ISOCOR
S-8, 1996-06-05
PREPACKAGED SOFTWARE
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<PAGE>   1
This Document consists of 39 pages, of which this page is Number 1. The Index to
Exhibits is on Page 10.
           As filed with the Securities and Exchange Commission on June 5, 1996.
                                                   Registration No. 333-

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

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                    FORM S-8

                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933

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

                                     ISOCOR

             (Exact name of Registrant as specified in its charter)

<TABLE>
<S>                                                               <C>       
                       CALIFORNIA                                              95-4310259
(State or Other Jurisdiction of Incorporation or Organization)    (I.R.S. Employer Identification No.)
</TABLE>

                            3420 Ocean Park Boulevard
                         Santa Monica, California 90405
                    (Address of principal executive offices)

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

                        1996 DIRECTORS' STOCK OPTION PLAN
                        1996 EMPLOYEE STOCK PURCHASE PLAN
                             1992 STOCK OPTION PLAN
                            (Full title of the Plans)

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

                                 Andrew De Mari
                      President and Chief Executive Officer
                                     ISOCOR
                            3420 Ocean Park Boulevard
                         Santa Monica, California 90405
                                 (310) 581-8100
            (Name, address and telephone number of agent for service)

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

                                   Copies to:
                              ELIAS J. BLAWIE, ESQ.
                              LAURA A. GORDON, ESQ.
                              SANJAY K. KHARE, ESQ.
                                Venture Law Group
                           A Professional Corporation
                               2800 Sand Hill Road
                          Menlo Park, California 94025
                                 (415) 854-4488
<PAGE>   2
- --------------------------------------------------------------------------------

                         CALCULATION OF REGISTRATION FEE

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

<TABLE>
<CAPTION>
                                                    
                                                       Proposed      
                                                       Maximum       Proposed Maximum    Amount of
  Title of Securities to       Maximum Amount to    Offering Price  Aggregate Offering  Registration 
      be Registered             be Registered         Per Share           Price              Fee
<S>                           <C>                   <C>             <C>                 <C>  
Common Stock,
     no par value..........   1,288,965 shares (1)     $2.68 (2)     $3,454,426.20 (3)    $1,191.18

Common Stock,
     no par value..........     582,305 shares (4)    $18.13 (5)    $10,554,278.13        $3,639.41

Common Stock,
     no par value..........     250,000 shares (6)    $15.41 (7)     $3,851,562.50        $1,328.13

TOTAL                         2,121,270 shares                      $17,860,266.83        $6,158.71
</TABLE>

(1)   For the sole purpose of calculating the registration fee, the number of
      shares issuable under the 1996 Directors' Stock Option Plan and the 1992
      Stock Option Plan which are to be registered under this Registration
      Statement has been broken down into two subtotals (see note 4 below). This
      sub-total represents the sum of shares issuable upon exercise of presently
      outstanding options (options that have been granted as of the date of this
      Registration Statement) issued under the 1996 Directors' Stock Option Plan
      and the 1992 Stock Option Plan. Of the total 1,288,965 shares issuable,
      40,000 shares are issuable upon exercise of options outstanding under the
      1996 Directors' Stock Option Plan and 1,248,965 shares are issuable upon
      exercise of options outstanding under the 1992 Stock Option Plan.

(2)   Computed in accordance with Rule 457(h) under the Securities Act of 1933
      solely for the purpose of calculating the total registration fee.
      Computation based on the weighted average exercise price (rounded to
      nearest cent) of the options whose exercise will result in the issuance of
      the shares being registered.

(3)   Calculated in accordance with Rule 457(h) based on the aggregate exercise
      price for all presently outstanding options described in note 1 above.

(4)   This sub-total represents the sum of shares issuable upon exercise of
      options that have not yet been granted under the 1996 Directors' Stock
      Option Plan and the 1992 Stock Option Plan as of the date of this
      Registration Statement. Of the total of 582,305 shares that will be
      issuable upon the exercise of such options to be granted in the future,
      110,000 shares will be issuable upon exercise of options to be granted in
      the future under the 1996 Directors' Stock Option Plan and 

                                      -2-
<PAGE>   3
      472,305 shares will be issuable upon exercise of options to be granted in
      the future under the 1992 Stock Option Plan. See note 1, above.

(5)   Estimated in accordance with Rule 457(h) under the Securities Act of 1933
      solely for the purpose of calculating the total registration fee.
      Computation based upon the average of the high and low prices of the
      Common Stock as reported in the Nasdaq National Market on May 31, 1996
      because the price at which the options to be granted in the future may be
      exercised is not currently determinable.

(6)   This sub-total represents the number of shares authorized to be issued
      under the 1996 Employee Stock Purchase Plan.

(7)   Estimated in accordance with Rule 457(h) under the Securities Act of 1933
      solely for the purpose of calculating the total registration fee.
      Computation based upon 85% (see explanation in following sentence) of the
      average of the high and low prices of the Common Stock as reported in the
      Nasdaq National Market on May 31, 1996 because the price at which the
      shares will be issued in the future is not currently determinable.
      Pursuant to Section 7 of the 1996 Employee Stock Purchase Plan, a copy of
      which is incorporated by reference in this Registration Statement from the
      Registrant's Registration Statement No. 333-606 on Form S-1 filed with the
      Securities and Exchange Commission on January 24, 1996, such shares will
      be issued at 85% of their market value as of specified dates.

                                      -3-
<PAGE>   4
PART II: INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3   INFORMATION INCORPORATED BY REFERENCE

         The following documents and information heretofore filed with the
Securities and Exchange Commission are hereby incorporated by reference:

         ITEM 3 (a)

         The Registrant's Prospectus filed on March 14, 1996 pursuant to Rule
424(b)(4) of the Securities Act of 1933, as amended (the "Act"), which contains
audited financial statements for the Registrant's latest fiscal year for which
such statements have been filed.

         ITEM 3 (b)

         The Registrant's Quarterly Report on Form 10-Q filed on May 3, 1996
pursuant to Rule 15(d) of the Securities Exchange Act of 1934, as amended (the
"Exchange Act").

         ITEM 3 (c)

         Items 1 and 2 of the Registrant's Registration Statement on Form 8-A
filed on March 5, 1996 pursuant to Section 12 of the Exchange Act.

         All documents subsequently filed by the Registrant pursuant to Sections
13(a), 13(c), 14 and 15(d) of the Exchange Act, prior to the filing of a
post-effective amendment which indicates that all securities offered have been
sold or which deregisters all securities then remaining unsold, shall be deemed
to be incorporated by reference in this Registration Statement and to be part
hereof from the date of filing of such documents.

ITEM 4   DESCRIPTION OF SECURITIES

         Not Applicable.

ITEM 5   INTERESTS OF NAMED EXPERTS AND COUNSEL

         The validity of the Common Stock registered hereby is being passed upon
by Venture Law Group. a Professional Corporation. Certain members of Venture Law
Group, including Elias J. Blawie, Secretary of the Company, beneficially own, in
the aggregate, 8,310 shares of the Company's Common Stock.

ITEM 6   INDEMNIFICATION OF DIRECTORS AND OFFICERS

         The Company has adopted provisions in its Articles of Incorporation
that limit the liability of its directors for monetary damages arising from a
breach of their fiduciary duty as directors to the 

                                      -4-
<PAGE>   5
fullest extent permitted by the California Corporations Code. Such limitation of
liability does not affect the availability of equitable remedies such as
injunctive relief or recission.

         The Company's Bylaws provide that the Company shall indemnify its
directors and officers to the fullest extent permitted by California law,
including circumstances in which indemnification is otherwise discretionary
under California law. The Company has entered into indemnification agreements
with its directors and officers containing provisions which are, in some
respects, broader than the specific indemnification provisions contained in the
California Corporations Code. The indemnification agreements may require the
Company, among other things, to indemnify its directors and officers against
certain liabilities that may arise by reason of their status or service as
directors or officers (other than liabilities arising from willful misconduct of
a culpable nature), to advance their expenses as incurred as a result of any
proceeding against them as to which they could be indemnified and to obtain
directors' and officers' insurance, if available on reasonable terms.

         At present, there is no pending litigation or proceeding involving any
director, officer, employee or agent of the Company where indemnification would
be required or permitted. The Company is not aware of any threatened litigation
or proceeding which might result in a claim for such indemnification.

ITEM 7   EXEMPTION FROM REGISTRATION CLAIMED

         Not Applicable.

ITEM 8   EXHIBITS

<TABLE>
<CAPTION>
        Exhibit
        Number             Document
        ------             --------
<S>                        <C>                                                                 
          4.1              Articles of Incorporation of Registrant, as amended
                           to date.
          4.2              Bylaws of Registrant, as amended to date.
          4.3*             1996 Directors' Stock Option Plan and form of
                           option agreement for use with plan.
          4.4*             1996 Employee Stock Purchase Plan and form of
                           subscription agreement for use with plan.
          4.5*             1992 Stock Option Plan and forms of option
                           agreements for use with plan.
          5.1              Opinion of Counsel as to legality of securities
                           being registered.
         23.1              Consent of Counsel  (contained in Exhibit 5.1
                           hereto).
         23.2              Consent of Independent Accountants  (see page 8).
         24.1              Power of Attorney (see page 7).
</TABLE>

* Incorporated by reference to the Registrant's Registration Statement on Form
S-1 (File No. 333-606) as filed with the Securities and Exchange Commission on
January 25, 1996.

                                      -5-
<PAGE>   6
ITEM 9   UNDERTAKINGS

         A.       The undersigned Registrant hereby undertakes:

                  (1)      To file during any period in which offers or sales
are being made, a post-effective amendment to this Registration statement to
include any material information with respect to the plan of distribution not
previously disclosed in the Registration Statement or any material change to
such information in the Registration Statement.

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

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

         B.       The undersigned Registrant hereby undertakes that, for
purposes of determining any liability under the Act, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act (and where applicable each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Exchange Act) that is
incorporated by reference in the Registration Statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

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

                                      -6-
<PAGE>   7
                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
Registrant, ISOCOR, a corporation organized and existing under the laws of the
State of California, certifies that it has reasonable grounds to believe that it
meets all of the requirements for filing on Form S-8 and has duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of Santa Monica, State of California, on June 4,
1996.

                                          ISOCOR



                                          By:  /s/ Andrew De Mari
                                             -----------------------------------
                                               Andrew De Mari, President and
                                               Chief Executive Officer

                                POWER OF ATTORNEY

         KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Andrew De Mari and Janine M. Bushman,
jointly and severally, his or her attorneys-in-fact, each with the power of
substitution, for him or her in any and all capacities, to sign any amendments
to this Registration Statement on Form S-8, and to file the same, with exhibits
thereto and other documents in connection therewith, with the Securities and
Exchange Commission, hereby ratifying and confirming all that each of said
attorneys-in-fact, or his or her substitute or substitutes, may do or cause to
be done by virtue hereof.

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

<TABLE>
<CAPTION>
         Signature                            Title                        Date
- -----------------------------  --------------------------------------  ------------
<S>                            <C>                                     <C>
                               Chairman of the Board of Directors      June 4, 1996
- -----------------------------
     (Jean Paul Elkann)

     /s/ Andrew De Mari        President, Chief Executive Officer and  June 4, 1996
- -----------------------------  Director (Principal Executive Officer)
      (Andrew De Mari)         

                               
                               Vice President, Finance and      
   /s/ Janine M. Bushman       Administration, Chief Financial         June 4, 1996
- ----------------------------   Officer and Director (Principal  
    (Janine M. Bushman)        Financial and Accounting Officer)

                               Director                                June 4, 1996
- ----------------------------   
   (Jean Michel Barbier)

   /s/ Alexandra Giurgiu       Director                                June 4, 1996
- ----------------------------
    (Alexandra Giurgiu)

   /s/ G. Bradford Jones       Director                                June 4, 1996
- ----------------------------
    (G. Bradford Jones)
</TABLE>

                                      -7-
<PAGE>   8
                          INDEPENDENT AUDITORS' CONSENT

We consent to the incorporation by reference in the Registration Statement on
Form S-8 of our reports dated January 24, 1996, on our audits of the
consolidated financial statements of ISOCOR as of December 31, 1995 and 1994 and
for the years ended December 31, 1995, 1994 and 1993, which report appears in
Amendment No. 3 to ISOCOR's registration statement on Form S-1 (File No.
333-606) filed with the Securities and Exchange Commission pursuant to the
Securities Act of 1933.


/s/ Coopers & Lybrand L.L.P.
- ----------------------------


COOPERS & LYBRAND L.L.P.
Los Angeles, California
June 3, 1996

                                      -8-
<PAGE>   9
                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

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


                                    EXHIBITS


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

                       Registration Statement on Form S-8

                                     ISOCOR


                                  June 5, 1996
<PAGE>   10
                                INDEX TO EXHIBITS

<TABLE>
<CAPTION>
Exhibit                                                                               Page
Number                                                                                No.
- ------                                                                                ---
<S>        <C>                                                                        <C>
  4.1      Articles of Incorporation of Registrant, as amended to date.                11
  4.2      Bylaws of Registrant, as amended to date.                                   14
  4.3*     1996 Directors' Stock Option Plan and form of option
           agreement for use with plan.                                                NA
  4.4*     1996 Employee Stock Purchase Plan and form of
           subscription agreement for use with plan.                                   NA
  4.5*     1992 Stock Option Plan and forms of option agreements for use with plan.    NA
  5.1      Opinion of Counsel as to legality of securities being registered            39
 23.1      Consent of Counsel (contained in Exhibit 5.1 hereto).                       NA
 23.2      Consent of Independent Auditors (see page 8).                               NA
 24.1      Power of Attorney (see page 7).                                             NA
</TABLE>




* Incorporated by reference to the Registrant's Registration Statement on Form
S-1 (File No. 333-606) as filed with the Securities and Exchange Commission on
January 25, 1996.

<PAGE>   1

                                                                    EXHIBIT 4.1

                              AMENDED AND RESTATED

                          ARTICLES OF INCORPORATION OF

                                     ISOCOR

         Janine M. Bushman and Elias J. Blawie certify that:

         1.       They are the Vice President, Finance and Administration and
Secretary, respectively, of ISOCOR, a California corporation.

         2.       The Articles of Incorporation of this corporation are amended
and restated to read in their entirety as follows:

                                       "I.

         The name of this corporation is ISOCOR.

                                      II.

         The purpose of this corporation is to engage in any lawful act or
activity for which a corporation may be organized under the General Corporation
Law of California other than the banking business, the trust company business or
the practice of a profession permitted to be incorporated by the California
Corporations Code.

                                      III.

         Section 1. Two Classes of Stock. This corporation is authorized to
issue two classes of shares, designated "Preferred Stock" and "Common Stock,"
respectively. The total number of shares which this corporation shall have
authority to issue is Fifty-Two Million (52,000,000). The number of shares of
Preferred Stock authorized to be issued is Two Million (2,000,000), and the
number of shares of Common Stock authorized to be issued is Fifty Million
(50,000,000).

         Section 2. Authority of Board To Fix Rights, Preferences, etc. of
Preferred Stock. The Preferred Stock may be issued from time to time in one or
more series. The Board of Directors is hereby authorized, within the limitations
and restrictions stated in these Articles of Incorporation, to determine or
alter the rights, preferences, privileges and restrictions granted to or imposed
upon any wholly unissued series of Preferred Stock and the number of shares
constituting any such series and the designation thereof, or any of them; and to
increase or decrease the number of shares of any series subsequent to the issue
of shares of that series, but not below the number of shares of such series then
outstanding. In case the number of shares of any series shall be so decreased,
the shares constituting such decrease shall resume the status which they had
prior to the adoption of the resolution originally fixing the number of shares
of such series.
<PAGE>   2
                                       IV.

         Section 1. Limitation of Directors' Liability. The liability of the
directors of the corporation for monetary damages shall be eliminated to the
fullest extent permissible under California law.

         Section 2. Indemnification of Corporate Agents. The corporation is
authorized to provide indemnification of agents (as defined in Section 317 of
the California Corporations Code) through bylaw provisions, agreements with
agents, vote of shareholders or disinterested directors or otherwise, in excess
of the indemnification otherwise permitted by such Section 317 of the California
Corporations Code, subject only to the applicable limits set forth in Section
204 of the California Corporations Code with respect to actions for breach of
duty to the corporation and its shareholders.

         Section 3. Repeal or Modification. Any repeal or modification of the
foregoing provisions of this Article IV by the shareholders of the corporation
shall not adversely affect any right or protection of a director of the
corporation existing at the time of such repeal or modification.

                                       V.

         Section 1. Effectiveness. This Article V shall become effective only
when the corporation becomes a listed corporation within the meaning of Section
301.5 of the California Corporations Code, which provision refers to a
corporation whose shares are traded on the New York Stock Exchange, American
Stock Exchange or the Nasdaq National Market.

         Section 2. No Cumulative Voting. There shall be no right with respect
to shares of stock of the corporation to cumulate votes in the election of
directors.

                                       VI.

         Section 1. Action Without Meeting. Shareholders of the corporation may
not take any action by written consent in lieu of a meeting. This provision
shall supersede any provision to the contrary in the Bylaws of the corporation.

         Section 2. Advance Notice. Advance notice of new business and
shareholder nominations for the election of directors shall be given in the
manner and to the extent provided in the Bylaws of the corporation."

         3.       The foregoing Amended and Restated Articles of Incorporation
have been duly approved by the Board of Directors.

                                      -2-
<PAGE>   3
         4.       The foregoing Amended and Restated Articles of Incorporation
have been duly approved by the required vote of shareholders in accordance with
Sections 902 and 903 of the Code. The total number of outstanding shares of the
corporation is 1,186,967 shares of Common Stock, 1,875,000 shares of Series A
Preferred Stock, 2,066,655 shares of Series B Preferred Stock, 857,142 shares of
Series C Preferred Stock and 150,000 shares of Series D Preferred Stock. The
number of shares voting in favor of the amendment equaled or exceeded the vote
required. The percentage vote required was more than 50% of the Common Stock,
more than 50% of the Preferred Stock, more than 50% of the outstanding Series C
Preferred Stock voting separately as a class, more than 50% of the Series D
Preferred Stock voting separately as a class and more than 50% of the Common
Stock and Preferred Stock voting together as a class. Subsequent to the
shareholder vote, all outstanding shares of Preferred Stock of all series were
converted to Common Stock and no shares of Preferred Stock remained outstanding.

         We further declare under penalty of perjury under the laws of the State
of California that the matters set forth in these Amended and Restated Articles
of Incorporation are true of our own knowledge. Executed at Menlo Park,
California on March 14, 1996.

                                                 /s/ Janine M. Bushman
                                      ------------------------------------------
                                      Janine M. Bushman,
                                      Vice President, Finance and Administration

                                                 /s/ Elias J. Blawie
                                      ------------------------------------------
                                      Elias J. Blawie,
                                      Secretary

                                      -3-

<PAGE>   1

                                                                    EXHIBIT 4.2

                           AMENDED AND RESTATED BYLAWS

                                       OF

                                     ISOCOR
<PAGE>   2
                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                       PAGE NO.
                                                                                       --------
<S>                                                                                    <C>
ARTICLE I  CORPORATE OFFICES.........................................................     1
                                                                                          
         1.1      PRINCIPAL OFFICE...................................................     1
         1.2      OTHER OFFICES......................................................     1
                                                                                          
ARTICLE II  MEETINGS OF SHAREHOLDERS.................................................     1
                                                                                          
         2.1      PLACE OF MEETINGS..................................................     1
         2.2      ANNUAL MEETING.....................................................     1
         2.3      SPECIAL MEETING....................................................     1
         2.4      NOTICE OF SHAREHOLDERS' MEETINGS...................................     2
         2.5      MANNER OF GIVING NOTICE; AFFIDAVIT OF NOTICE.......................     2
         2.6      QUORUM.............................................................     3
         2.7      ADJOURNED MEETING; NOTICE..........................................     3
         2.8      VOTING.............................................................     4
         2.9      VALIDATION OF MEETINGS; WAIVER OF NOTICE; CONSENT..................     4
         2.10     RECORD DATE FOR SHAREHOLDER NOTICE; VOTING.........................     5
         2.11     PROXIES............................................................     5
         2.12     INSPECTORS OF ELECTION.............................................     6
         2.13     ADVANCE NOTICE OF SHAREHOLDER NOMINEES.............................     6
         2.14     ADVANCE NOTICE OF SHAREHOLDER BUSINESS.............................     7
                                                                                          
ARTICLE III  DIRECTORS...............................................................     8
                                                                                          
         3.1      POWERS.............................................................     8
         3.2      NUMBER OF DIRECTORS................................................     8
         3.3      ELECTION AND TERM OF OFFICE OF DIRECTORS...........................     8
         3.4      RESIGNATION AND VACANCIES..........................................     8
         3.5      PLACE OF MEETINGS; MEETINGS BY TELEPHONE...........................     9
         3.6      REGULAR MEETINGS...................................................     9
         3.7      SPECIAL MEETINGS; NOTICE...........................................     9
         3.8      QUORUM.............................................................     10
         3.9      WAIVER OF NOTICE...................................................     10
         3.10     ADJOURNMENT........................................................     10
         3.11     NOTICE OF ADJOURNMENT..............................................     10
         3.12     BOARD ACTION BY WRITTEN CONSENT                                         
                  WITHOUT A MEETING..................................................     11
         3.13     FEES AND COMPENSATION OF DIRECTORS.................................     11
         3.14     APPROVAL OF LOANS TO OFFICERS......................................     11
                                                                                          
ARTICLE IV  COMMITTEES...............................................................     11
                                                                                          
         4.1      COMMITTEES OF DIRECTORS............................................     11
         4.2      MEETINGS AND ACTION OF COMMITTEES..................................     12
                                                                                          
ARTICLE V  OFFICERS..................................................................     12
                                                                                          
         5.1      OFFICERS...........................................................     12
</TABLE>
<PAGE>   3
<TABLE>
<S>                                                                                       <C>
         5.2      ELECTION OF OFFICERS...............................................     13
         5.3      SUBORDINATE OFFICERS...............................................     13
         5.4      REMOVAL AND RESIGNATION OF OFFICERS................................     13
         5.5      VACANCIES IN OFFICES...............................................     13
         5.6      CHAIRMAN OF THE BOARD..............................................     13
         5.7      PRESIDENT..........................................................     13
         5.8      VICE PRESIDENTS....................................................     14
         5.9      SECRETARY..........................................................     14
         5.10     CHIEF FINANCIAL OFFICER............................................     14
                                                                                          
ARTICLE VI  INDEMNIFICATION OF DIRECTORS, OFFICERS, EMPLOYEES  AND OTHER AGENTS......     15
                                                                                          
         6.1      INDEMNIFICATION OF DIRECTORS AND OFFICERS..........................     15
         6.2      INDEMNIFICATION OF OTHERS..........................................     15
         6.3      PAYMENT OF EXPENSES IN ADVANCE.....................................     15
         6.4      INDEMNITY NOT EXCLUSIVE............................................     16
         6.5      INSURANCE INDEMNIFICATION..........................................     16
         6.6      CONFLICTS..........................................................     16
                                                                                          
ARTICLE VII  RECORDS AND REPORTS.....................................................     16
                                                                                          
         7.1      MAINTENANCE AND INSPECTION OF SHARE REGISTER.......................     16
         7.2      MAINTENANCE AND INSPECTION OF BYLAWS...............................     17
         7.3      MAINTENANCE AND INSPECTION OF OTHER CORPORATE RECORDS..............     17
         7.4      INSPECTION BY DIRECTORS............................................     17
         7.5      ANNUAL REPORT TO SHAREHOLDERS; WAIVER..............................     18
         7.6      FINANCIAL STATEMENTS...............................................     18
         7.7      REPRESENTATION OF SHARES OF OTHER CORPORATIONS.....................     19
                                                                                          
ARTICLE VIII  GENERAL MATTERS........................................................     19
                                                                                          
         8.1      RECORD DATE FOR PURPOSES OTHER THAN NOTICE AND VOTING..............     19
         8.2      CHECKS; DRAFTS; EVIDENCES OF INDEBTEDNESS..........................     19
         8.3      CORPORATE CONTRACTS AND INSTRUMENTS:  HOW EXECUTED.................     19
         8.4      CERTIFICATES FOR SHARES............................................     20
         8.5      LOST CERTIFICATES..................................................     20
         8.6      CONSTRUCTION; DEFINITIONS..........................................     20
                                                                                          
ARTICLE IX  AMENDMENTS...............................................................     20
                                                                                          
         9.1      AMENDMENT BY SHAREHOLDERS..........................................     20
         9.2      AMENDMENT BY DIRECTORS.............................................     21
</TABLE>

                                      -ii-
<PAGE>   4
                              AMENDED AND RESTATED

                                    BYLAWS OF

                                     ISOCOR


                                    ARTICLE I

                                CORPORATE OFFICES

         1.1      PRINCIPAL OFFICE

         The board of directors shall fix the location of the principal
executive office of the corporation at any place within or outside the State of
California. If the principal executive office is located outside such state and
the corporation has one or more business offices in such state, then the board
of directors shall fix and designate a principal business office in the State of
California.

         1.2      OTHER OFFICES

         The board of directors may at any time establish branch or subordinate
offices at any place or places where the corporation is qualified to do
business.

                                   ARTICLE II

                            MEETINGS OF SHAREHOLDERS

         2.1      PLACE OF MEETINGS

         Meetings of shareholders shall be held at any place within or outside
the State of California designated by the board of directors. In the absence of
any such designation, shareholders' meetings shall be held at the principal
executive office of the corporation.

         2.2      ANNUAL MEETING

         The annual meeting of shareholders shall be held each year on a date
and at a time designated by the board of directors. In the absence of such
designation, the annual meeting of shareholders shall be held on the first
Wednesday of May in each year at 10:00 a.m. However, if such day falls on a
legal holiday, then the meeting shall be held at the same time and place on the
next succeeding full business day. At the meeting, directors shall be elected,
and any other proper business may be transacted.

         2.3      SPECIAL MEETING
<PAGE>   5
         A special meeting of the shareholders may be called at any time by the
board of directors, or by the chairman of the board, or by the president, or by
one or more shareholders holding shares in the aggregate entitled to cast not
less than ten percent (10%) of the votes at that meeting.

         If a special meeting is called by any person or persons other than the
board of directors or the president or the chairman of the board, then the
request shall be in writing, specifying the time of such meeting and the general
nature of the business proposed to be transacted, and shall be delivered
personally or sent by registered mail or by telegraphic or other facsimile
transmission to the chairman of the board, the president, any vice president or
the secretary of the corporation. The officer receiving the request shall cause
notice to be promptly given to the shareholders entitled to vote, in accordance
with the provisions of Sections 2.4 and 2.5 of these bylaws, that a meeting will
be held at the time requested by the person or persons calling the meeting, so
long as that time is not less than thirty-five (35) nor more than sixty (60)
days after the receipt of the request. If the notice is not given within twenty
(20) days after receipt of the request, then the person or persons requesting
the meeting may give the notice. Nothing contained in this paragraph of this
Section 2.3 shall be construed as limiting, fixing or affecting the time when a
meeting of shareholders called by action of the board of directors may be held.

         2.4      NOTICE OF SHAREHOLDERS' MEETINGS

         All notices of meetings of shareholders shall be sent or otherwise
given in accordance with Section 2.5 of these bylaws not less than ten (10) (or,
if sent by third-class mail pursuant to Section 2.5 of these bylaws, thirty
(30)) nor more than sixty (60) days before the date of the meeting. The notice
shall specify the place, date and hour of the meeting and (i) in the case of a
special meeting, the general nature of the business to be transacted (no
business other than that specified in the notice may be transacted) or (ii) in
the case of the annual meeting, those matters which the board of directors, at
the time of giving the notice, intends to present for action by the shareholders
(but subject to the provisions of the next paragraph of this Section 2.4, action
may be taken on any matter properly brought before the meeting pursuant to
Section 2.14 of these bylaws). The notice of any meeting at which directors are
to be elected shall include the name of any nominee or nominees who, at the time
of the notice, the board intends to present for election.

         If action is proposed to be taken at any meeting for approval of (i) a
contract or transaction in which a director has a direct or indirect financial
interest, pursuant to Section 310 of the Corporations Code of California (the
"Code"), (ii) an amendment of the articles of incorporation, pursuant to Section
902 of the Code, (iii) a reorganization of the corporation, pursuant to Section
1201 of the Code, (iv) a voluntary dissolution of the corporation, pursuant to
Section 1900 of the Code, or (v) a distribution in dissolution other than in
accordance with the rights of outstanding preferred shares, pursuant to Section
2007 of the Code, then the notice shall also state the general nature of that
proposal.

         2.5      MANNER OF GIVING NOTICE; AFFIDAVIT OF NOTICE

         Written notice of any meeting of shareholders shall be given either (i)
personally or (ii) by first-class mail or (iii) by third-class mail but only if
the corporation has outstanding shares held of 

                                      -2-
<PAGE>   6
record by five hundred (500) or more persons (determined as provided in Section
605 of the Code) on the record date for the shareholders' meeting, or (iv) by
telegraphic or other written communication. Notices not personally delivered
shall be sent charges prepaid and shall be addressed to the shareholder at the
address of that shareholder appearing on the books of the corporation or given
by the shareholder to the corporation for the purpose of notice. If no such
address appears on the corporation's books or is given, notice shall be deemed
to have been given if sent to that shareholder by mail or telegraphic or other
written communication to the corporation's principal executive office, or if
published at least once in a newspaper of general circulation in the county
where that office is located. Notice shall be deemed to have been given at the
time when delivered personally or deposited in the mail or sent by telegram or
other means of written communication.

         If any notice addressed to a shareholder at the address of that
shareholder appearing on the books of the corporation is returned to the
corporation by the United States Postal Service marked to indicate that the
United States Postal Service is unable to deliver the notice to the shareholder
at that address, then all future notices or reports shall be deemed to have been
duly given without further mailing if the same shall be available to the
shareholder on written demand of the shareholder at the principal executive
office of the corporation for a period of one (1) year from the date of the
giving of the notice.

         An affidavit of the mailing or other means of giving any notice of any
shareholders' meeting, executed by the secretary, assistant secretary or any
transfer agent of the corporation giving the notice, shall be prima facie
evidence of the giving of such notice.

         2.6      QUORUM

         The presence in person or by proxy of the holders of a majority of the
shares entitled to vote thereat constitutes a quorum for the transaction of
business at all meetings of shareholders. The shareholders present at a duly
called or held meeting at which a quorum is present may continue to do business
until adjournment, notwithstanding the withdrawal of enough shareholders to
leave less than a quorum, if any action taken (other than adjournment) is
approved by at least a majority of the shares required to constitute a quorum.

         2.7      ADJOURNED MEETING; NOTICE

         Any shareholders' meeting, annual or special, whether or not a quorum
is present, may be adjourned from time to time by the vote of the majority of
the shares represented at that meeting, either in person or by proxy. In the
absence of a quorum, no other business may be transacted at that meeting except
as provided in Section 2.6 of these bylaws.

         When any meeting of shareholders, either annual or special, is
adjourned to another time or place, notice need not be given of the adjourned
meeting if the time and place are announced at the meeting at which the
adjournment is taken. However, if a new record date for the adjourned meeting is
fixed or if the adjournment is for more than forty-five (45) days from the date
set for the original meeting, then notice of the adjourned meeting shall be
given. Notice of any such adjourned meeting shall be given to each shareholder
of record entitled to vote at the adjourned 

                                      -3-
<PAGE>   7
meeting in accordance with the provisions of Sections 2.4 and 2.5 of these
bylaws. At any adjourned meeting the corporation may transact any business which
might have been transacted at the original meeting.

         2.8      VOTING VOTING

         The shareholders entitled to vote at any meeting of shareholders shall
be determined in accordance with the provisions of Section 2.11 of these bylaws,
subject to the provisions of Sections 702 through 704 of the Code (relating to
voting shares held by a fiduciary, in the name of a corporation or in joint
ownership).

         The shareholders' vote may be by voice vote or by ballot; provided,
however, that any election for directors must be by ballot if demanded by any
shareholder at the meeting and before the voting has begun.

         Except as provided in the last paragraph of this Section 2.8, or as may
be otherwise provided in the articles of incorporation, each outstanding share,
regardless of class, shall be entitled to one vote on each matter submitted to a
vote of the shareholders. Any shareholder entitled to vote on any matter may
vote part of the shares in favor of the proposal and refrain from voting the
remaining shares or, except when the matter is the election of directors, may
vote them against the proposal; but, if the shareholder fails to specify the
number of shares which the shareholder is voting affirmatively, it will be
conclusively presumed that the shareholder's approving vote is with respect to
all shares which the shareholder is entitled to vote.

         If a quorum is present, the affirmative vote of the majority of the
shares represented and voting at a duly held meeting (which shares voting
affirmatively also constitute at least a majority of the required quorum) shall
be the act of the shareholders, unless the vote of a greater number or a vote by
classes is required by the Code or by the articles of incorporation.

         So long as the corporation's articles of incorporation so provide,
there shall be no right with respect to shares of stock of the corporation to
cumulate votes in the election of directors. The foregoing provision shall
become effective only when the corporation becomes a listed corporation within
the meaning of Section 301.5 of the Code which provision refers to a corporation
whose shares are traded on the New York Stock Exchange, American Stock Exchange
or the Nasdaq National Market.

         2.9      VALIDATION OF MEETINGS; WAIVER OF NOTICE; CONSENT

         The transactions of any meeting of shareholders, either annual or
special, however called and noticed, and wherever held, shall be as valid as
though they had been taken at a meeting duly held after regular call and notice,
if a quorum be present either in person or by proxy, and if, either before or
after the meeting, each person entitled to vote, who was not present in person
or by proxy, signs a written waiver of notice or a consent to the holding of the
meeting or an approval of the minutes thereof. The waiver of notice or consent
or approval need not specify either the business to be transacted or the purpose
of any annual or special meeting of shareholders, except that if action is taken
or proposed to be taken for approval of any of those matters specified in the

                                      -4-
<PAGE>   8
second paragraph of Section 2.4 of these bylaws, the waiver of notice or consent
or approval shall state the general nature of the proposal. All such waivers,
consents and approvals shall be filed with the corporate records or made a part
of the minutes of the meeting.

         Attendance by a person at a meeting shall also constitute a waiver of
notice of and presence at that meeting, except when the person objects at the
beginning of the meeting to the transaction of any business because the meeting
is not lawfully called or convened. Attendance at a meeting is not a waiver of
any right to object to the consideration of matters required by the Code to be
included in the notice of the meeting but not so included, if that objection is
expressly made at the meeting.

         2.10     RECORD DATE FOR SHAREHOLDER NOTICE; VOTING

         For purposes of determining the shareholders entitled to notice of any
meeting or to vote thereat or entitled to give consent to corporate action
without a meeting, the board of directors may fix, in advance, a record date,
which shall not be more than sixty (60) days nor less than ten (10) days before
the date of any such meeting, and in such event only shareholders of record on
the date so fixed are entitled to notice and to vote, notwithstanding any
transfer of any shares on the books of the corporation after the record date,
except as otherwise provided in the Code. If the board of directors does not so
fix a record date, the record date for determining shareholders entitled to
notice of or to vote at a meeting of shareholders shall be at the close of
business on the business day next preceding the day on which notice is given or,
if notice is waived, at the close of business on the business day next preceding
the day on which the meeting is held. The record date for any other purpose
shall be as provided in Article VIII of these bylaws.

         2.11     PROXIES

         Every person entitled to vote for directors, or on any other matter,
shall have the right to do so either in person or by one or more agents
authorized by a written proxy signed by the person and filed with the secretary
of the corporation. A proxy shall be deemed signed if the shareholder's name is
placed on the proxy (whether by manual signature, typewriting, telegraphic
transmission or otherwise) by the shareholder or the shareholder's
attorney-in-fact. A validly executed proxy which does not state that it is
irrevocable shall continue in full force and effect unless (i) the person who
executed the proxy revokes it prior to the time of voting by delivering a
writing to the corporation stating that the proxy is revoked or by executing a
subsequent proxy and presenting it to the meeting or by voting in person at the
meeting, or (ii) written notice of the death or incapacity of the maker of that
proxy is received by the corporation before the vote pursuant to that proxy is
counted; provided, however, that no proxy shall be valid after the expiration of
eleven (11) months from the date of the proxy, unless otherwise provided in the
proxy. The dates contained on the forms of proxy presumptively determine the
order of execution, regardless of the postmark dates on the envelopes in which
they are mailed. The revocability of a proxy that states on its face that it is
irrevocable shall be governed by the provisions of Sections 705(e) and 705(f) of
the Code.

                                      -5-
<PAGE>   9
         2.12     INSPECTORS OF ELECTION

         Before any meeting of shareholders, the board of directors may appoint
an inspector or inspectors of election to act at the meeting or its adjournment.
If no inspector of election is so appointed, then the chairman of the meeting
may, and on the request of any shareholder or a shareholder's proxy shall,
appoint an inspector or inspectors of election to act at the meeting. The number
of inspectors shall be either one (1) or three (3). If inspectors are appointed
at a meeting pursuant to the request of one (1) or more shareholders or proxies,
then the holders of a majority of shares or their proxies present at the meeting
shall determine whether one (1) or three (3) inspectors are to be appointed. If
any person appointed as inspector fails to appear or fails or refuses to act,
then the chairman of the meeting may, and upon the request of any shareholder or
a shareholder's proxy shall, appoint a person to fill that vacancy.

         Such inspectors shall:

                  (a)      determine the number of shares outstanding and the
voting power of each, the number of shares represented at the meeting, the
existence of a quorum and the authenticity, validity and effect of proxies;

                  (b)      receive votes, ballots or consents;

                  (c)      hear and determine all challenges and questions in
any way arising in connection with the right to vote;

                  (d)      count and tabulate all votes or consents;

                  (e)      determine when the polls shall close;

                  (f)      determine the result; and

                  (g)      do any other acts that may be proper to conduct the
election or vote with fairness to all shareholders.

         2.13     ADVANCE NOTICE OF SHAREHOLDER NOMINEES


         Nominations of persons for election to the Board of Directors of the
corporation may be made at a meeting of shareholders by or at the direction of
the Board of Directors or by any shareholder of the corporation entitled to vote
in the election of the directors at the meeting who complies with the notice
procedures set forth in this Section. Such nominations, other than those made by
or at the direction of the Board of Directors, shall be made pursuant to timely
notice in writing to the Secretary of the corporation. To be timely, a
shareholder's notice shall be delivered to or mailed not less than twenty (20)
days nor more than sixty (60) days prior to the meeting; provided, however, that
in the event that less than thirty (30) days notice or prior public disclosure
of the date of the meeting is given or made to shareholders, notice by the
shareholder, to be timely, must be so received not later than the close of
business on the tenth day following the day on which such notice of the date of
the meeting was mailed or such public disclosure was made. Such shareholder's
notice shall set forth (a) as to each person, if any, whom the 

                                      -6-
<PAGE>   10
shareholder proposes to nominate for election or re-election as director: (i)
the name, age, business address and residence address of such person, (ii) the
principal occupation or employment of such person, (iii) the class and number of
shares of the corporation which are beneficially owned by such person, (iv) any
other information relating to such person that is required by law to be
disclosed in solicitations of proxies for election of directors, and (v) such
person's written consent to being named as a nominee and to serving as a
director if elected; and (b) as to the shareholder giving the notice : (i) the
name and address, as they appear on the corporation's books of such shareholder,
(ii) the class and number of shares of this corporation which are beneficially
owned by such shareholder, and (iii) a description of all arrangements or
understandings between such shareholder and each nominee and any other person or
persons (naming such person or persons) relating to the nomination. At the
request of the Board of Directors any person nominated by the Board for election
as a director shall furnish to the Secretary of the corporation that information
required to be set forth in the shareholder's notice of nomination which
pertains to the nominee. No person shall be eligible for election as a director
of the corporation unless nominated in accordance with the procedures set forth
in this Section. The chairman of the meeting shall, if the facts warrant,
determine and declare at the meeting that a nomination was not made in
accordance with the procedures prescribed by these bylaws, and if he should so
determine, he shall so declare at the meeting and the defective nomination shall
be disregarded.

         2.14     ADVANCE NOTICE OF SHAREHOLDER BUSINESS

         At an annual meeting of the shareholders, only such business shall be
conducted as shall have been properly brought before the meeting. To be properly
brought before an annual meeting, business must be: (a) specified in the notice
of meeting (or any supplement thereto) given by or at the direction of the Board
of Directors, (b) otherwise properly brought before the meeting by or at the
direction of the Board of Directors, or (c) otherwise properly brought before
the meeting by a shareholder. Business to be brought before an annual meeting by
a shareholder shall not be considered properly brought if the shareholder has
not given timely notice thereof in writing to the Secretary of the corporation.
To be timely, a shareholder's notice shall be delivered to or mailed not less
than twenty (20) days nor more than sixty (60) days prior to the meeting;
provided, however, that in the event less than thirty (30) days notice or prior
public disclosure of the date of the meeting is given or made to shareholders,
notice by the shareholder, to be timely, must be so received not later than the
close of business on the tenth day following the day on which such notice of the
date of the meeting was mailed or such public disclosure was made. Such
shareholder's notice shall set forth as to each matter the shareholder proposes
to bring before the annual meeting: (i) a brief description of the business
desired to be brought before the annual meeting and the reasons for conduction
of such business at the annual meeting, (ii) the name and address of the
shareholder proposing such business, (iii) the class and number of shares of the
corporation which are beneficially owned by the shareholder, (iv) any material
interest of the shareholder in such business, and (v) any other information that
is required by law to be provided by the shareholder in his capacity as a
proponent of a shareholder proposal. Notwithstanding anything in these bylaws to
the contrary, no business shall be conducted an any annual meeting except in
accordance with the procedures set forth in this Section. The chairman of the
annual meeting shall, if the facts warrant, determine and declare at the meeting
that business 

                                      -7-
<PAGE>   11
was not properly brought before the meeting and in accordance with the
provisions of this Section, and, if he should so determine, he shall so declare
at the meeting that any such business not properly brought before the meeting
shall not be transacted.

                                   ARTICLE III

                                    DIRECTORS

         3.1      POWERS 

         Subject to the provisions of the Code and any limitations in the
articles of incorporation and these bylaws relating to action required to be
approved by the shareholders or by the outstanding shares, the business and
affairs of the corporation shall be managed and all corporate powers shall be
exercised by or under the direction of the board of directors.

         3.2      NUMBER OF DIRECTORS

         The number of directors of the corporation shall be not less than five
(5) nor more than eight (8). The exact number of directors shall be eight (8)
until changed, within the limits specified above, by a bylaw amending this
Section 3.2, duly adopted by the board of directors or by the shareholders. The
indefinite number of directors may be changed, or a definite number may be fixed
without provision for an indefinite number, by a duly adopted amendment to the
articles of incorporation or by an amendment to this bylaw duly adopted by the
vote or written consent of holders of a majority of the outstanding shares
entitled to vote; provided, however, that an amendment reducing the fixed number
or the minimum number of directors to a number less than five (5) cannot be
adopted if the votes cast against its adoption at a meeting, or the shares not
consenting in the case of an action by written consent, are equal to more than
sixteen and two-thirds percent (16-2/3%) of the outstanding shares entitled to
vote thereon. No amendment may change the stated maximum number of authorized
directors to a number greater than two (2) times the stated minimum number of
directors minus one (1).

         No reduction of the authorized number of directors shall have the
effect of removing any director before that director's term of office expires.

         3.3      ELECTION AND TERM OF OFFICE OF DIRECTORS

         Directors shall be elected at each annual meeting of shareholders to
hold office until the next annual meeting. Each director, including a director
elected to fill a vacancy, shall hold office until the expiration of the term
for which elected and until a successor has been elected and qualified.

         3.4      RESIGNATION AND VACANCIES

         Any director may resign effective on giving written notice to the
chairman of the board, the president, the secretary or the board of directors,
unless the notice specifies a later time for that resignation to become
effective. If the resignation of a director is effective at a future time, the
board of directors may elect a successor to take office when the resignation
becomes effective.

                                      -8-
<PAGE>   12
         Vacancies in the board of directors may be filled by a majority of the
remaining directors, even if less than a quorum, or by a sole remaining
director; however, a vacancy created by the removal of a director by the vote of
the shareholders or by court order may be filled only by the affirmative vote of
a majority of the shares represented and voting at a duly held meeting at which
a quorum is present (which shares voting affirmatively also constitute a
majority of the required quorum). Each director so elected shall hold office
until the next annual meeting of the shareholders and until a successor has been
elected and qualified.

         A vacancy or vacancies in the board of directors shall be deemed to
exist (i) in the event of the death, resignation or removal of any director,
(ii) if the board of directors by resolution declares vacant the office of a
director who has been declared of unsound mind by an order of court or convicted
of a felony, (iii) if the authorized number of directors is increased, or (iv)
if the shareholders fail, at any meeting of shareholders at which any director
or directors are elected, to elect the number of directors to be elected at that
meeting.

         The shareholders may elect a director or directors at any time to fill
any vacancy or vacancies not filled by the directors.

         3.5      PLACE OF MEETINGS; MEETINGS BY TELEPHONE

         Regular meetings of the board of directors may be held at any place
within or outside the State of California that has been designated from time to
time by resolution of the board. In the absence of such a designation, regular
meetings shall be held at the principal executive office of the corporation.
Special meetings of the board may be held at any place within or outside the
State of California that has been designated in the notice of the meeting or, if
not stated in the notice or if there is no notice, at the principal executive
office of the corporation.

         Any meeting, regular or special, may be held by conference telephone or
similar communication equipment, so long as all directors participating in the
meeting can hear one another; and all such directors shall be deemed to be
present in person at the meeting.

         3.6      REGULAR MEETINGS

         Regular meetings of the board of directors may be held without notice
if the times of such meetings are fixed by the board of directors.

         3.7      SPECIAL MEETINGS; NOTICE

         Special meetings of the board of directors for any purpose or purposes
may be called at any time by the chairman of the board, the president, any vice
president, the secretary or any two directors.

         Notice of the time and place of special meetings shall be delivered
personally or by telephone to each director or sent by first-class mail or
telegram, charges prepaid, addressed to each director at that director's address
as it is shown on the records of the corporation. If the notice is mailed, it
shall be deposited in the United States mail at least four (4) days before the
time of the holding of the meeting. If the notice is delivered personally or by
telephone or 

                                      -9-
<PAGE>   13
telegram, it shall be delivered personally or by telephone or to the telegraph
company at least forty-eight (48) hours before the time of the holding of the
meeting. Any oral notice given personally or by telephone may be communicated
either to the director or to a person at the office of the director who the
person giving the notice has reason to believe will promptly communicate it to
the director. The notice need not specify the purpose or the place of the
meeting, if the meeting is to be held at the principal executive office of the
corporation.

         3.8      QUORUM 

         A majority of the authorized number of directors shall constitute a
quorum for the transaction of business, except to adjourn as provided in Section
3.10 of these bylaws. Every act or decision done or made by a majority of the
directors present at a duly held meeting at which a quorum is present shall be
regarded as the act of the board of directors, subject to the provisions of
Section 310 of the Code (as to approval of contracts or transactions in which a
director has a direct or indirect material financial interest), Section 311 of
the Code (as to appointment of committees), Section 317(e) of the Code (as to
indemnification of directors), the articles of incorporation and other
applicable law.

         A meeting at which a quorum is initially present may continue to
transact business notwithstanding the withdrawal of directors, if any action
taken is approved by at least a majority of the required quorum for that
meeting.

         3.9      WAIVER OF NOTICE

         Notice of a meeting need not be given to any director (i) who signs a
waiver of notice or a consent to holding the meeting or an approval of the
minutes thereof, whether before or after the meeting, or (ii) who attends the
meeting without protesting, prior thereto or at its commencement, the lack of
notice to such directors. All such waivers, consents and approvals shall be
filed with the corporate records or made part of the minutes of the meeting. A
waiver of notice need not specify the purpose of any regular or special meeting
of the board of directors.

         3.10     ADJOURNMENT

         A majority of the directors present, whether or not constituting a
quorum, may adjourn any meeting to another time and place.

         3.11     NOTICE OF ADJOURNMENT

         Notice of the time and place of holding an adjourned meeting need not
be given unless the meeting is adjourned for more than twenty-four (24) hours.
If the meeting is adjourned for more than twenty-four (24) hours, then notice of
the time and place of the adjourned meeting shall be given before the adjourned
meeting takes place, in the manner specified in Section 3.7 of these bylaws, to
the directors who were not present at the time of the adjournment.

                                      -10-
<PAGE>   14
         3.12     BOARD ACTION BY WRITTEN CONSENT WITHOUT A MEETING

         Any action required or permitted to be taken by the board of directors
may be taken without a meeting, provided that all members of the board
individually or collectively consent in writing to that action. Such action by
written consent shall have the same force and effect as a unanimous vote of the
board of directors. Such written consent and any counterparts thereof shall be
filed with the minutes of the proceedings of the board.

         3.13     FEES AND COMPENSATION OF DIRECTORS

         Directors and members of committees may receive such compensation, if
any, for their services and such reimbursement of expenses as may be fixed or
determined by resolution of the board of directors. This Section 3.13 shall not
be construed to preclude any director from serving the corporation in any other
capacity as an officer, agent, employee or otherwise and receiving compensation
for those services.

         3.14     APPROVAL OF LOANS TO OFFICERS*

         The corporation may, upon the approval of the board of directors alone,
make loans of money or property to, or guarantee the obligations of, any officer
of the corporation or its parent or subsidiary, whether or not a director, or
adopt an employee benefit plan or plans authorizing such loans or guaranties
provided that (i) the board of directors determines that such a loan or guaranty
or plan may reasonably be expected to benefit the corporation, (ii) the
corporation has outstanding shares held of record by 100 or more persons
(determined as provided in Section 605 of the Code) on the date of approval by
the board of directors, and (iii) the approval of the board of directors is by a
vote sufficient without counting the vote of any interested director or
directors.

                                   ARTICLE IV

                                   COMMITTEES

         4.1      COMMITTEES OF DIRECTORS

         The board of directors may, by resolution adopted by a majority of the
authorized number of directors, designate one (1) or more committees, each
consisting of two or more directors, to serve at the pleasure of the board. The
board may designate one (1) or more directors as alternate members of any
committee, who may replace any absent member at any meeting of the committee.
The appointment of members or alternate members of a committee requires the vote
of a majority of the authorized number of directors. Any committee, to the
extent provided in the resolution of the board, shall have all the authority of
the board, except with respect to:

                  (a)      the approval of any action which, under the Code,
also requires shareholders' approval or approval of the outstanding shares;

- --------
* This section is effective only if it has been approved by the shareholders in
accordance with Sections 315(b) and 152 of the Code.

                                      -11-
<PAGE>   15
                  (b)      the filling of vacancies on the board of directors or
in any committee;

                  (c)      the fixing of compensation of the directors for
serving on the board or any committee;

                  (d)      the amendment or repeal of these bylaws or the
adoption of new bylaws;

                  (e)      the amendment or repeal of any resolution of the
board of directors which by its express terms is not so amendable or repealable;

                  (f)      a distribution to the shareholders of the
corporation, except at a rate or in a periodic amount or within a price range
determined by the board of directors; or

                  (g)      the appointment of any other committees of the board
of directors or the members of such committees.

         4.2      MEETINGS AND ACTION OF COMMITTEES

         Meetings and actions of committees shall be governed by, and held and
taken in accordance with, the provisions of Article III of these bylaws, Section
3.5 (place of meetings), Section 3.6 (regular meetings), Section 3.7 (special
meetings and notice), Section 3.8 (quorum), Section 3.9 (waiver of notice),
Section 3.10 (adjournment), Section 3.11 (notice of adjournment), and Section
3.12 (action without meeting), with such changes in the context of those bylaws
as are necessary to substitute the committee and its members for the board of
directors and its members; provided, however, that the time of regular meetings
of committees may be determined either by resolution of the board of directors
or by resolution of the committee, that special meetings of committees may also
be called by resolution of the board of directors, and that notice of special
meetings of committees shall also be given to all alternate members, who shall
have the right to attend all meetings of the committee. The board of directors
may adopt rules for the government of any committee not inconsistent with the
provisions of these bylaws.

                                    ARTICLE V

                                    OFFICERS

         5.1      OFFICERS

         The officers of the corporation shall be a president, a secretary and a
chief financial officer. The corporation may also have, at the discretion of the
board of directors, a chairman of the board, one or more vice presidents, one or
more assistant secretaries, one or more assistant treasurers and such other
officers as may be appointed in accordance with the provisions of Section 5.3 of
these bylaws. Any number of offices may be held by the same person.

                                      -12-
<PAGE>   16
         5.2      ELECTION OF OFFICERS

         The officers of the corporation, except such officers as may be
appointed in accordance with the provisions of Section 5.3 or Section 5.5 of
these bylaws, shall be chosen by the board, subject to the rights, if any, of an
officer under any contract of employment.

         5.3      SUBORDINATE OFFICERS

         The board of directors may appoint, or may empower the president to
appoint, such other officers as the business of the corporation may require,
each of whom shall hold office for such period, have such authority and perform
such duties as are provided in these bylaws or as the board of directors may
from time to time determine.

         5.4      REMOVAL AND RESIGNATION OF OFFICERS

         Subject to the rights, if any, of an officer under any contract of
employment, any officer may be removed, either with or without cause, by the
board of directors at any regular or special meeting of the board or, except in
case of an officer chosen by the board of directors, by any officer upon whom
such power of removal may be conferred by the board of directors.

         Any officer may resign at any time by giving written notice to the
corporation. Any resignation shall take effect at the date of the receipt of
that notice or at any later time specified in that notice; and, unless otherwise
specified in that notice, the acceptance of the resignation shall not be
necessary to make it effective. Any resignation is without prejudice to the
rights, if any, of the corporation under any contract to which the officer is a
party.

         5.5      VACANCIES IN OFFICES

         A vacancy in any office because of death, resignation, removal,
disqualification or any other cause shall be filled in the manner prescribed in
these bylaws for regular appointments to that office.

         5.6      CHAIRMAN OF THE BOARD

         The chairman of the board, if such an officer be elected, shall, if
present, preside at meetings of the board of directors and exercise and perform
such other powers and duties as may from time to time be assigned to him by the
board of directors or as may be prescribed by these bylaws. If there is no
president, then the chairman of the board shall also be the chief executive
officer of the corporation and shall have the powers and duties prescribed in
Section 5.7 of these bylaws.

         5.7      PRESIDENT

         Subject to such supervisory powers, if any, as may be given by the
board of directors to the chairman of the board, if there be such an officer,
the president shall be the chief executive officer of the corporation and shall,
subject to the control of the board of directors, have general supervision,
direction and control of the business and the officers of the corporation. He
shall 

                                      -13-
<PAGE>   17
preside at all meetings of the shareholders and, in the absence or nonexistence
of a chairman of the board, at all meetings of the board of directors. He shall
have the general powers and duties of management usually vested in the office of
president of a corporation, and shall have such other powers and duties as may
be prescribed by the board of directors or these bylaws.

         5.8      VICE PRESIDENTS

         In the absence or disability of the president, the vice presidents, if
any, in order of their rank as fixed by the board of directors or, if not
ranked, a vice president designated by the board of directors, shall perform all
the duties of the president and when so acting shall have all the powers of, and
be subject to all the restrictions upon, the president. The vice presidents
shall have such other powers and perform such other duties as from time to time
may be prescribed for them respectively by the board of directors, these bylaws,
the president or the chairman of the board.

         5.9      SECRETARY

         The secretary shall keep or cause to be kept, at the principal
executive office of the corporation or such other place as the board of
directors may direct, a book of minutes of all meetings and actions of
directors, committees of directors and shareholders. The minutes shall show the
time and place of each meeting, whether regular or special (and, if special, how
authorized and the notice given), the names of those present at directors'
meetings or committee meetings, the number of shares present or represented at
shareholders' meetings and the proceedings thereof.

         The secretary shall keep, or cause to be kept, at the principal
executive office of the corporation or at the office of the corporation's
transfer agent or registrar, as determined by resolution of the board of
directors, a share register, or a duplicate share register, showing the names of
all shareholders and their addresses, the number and classes of shares held by
each, the number and date of certificates evidencing such shares and the number
and date of cancellation of every certificate surrendered for cancellation.

         The secretary shall give, or cause to be given, notice of all meetings
of the shareholders and of the board of directors required to be given by law or
by these bylaws. He shall keep the seal of the corporation, if one be adopted,
in safe custody and shall have such other powers and perform such other duties
as may be prescribed by the board of directors or by these bylaws.

         5.10     CHIEF FINANCIAL OFFICER

         The chief financial officer shall keep and maintain, or cause to be
kept and maintained, adequate and correct books and records of accounts of the
properties and business transactions of the corporation, including accounts of
its assets, liabilities, receipts, disbursements, gains, losses, capital,
retained earnings and shares. The books of account shall at all reasonable times
be open to inspection by any director.

         The chief financial officer shall deposit all money and other valuables
in the name and to the credit of the corporation with such depositories as may
be designated by the board of directors. He shall disburse the funds of the
corporation as may be ordered by the board of 

                                      -14-
<PAGE>   18
directors, shall render to the president and directors, whenever they request
it, an account of all of his transactions as chief financial officer and of the
financial condition of the corporation and shall have such other powers and
perform such other duties as may be prescribed by the board of directors or
these bylaws.

                                   ARTICLE VI

                INDEMNIFICATION OF DIRECTORS, OFFICERS, EMPLOYEES

                                AND OTHER AGENTS

         6.1      INDEMNIFICATION OF DIRECTORS AND OFFICERS

         The corporation shall, to the maximum extent and in the manner
permitted by the Code, indemnify each of its directors and officers against
expenses (as defined in Section 317(a) of the Code), judgments, fines,
settlements and other amounts actually and reasonably incurred in connection
with any proceeding (as defined in Section 317(a) of the Code), arising by
reason of the fact that such person is or was an agent of the corporation. For
purposes of this Article VI, a "director" or "officer" of the corporation
includes any person (i) who is or was a director or officer of the corporation,
(ii) who is or was serving at the request of the corporation as a director or
officer of another corporation, partnership, joint venture, trust or other
enterprise, or (iii) who was a director or officer of a corporation which was a
predecessor corporation of the corporation or of another enterprise at the
request of such predecessor corporation.

         6.2      INDEMNIFICATION OF OTHERS

         The corporation shall have the power, to the extent and in the manner
permitted by the Code, to indemnify each of its employees and agents (other than
directors and officers) against expenses (as defined in Section 317(a) of the
Code), judgments, fines, settlements and other amounts actually and reasonably
incurred in connection with any proceeding (as defined in Section 317(a) of the
Code), arising by reason of the fact that such person is or was an agent of the
corporation. For purposes of this Article VI, an "employee" or "agent" of the
corporation (other than a director or officer) includes any person (i) who is or
was an employee or agent of the corporation, (ii) who is or was serving at the
request of the corporation as an employee or agent of another corporation,
partnership, joint venture, trust or other enterprise, or (iii) who was an
employee or agent of a corporation which was a predecessor corporation of the
corporation or of another enterprise at the request of such predecessor
corporation.

         6.3      PAYMENT OF EXPENSES IN ADVANCE

         Expenses incurred in defending any civil or criminal action or
proceeding for which indemnification is required pursuant to Section 6.1 or for
which indemnification is permitted pursuant to Section 6.2 following
authorization thereof by the Board of Directors shall be paid by the corporation
in advance of the final disposition of such action or proceeding upon receipt of
an undertaking by or on behalf of the indemnified party to repay such amount if
it shall ultimately be determined that the indemnified party is not entitled to
be indemnified as authorized in this Article VI.

                                      -15-
<PAGE>   19
         6.4      INDEMNITY NOT EXCLUSIVE

         The indemnification provided by this Article VI shall not be deemed
exclusive of any other rights to which those seeking indemnification may be
entitled under any bylaw, agreement, vote of shareholders or disinterested
directors or otherwise, both as to action in an official capacity and as to
action in another capacity while holding such office, to the extent that such
additional rights to indemnification are authorized in the articles of
incorporation.

         6.5      INSURANCE INDEMNIFICATION

         The corporation shall have the power to purchase and maintain insurance
on behalf of any person who is or was a director, officer, employee or agent of
the corporation against any liability asserted against or incurred by such
person in such capacity or arising out of such person's status as such, whether
or not the corporation would have the power to indemnify him against such
liability under the provisions of this Article VI.

         6.6      CONFLICTS

         No indemnification or advance shall be made under this Article VI,
except where such indemnification or advance is mandated by law or the order,
judgment or decree of any court of competent jurisdiction, in any circumstance
where it appears:

         (1)      That it would be inconsistent with a provision of the articles
of incorporation, these bylaws, a resolution of the shareholders or an agreement
in effect at the time of the accrual of the alleged cause of the action asserted
in the proceeding in which the expenses were incurred or other amounts were
paid, which prohibits or otherwise limits indemnification; or

         (2)      That it would be inconsistent with any condition expressly
imposed by a court in approving a settlement.

                                   ARTICLE VII

                               RECORDS AND REPORTS

         7.1      MAINTENANCE AND INSPECTION OF SHARE REGISTER

         The corporation shall keep either at its principal executive office or
at the office of its transfer agent or registrar (if either be appointed), as
determined by resolution of the board of directors, a record of its shareholders
listing the names and addresses of all shareholders and the number and class of
shares held by each shareholder.

         A shareholder or shareholders of the corporation who holds at least
five percent (5%) in the aggregate of the outstanding voting shares of the
corporation or who holds at least one percent (1%) of such voting shares and has
filed a Schedule 14B with the Securities and Exchange Commission relating to the
election of directors, may (i) inspect and copy the records of shareholders'
names, addresses and shareholdings during usual business hours on five (5) days'
prior written demand on the corporation, (ii) obtain from the transfer agent of
the corporation, on 

                                      -16-
<PAGE>   20
written demand and on the tender of such transfer agent's usual charges for such
list, a list of the names and addresses of the shareholders who are entitled to
vote for the election of directors, and their shareholdings, as of the most
recent record date for which that list has been compiled or as of a date
specified by the shareholder after the date of demand. Such list shall be made
available to any such shareholder by the transfer agent on or before the later
of five (5) days after the demand is received or five (5) days after the date
specified in the demand as the date as of which the list is to be compiled.

         The record of shareholders shall also be open to inspection on the
written demand of any shareholder or holder of a voting trust certificate, at
any time during usual business hours, for a purpose reasonably related to the
holder's interests as a shareholder or as the holder of a voting trust
certificate.

         Any inspection and copying under this Section 7.1 may be made in person
or by an agent or attorney of the shareholder or holder of a voting trust
certificate making the demand.

         7.2      MAINTENANCE AND INSPECTION OF BYLAWS

         The corporation shall keep at its principal executive office or, if its
principal executive office is not in the State of California, at its principal
business office in California the original or a copy of these bylaws as amended
to date, which bylaws shall be open to inspection by the shareholders at all
reasonable times during office hours. If the principal executive office of the
corporation is outside the State of California and the corporation has no
principal business office in such state, then the secretary shall, upon the
written request of any shareholder, furnish to that shareholder a copy of these
bylaws as amended to date.

         7.3      MAINTENANCE AND INSPECTION OF OTHER CORPORATE RECORDS

         The accounting books and records and the minutes of proceedings of the
shareholders, of the board of directors and of any committee or committees of
the board of directors shall be kept at such place or places as are designated
by the board of directors or, in absence of such designation, at the principal
executive office of the corporation. The minutes shall be kept in written form,
and the accounting books and records shall be kept either in written form or in
any other form capable of being converted into written form.

         The minutes and accounting books and records shall be open to
inspection upon the written demand of any shareholder or holder of a voting
trust certificate, at any reasonable time during usual business hours, for a
purpose reasonably related to the holder's interests as a shareholder or as the
holder of a voting trust certificate. The inspection may be made in person or by
an agent or attorney and shall include the right to copy and make extracts. Such
rights of inspection shall extend to the records of each subsidiary corporation
of the corporation.

         7.4      INSPECTION BY DIRECTORS

         Every director shall have the absolute right at any reasonable time to
inspect all books, records and documents of every kind as well as the physical
properties of the corporation and 

                                      -17-
<PAGE>   21
each of its subsidiary corporations. Such inspection by a director may be made
in person or by an agent or attorney. The right of inspection includes the right
to copy and make extracts of documents.

         7.5      ANNUAL REPORT TO SHAREHOLDERS; WAIVER

         The board of directors shall cause an annual report to be sent to the
shareholders not later than one hundred twenty (120) days after the close of the
fiscal year adopted by the corporation. Such report shall be sent at least
fifteen (15) days (or, if sent by third-class mail, thirty-five (35) days)
before the annual meeting of shareholders to be held during the next fiscal year
and in the manner specified in Section 2.5 of these bylaws for giving notice to
shareholders of the corporation.

         The annual report shall contain (i) a balance sheet as of the end of
the fiscal year, (ii) an income statement, (iii) a statement of changes in
financial position for the fiscal year, and (iv) any report of independent
accountants or, if there is no such report, the certificate of an authorized
officer of the corporation that the statements were prepared without audit from
the books and records of the corporation.

         The foregoing requirement of an annual report shall be waived so long
as the shares of the corporation are held by fewer than one hundred (100)
holders of record.

         7.6      FINANCIAL STATEMENTS

         If no annual report for the fiscal year has been sent to shareholders,
then the corporation shall, upon the written request of any shareholder made
more than one hundred twenty (120) days after the close of such fiscal year,
deliver or mail to the person making the request, within thirty (30) days
thereafter, a copy of a balance sheet as of the end of such fiscal year and an
income statement and statement of changes in financial position for such fiscal
year.

         If a shareholder or shareholders holding at least five percent (5%) of
the outstanding shares of any class of stock of the corporation makes a written
request to the corporation for an income statement of the corporation for the
three-month, six-month or nine-month period of the then current fiscal year
ended more than thirty (30) days before the date of the request, and for a
balance sheet of the corporation as of the end of that period, then the chief
financial officer shall cause that statement to be prepared, if not already
prepared, and shall deliver personally or mail that statement or statements to
the person making the request within thirty (30) days after the receipt of the
request. If the corporation has not sent to the shareholders its annual report
for the last fiscal year, the statements referred to in the first paragraph of
this Section 7.6 shall likewise be delivered or mailed to the shareholder or
shareholders within thirty (30) days after the request.

         The quarterly income statements and balance sheets referred to in this
section shall be accompanied by the report, if any, of any independent
accountants engaged by the corporation or by the certificate of an authorized
officer of the corporation that the financial statements were prepared without
audit from the books and records of the corporation.

                                      -18-
<PAGE>   22
         7.7      REPRESENTATION OF SHARES OF OTHER CORPORATIONS

         The chairman of the board, the president, any vice president, the chief
financial officer, the secretary or assistant secretary of this corporation, or
any other person authorized by the board of directors or the president or a vice
president, is authorized to vote, represent and exercise on behalf of this
corporation all rights incident to any and all shares of any other corporation
or corporations standing in the name of this corporation. The authority herein
granted may be exercised either by such person directly or by any other person
authorized to do so by proxy or power of attorney duly executed by such person
having the authority.

                                  ARTICLE VIII

                                 GENERAL MATTERS

         8.1      RECORD DATE FOR PURPOSES OTHER THAN NOTICE AND VOTING

         For purposes of determining the shareholders entitled to receive
payment of any dividend or other distribution or allotment of any rights or the
shareholders entitled to exercise any rights in respect of any other lawful
action, the board of directors may fix, in advance, a record date, which shall
not be more than sixty (60) days before any such action. In that case, only
shareholders of record at the close of business on the date so fixed are
entitled to receive the dividend, distribution or allotment of rights, or to
exercise such rights, as the case may be, notwithstanding any transfer of any
shares on the books of the corporation after the record date so fixed, except as
otherwise provided in the Code.

         If the board of directors does not so fix a record date, then the
record date for determining shareholders for any such purpose shall be at the
close of business on the day on which the board adopts the applicable resolution
or the sixtieth (60th) day before the date of that action, whichever is later.

         8.2      CHECKS; DRAFTS; EVIDENCES OF INDEBTEDNESS

         From time to time, the board of directors shall determine by resolution
which person or persons may sign or endorse all checks, drafts, other orders for
payment of money, notes or other evidences of indebtedness that are issued in
the name of or payable to the corporation, and only the persons so authorized
shall sign or endorse those instruments.

         8.3      CORPORATE CONTRACTS AND INSTRUMENTS: HOW EXECUTED

         The board of directors, except as otherwise provided in these bylaws,
may authorize any officer or officers, or agent or agents, to enter into any
contract or execute any instrument in the name of and on behalf of the
corporation; such authority may be general or confined to specific instances.
Unless so authorized or ratified by the board of directors or within the agency
power of an officer, no officer, agent or employee shall have any power or
authority to bind the corporation by any contract or engagement or to pledge its
credit or to render it liable for any purpose or for any amount.

                                      -19-
<PAGE>   23
         8.4      CERTIFICATES FOR SHARES

         A certificate or certificates for shares of the corporation shall be
issued to each shareholder when any of such shares are fully paid. The board of
directors may authorize the issuance of certificates for shares partly paid
provided that these certificates shall state the total amount of the
consideration to be paid for them and the amount actually paid. All certificates
shall be signed in the name of the corporation by the chairman of the board or
the vice chairman of the board or the president or a vice president and by the
chief financial officer or an assistant treasurer or the secretary or an
assistant secretary, certifying the number of shares and the class or series of
shares owned by the shareholder. Any or all of the signatures on the certificate
may be facsimile.

         In case any officer, transfer agent or registrar who has signed or
whose facsimile signature has been placed on a certificate ceases to be that
officer, transfer agent or registrar before that certificate is issued, it may
be issued by the corporation with the same effect as if that person were an
officer, transfer agent or registrar at the date of issue.

         8.5      LOST CERTIFICATES

         Except as provided in this Section 8.5, no new certificates for shares
shall be issued to replace a previously issued certificate unless the latter is
surrendered to the corporation and cancelled at the same time. The board of
directors may, in case any share certificate or certificate for any other
security is lost, stolen or destroyed, authorize the issuance of replacement
certificates on such terms and conditions as the board may require; the board
may require indemnification of the corporation secured by a bond or other
adequate security sufficient to protect the corporation against any claim that
may be made against it, including any expense or liability, on account of the
alleged loss, theft or destruction of the certificate or the issuance of the
replacement certificate.

         8.6      CONSTRUCTION; DEFINITIONS

         Unless the context requires otherwise, the general provisions, rules of
construction and definitions in the Code shall govern the construction of these
bylaws. Without limiting the generality of this provision, the singular number
includes the plural, the plural number includes the singular and the term
"person" includes both a corporation and a natural person.

                                   ARTICLE IX

                                   AMENDMENTS

         9.1      AMENDMENT BY SHAREHOLDERS

         New bylaws may be adopted or these bylaws may be amended or repealed by
the vote of holders of a majority of the outstanding shares entitled to vote;
provided, however, that if the articles of incorporation of the corporation set
forth the number of authorized directors of the corporation, then the authorized
number of directors may be changed only by an amendment of the articles of
incorporation.

                                      -20-
<PAGE>   24
         9.2      AMENDMENT BY DIRECTORS

         Subject to the rights of the shareholders as provided in Section 9.1 of
these bylaws, bylaws, other than a bylaw or an amendment of a bylaw changing the
authorized number of directors (except to fix the authorized number of directors
pursuant to a bylaw providing for a variable number of directors), may be
adopted, amended or repealed by the board of directors.

                                      -21-
<PAGE>   25
                         CERTIFICATE OF ADOPTION BY THE

                                  SECRETARY OF

                                     ISOCOR

         The undersigned, Elias J. Blawie, hereby certifies that he is the duly
elected and acting Secretary of ISOCOR, a California corporation (the
"Company"), and that the Bylaws attached hereto constitute the Bylaws of said
Company as duly adopted by the Corporation's Board of Directors on January 19,
1996 and by the Corporation's Shareholders on January 19, 1996.

         IN WITNESS WHEREOF, the undersigned has hereunto subscribed his name
this 25th day of January 1996.




                                                        /s/ Elias J. Blawie
                                                    ----------------------------
                                                    Elias J. Blawie,
                                                    Secretary

                                      -22-

<PAGE>   1

                                                                    EXHIBIT 5.1


                            [VENTURE LAW GROUP LOGO]



                                  June 4, 1996

ISOCOR
3420 Ocean Park Boulevard
Santa Monica, CA  90405

         REGISTRATION STATEMENT ON FORM S-8

Ladies and Gentlemen:

         We have examined the Registration Statement on Form S-8 to be filed by
you with the Securities and Exchange Commission on or about June 4, 1996 (the
"Registration Statement") in connection with the registration under the
Securities Act of 1933, as amended, of a total of 2,088,928 shares of your
Common Stock (the "Shares") reserved for issuance under the 1996 Employee Stock
Purchase Plan, the 1992 Stock Option Plan and the 1996 Directors' Stock Option
Plan (collectively, the "Plans"). As your legal counsel, we have examined the
proceedings taken and are familiar with the proceedings proposed to be taken by
you in connection with the sale and issuance of the Shares under the Plans.

         It is our opinion that, when issued and sold in the manner referred to
in the Plans and pursuant to the respective agreement which accompanies each
grant under the Plans, the Shares will be legally and validly issued, fully paid
and nonassessable.

         We consent to the use of this opinion as an exhibit to the Registration
Statement and further consent to the use of our name wherever it appears in the
Registration Statement and any amendments to it.

                                                     Sincerely,

                                                     VENTURE LAW GROUP


                                                     /s/ Venture Law Group
                                                     ---------------------


EJB

                            2800 Sand Hill Road
                            Menlo Park, CA 94025
                             Phone 415-854-4488
                              FAX 415-854-1121


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