental Approvals.

     All governmental agencies, departments, bureaus, commissions and similar
     bodies, the consent, authorization or approval of which is necessary under
     any applicable law, rule, order or regulation for the consummation by the
     Acquirer of the transactions contemplated by this Agreement have consented
     to, authorized, permitted or approved such transactions including, without
     limitation, the approvals set forth in Schedule 7.3 hereof.
                                            ------------        

11.3 Consents of Third Parties.

     The Acquirer has received all requisite consents and approvals of all
     lenders, lessors and other third parties whose consent or approval is
     required in order for the Acquirer to consummate the transactions
     contemplated by this Agreement including, without limitation, the consents
     set forth on Schedule 7.4 hereof.
                  ------------        
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 30

11.4 Employment Agreements.

     csd has executed the Employment Agreements with each of Mr. Heiter, Mr. von
     Ruxleben and Mr. Moller.

11.5 Registration Rights Agreement.

     ON has executed the Registration Rights Agreement with the Sellers.

11.6 Closing Deliveries.

     The Sellers have received at or prior to the Closing such documents,
     instruments or certificates as the Sellers may reasonably request
     including, without limitation, a fully executed Escrow Agreement.

12.  DISPUTE RESOLUTION

12.1 General

     In the event that any dispute should arise between the parties hereto with
     respect to any matter covered by this Agreement, the parties hereto shall
     resolve such dispute solely by agreement or arbitration in accordance with
     the procedures set forth in this Sec. 12.

12.2 Consent of the Parties

     In the event of any dispute between the parties with respect to any matter
     covered by this Agreement, the parties shall first use their best efforts
     to resolve such dispute among themselves.  If the parties are unable to
     resolve the dispute within 30 calendar days after the commencement of
     efforts to resolve the dispute, the dispute will be submitted to
     arbitration in accordance with this Sec. 12.
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 31

12.3 Arbitration

     (i)  Either the Acquirer or the Sellers (acting upon the consent of the
          Seller holding a majority of the Shares who shall have the authority
          to bind all the Sellers) may submit any matter referred to in Sec.
          12.1 hereof to arbitration by notifying the other parties hereto, in
          writing, of such dispute.  Within 10 days after receipt of such
          notice, the Acquirer and the Seller shall designate in writing one
          arbitrator to resolve the dispute; provided, that if the parties
          hereto cannot agree on an arbitrator within such 10-day period, the
          arbitrator shall be selected by the President of the IHK for Munich
          and Upper Bavaria.  The arbitrator so designated shall not be an
          employee, consultant, officer, director or stockholder of any party
          hereto or any Affiliate of any party to this Agreement.

     (ii) Within 15 days after the designation of the arbitrator, the
          arbitrator, the Acquirer and the Sellers shall meet, at which time the
          Acquirer and the Sellers shall be required to set forth in writing all
          disputed issues and a proposed ruling on each such issue.

   (iii)  The arbitrator shall set a date for a hearing, which shall be no
          later than 30 days after the submission of written proposals pursuant
          to paragraph (b) above, to discuss each of the issues identified by
          the Acquirer and the Sellers.  Each such party shall have the right to
          be represented by counsel.  The arbitration shall be governed by the
          rules of the International Chamber of Commerce; provided, that the
          arbitrator shall have sole discretion with regard to the admissibility
          of evidence.  The hearings shall be conducted in English.

     (iv) The arbitrator shall use his best efforts to rule on each disputed
          issue within 30 days after the completion of the hearings described in
          paragraph (c) above.  The determination of the arbitrator as to the
          resolution of any dispute shall be binding and conclusive upon all
          parties hereto.  All rulings of the arbitrator shall be in writing and
          shall be delivered to the parties hereto.

     (v)  The arbitrator may, in his or her discretion, award attorneys' fees
          and expenses in connection with the arbitration determination, but may
          not award punitive damages.

     (vi) Any arbitration pursuant to this Sec. 12 shall be conducted in Munich,
          Germany.  Any arbitration award may be entered in and enforced by any
          court having jurisdiction thereover and the parties hereby consent and
          
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 32

     commit themselves to the jurisdiction of the courts of Germany for
     purposes of the enforcement of any arbitration award. 

13.  CONFIDENTIALITY

13.1 All information not previously disclosed to the public or generally known
     to the persons engaged in the respective businesses of Acquirer or csd
     which shall have been furnished by Acquirer, csd or Sellers to any other
     party in connection with the transactions contemplated hereby shall not be
     disclosed to any other person other than their respective employees,
     directors, attorneys, accountants or financial advisors or other than as
     contemplated herein.

13.2 Except as otherwise required by law, the parties agree that any and all
     general public pronouncements or other general public communications
     concerning this Agreement and the purchase and sale of the Shares by the
     Acquirer, and the timing, manner and content of such disclosures, shall be
     subject to the mutual agreement of Mr. Heiter, Mr. von Ruxleben and the
     Acquirer; provided, however, that the Acquirer's U.S. Parent, may, without
               --------  -------                                               
     the agreement of Mr. Heiter or Mr. von Ruxleben, make any such disclosures
     that it is required to make as a result of its status as a reporting
     company under the Securities Exchange Act of 1934, as amended, or as a
     listed company on the Nasdaq National Market, Inc.

14.  NON-COMPETITION

14.1 In consideration of the Purchase Price and the other benefits afforded by
     this Agreement, each of Mr. Heiter, Mrs. Heiter, Mr. von Ruxleben, Mrs. von
     Ruxleben and Mr. Moller (each, a "Covered Seller") hereby agrees that until
     the third anniversary of the date hereof (the "Prohibition Period"), the
     Covered Seller will not, without the Acquirer's or csd's prior written
     approval, directly or indirectly:

     (a)  recruit, solicit or knowingly induce, or attempt to induce, any
          employee or consultant of csd to terminate his employment or
          consulting relationship with, or otherwise cease his relationship
          with, csd;

     (b)  solicit, divert or take away, or attempt to do so, the business or
          patronage of any of the clients, customers or accounts, or prospective
          clients, customers or accounts, of csd (defined, for purposes hereof,
          as any individual or entity whose business is solicited by csd,
          proposed to be solicited by csd, or who approaches csd, with respect
          to possibly becoming a client, customer, or account); or
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 33

     (c)  directly or indirectly engage (with or without compensation) as an
          individual proprietor, partner, stockholder, officer, employee,
          director, joint venturer, investor, lender, or in any other capacity
          whatsoever (other than as the holder of not more than one percent (1%)
          of the total outstanding stock of a publicly-held company), in any
          business activity within Europe or the United States that involves or
          relates to the network application management market, or any other
          area of business in which csd is involved.

14.2 Each Covered Seller shall keep csd informed during the Restriction Period
     of the nature and extent of all his earnings from all employers, including
     bonuses, gratuities and annual payments, whether or not granted under a
     legal claim, other variable receipts, etc., and including any payments made
     after the expiry of the restriction period, but that were earned during the
     same.

14.3 Each Covered Seller shall be liable to pay csd liquidated damages of DM
     30,000 for any isolated breach of the restrictions set forth in this Sec.
     or, if such a breach is continuing, such amount at the beginning of each
     month that the breach has continued.

14.4 If any restriction set forth in this Sec. 14 is found by any court of
     competent jurisdiction to be unenforceable because it covers too long a
     period of time, too great a range of activities, or too broad a geographic
     area, it shall be narrowed to cover the maximum period of time, range of
     activities or geographic areas that may be enforceable.

14.5 Each Covered Seller acknowledges that the restrictions contained in this
     Sec. 14 are necessary for the protection of the business and goodwill of
     csd and are considered by csd to be reasonable for this purpose.  Each
     Covered Seller agrees that any breach of this Sec. 14 will cause csd
     substantial and irrevocable damage and, therefore, in the event of any such
     breach, in addition to such other remedies which may be available, csd will
     have the right to seek specific performance and injunctive relief.


15.  MISCELLANEOUS

15.1 The notary's fees accruing from this Agreement, as well as the fees and
     expenses charged by an governmental authorities (including antitrust
     bodies) in connection with this Agreement shall be borne by Acquirer.
     Apart therefrom each party shall bear its own cost and the fees and costs
     of its own advisors, including without limitation, consultants, investment
     brokers and other financial advisers, counsel and accountants.
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 34

15.2 All parties mutually consent to the sale and the transfer of all shares in
     csd to the Acquirer, even if the assigning Seller is lacking title to the
     sold shares.

15.3 This Agreement constitutes the complete and entire agreement between the
     Sellers on the one hand and the Acquirer on the other hand, regarding the
     transactions contemplated herein, and supersedes all previous agreements,
     whether written or oral. Changes and amendments to, and interpretations of,
     this Agreement as well as notices and declarations to be given or other
     communications to be made pursuant to this Agreement shall be valid only if
     made in writing unless a notarial deed is legally required.  This shall
     also apply to any changes to this Subsec. 15.3.

15.4 If a provision of this Agreement is or becomes invalid or unenforceable the
     validity and enforceability of the other provisions hereof shall not be
     affected thereby.  The invalid or unenforceable provision shall be replaced
     by a legally valid and enforceable arrangement which corresponds as closely
     as possible to the intentions of the parties.

15.5 The Schedules (but not the Exhibits) to this Agreement form an integral
     part hereof.  Statements in one provision of, or Schedule to, this
     Agreement shall be deemed to have been made also for the purposes of all
     other provisions of and Schedules to this Agreement.

15.6 Every notice under or in connection with this Agreement shall be given in
     writing and must be delivered personally or sent by registered mail, return
     receipt requested or by telecopier to the recipient at the following
     addresses (or to such address as may be notified by like notice):


     If to Sellers:      to the respective addresses
                         of each of the Sellers set
                         forth on Schedule 15.6
                                  -------------

     with a copy to:    Dr. Uwe H. Steininger
                         Dissman & Partners
                         Kardinal-Fauchaber-Str. 14A
                         D-80333 Munchen
                         Germany

     with a copy to:    David Walek, Esq.
                         Ropes & Gray
                         One International Place
                         Boston, MA  02110
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 35

     If to Acquirer:     c/o ON Technology Corporation
                         One Cambridge Center
                         Cambridge, MA   02142
                         Attention:  Christopher A. Risley

     with a copy to:    Gabor Garai, Esq.
                         Epstein Becker & Green, P.C.
                         75 State Street
                         Boston, MA   02109


15.7   Any assignment of rights and obligations under this Agreement requires
       consent of all Parties.

15.8   This Agreement shall be governed by the laws of the Federal Republic of
       Germany.

15.9   The place of jurisdiction shall be Munich.

15.10  Certified copies of this deed shall be sent to
       -    all parties of this Agreement
       -    csd as notification according to sec. 16 GmbHG
       -    the tax authority in charge
       -    Dissmann & Partner, Kardinal-Faulhaber-Str. 14A, 80333 Munchen,
       -    Oppenhoff & Radler, Prinzregentenpl. 10,81675, Munchen,
       -    Ropes & Gray, One International Place, Boston, MA 02110,
       -    Epstein Becker & Green, P.C., 75 State Street, Boston, MA 02109.

15.11  ON Technology Corporation hereby consents to the Acquirer entering into
       this Agreement and hereby guarantees full and timely payment and
       performance of the obligations of the Acquirer set forth in Sections 6.2
       and 6.3 of this Agreement and consents to Section 12 of this Agreement.

Nach Uberzeugung des beurkundenden Notars und nach Bestatigung aller
unterzeichneten Urkundsbeteiligten sind diese der englischen Sprache hinreichend
kundig.  Die Zuziehung eines Dolmetschers ist deshalb nicht erforderlich.

Read by the Notary, with all Exhibits, (the Exhibits K1-K3 are attached only for
the purpose of proof) and Schedules (regarding Schedule 4.3.1 Anlage I und II
only), approved by the persons appearing and signed by them and the Notary as
follows:

                         WILMA 96 VERMOGENSVERWALTUNGS GMBH
<PAGE>

PURCHASE AGREEMENT                                                   PAGE 36


                         By: /s/ Christopher M. Huggett
                            __________________________________________
                             Christopher M. Huggett, Managing Director

                         /s/ Eugen Heiter    
                         _____________________________________________
                         Eugen Heiter

                         /s/Iska Heiter    
                         _____________________________________________
                         Iska Heiter

                         /s/ Hans-Till Freiherr von Ruxleben
                         _____________________________________________
                         Hans-Till Freiherr von Ruxleben

                         /s/ Liliane Freifrau von Ruxleben   
                         _____________________________________________
                         Liliane Freifrau von Ruxleben

                         /s/ Harald Moller
                         _____________________________________________
                         Harald Moller

                         /s/ Reinhold Weber
                         _____________________________________________
                         Reinhold Weber

                         /s/ Jochen Tschunke 
                         _____________________________________________
                         Prof. Jochen Tschunke


     ON Technology Corporation hereby consents to the Acquirer entering into
this Agreement and hereby guarantees full and timely payment and performance of
the obligations of the Acquirer set forth in Sections 6.2 and 6.3 of this
Agreement.

                         ON Technology Corporation


                         By: /s/ Christopher M. Huggett
                            ________________________________________
                             Christopher M. Huggett, Attorney in Fact


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