ISOCOR
S-8, 1998-08-11
PREPACKAGED SOFTWARE
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<PAGE>   1
            As filed with the Securities and Exchange Commission on
                                                    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)

                                   California
         (State or Other Jurisdiction of Incorporation or Organization)

                                   95-4310259
                      (I.R.S. Employer Identification No.)

        3420 Ocean Park Boulevard
        Santa Monica, California                                        90405
(Address of Principal Executive Offices)                              (Zip Code)

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



                             1992 STOCK OPTION PLAN
                            (Full Title of the Plan)

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

                                    Paul Gigg
                      President and Chief Executive Officer
                                     ISOCOR
                            3420 Ocean Park Boulevard
                         Santa Monica, California 90405
                    (Name and Address for Agent For Service)

                                 (310) 581-8100
          (Telephone Number, Including Area Code, of Agent For Service)

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


<PAGE>   2


                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
                                                            Proposed Maximum         Proposed Maximum
Title of Securities to be                                  Offering Price Per      Aggregate Offering         Amount of
       Registered             Amount to be Registered            Share                   Price             Registration Fee
<S>                              <C>                          <C>                  <C>                     <C>
Common Stock,
  no par value..........         129,658 shares               $ 3.00 (2)             $   388,974.00            $ 114.75

Common Stock,
  no par value..........         220,342 shares               $ 3.00 (3)             $   661,026.00            $ 195.00

TOTAL                            350,000 shares (1)                                  $ 1,050,000.00            $ 309.75
</TABLE>

(1)    Represents an increase in the number of shares of Common Stock reserved
       for issuance upon the exercise of options issued under the Company's 1992
       Stock Option Plan (the "Plan") of 350,000 shares. The increase was
       approved by the Board of Directors of the Company on February 19, 1998
       and by the shareholders of the Company on May 13, 1998.

(2)    Computed in accordance with Rule 457(h) under the Securities Act of 1933,
       as amended (the "Act") solely for purposes of calculating the
       registration fee. The computation is based on the weighted average
       exercise price of options outstanding under the Plan for which the Common
       Stock issuable upon exercise thereof is being registered hereby.

(3)    Estimated in accordance with Rule 457(h) and 457(c) under the Act solely
       for purposes of calculating the registration fee. The computation is
       based on the closing price of the Company's Common Stock as reported on
       the Nasdaq National Market on August 4, 1998.



<PAGE>   3



PART II: INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

ITEM 3 INCORPORATION OF DOCUMENTS 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 Annual Report on Form 10-K filed on March 31, 1998
pursuant to Rule 15(d) of the Securities Exchange Act of 1934, as amended (the
"Exchange Act").

         ITEM 3 (b)

         The Registrant's Quarterly Report on Form 10-Q filed on May 15, 1998
pursuant to Rule 13(a) 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 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.


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 


<PAGE>   4

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. The
Company has obtained such directors' and officers' insurance.

         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>             <C>                                       
           4.1             1992 Stock Option Plan and forms of option agreement for 
                           use with plan.
           5.1             Opinion of Venture Law Group, A Professional Corporation,
                           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>


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 


<PAGE>   5

to the plan of distribution not previously disclosed in the Registration
Statement or any material change to such information in the Registration
Statement.

                  (2) That, for the purpose of determining any liability under
the Securities Act, 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 Securities Act of 1933, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 (and where applicable each filing of an employee
benefit plan's annual report pursuant to Section 15(d) of the Securities
Exchange Act of 1934) 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
Securities Act of 1933 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.



<PAGE>   6


                                   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 this 11th
day of August, 1998.

                                        ISOCOR


                                        By:  /s/ PAUL GIGG
                                             -----------------------------------
                                             Paul Gigg, President and
                                             Chief Executive Officer

                                POWER OF ATTORNEY

         KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Paul Gigg 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>
                                        
/s/       PAUL GIGG                     President, Chief Executive Officer and            August 11, 1998
- --------------------------------        Director (Principal Executive Officer)
         (Paul Gigg)

                                        
/s/   JANINE M. BUSHMAN                 Vice President, Finance and                       August 11, 1998
- --------------------------------        Administration, Chief Financial  Officer
     (Janine M. Bushman)                and Director (Principal Financial and
                                        Accounting Officer)

/s/      DENNIS CAGAN                   Director                                          August 11, 1998
- --------------------------------
        (Dennis Cagan)

                                        Chairman of the Board of Directors and            August 11, 1998
/s/      ANDREW DEMARI                  Director
- --------------------------------
       (Andrew De Mari)


/s/   ALEXANDRA GIURGIU                 Director                                          August 11, 1998
- --------------------------------
     (Alexandra Giurgiu)

/s/   G. BRADFORD JONES                 Director                                          August 11, 1998
- --------------------------------
     (G. Bradford Jones)

/s/     WILLIAM YUNDT                   Director                                          August 11, 1998
- --------------------------------
       (William Yundt)

</TABLE>

<PAGE>   7

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

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


                                    EXHIBITS

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

                       Registration Statement on Form S-8

                                     ISOCOR


                                August 11, 1998

<PAGE>   8


                                INDEX TO EXHIBITS

<TABLE>
<CAPTION>
Exhibit
Number

<S>           <C>                                                                     
  4.1         1992 Stock Option Plan and forms of option agreements for use with plan.

  5.1         Opinion of Venture Law Group, A Professional Corporation, as to legality
              of securities being registered

 23.1         Consent of Counsel (contained in Exhibit 5.1 hereto).

 23.2         Consent of Independent Auditors.

 24.1         Power of Attorney.

</TABLE>





<PAGE>   1

                                                                     EXHIBIT 4.1

                             1992 STOCK OPTION PLAN
                              AS AMENDED MAY, 1998

         1. Purposes of the Plan. The purposes of this Stock Option Plan are to
attract and retain the best available personnel for positions of substantial
responsibility, to provide additional incentive to Employees and Consultants of
the Company and its Subsidiaries and to promote the success of the Company's
business. Options granted under the Plan may be incentive stock options (as
defined under Section 422 of the Code) or non-statutory stock options, as
determined by the Administrator at the time of grant of an option and subject to
the applicable provisions of Section 422 of the Code, as amended, and the
regulations promulgated thereunder.

         2. Definitions. As used herein, the following definitions shall apply:

                  (a) "Administrator" means the Board or any of its Committees
appointed pursuant to paragraph (a) of Section 4 of the Plan.

                  (b) "Board" means the Board of Directors of the Company.

                  (c) "Code" means the Internal Revenue Code of 1986, as
amended.

                  (d) "Committee" means the Committee appointed by the Board of
Directors in accordance with paragraph (a) of Section 4 of the Plan.

                  (e) "Common Stock" means the Common Stock of the Company.

                  (f) "Company" means ISOCOR, a California corporation.

                  (g) "Consultant" means any person, including an advisor, who
is engaged by the Company or any Parent or Subsidiary to render consulting
services and is compensated for such services, and any director of the Company
whether compensated for such services or not, provided that if and in the event
the Company registers any class of any equity security pursuant to the Exchange
Act, the term Consultant shall thereafter not include directors who are not
compensated for their services or are paid only a director's fee by the Company.

                  (h) "Continuous Status as an Employee" means the absence of
any interruption or termination of the employment relationship by the Company or
any Subsidiary. Continuous Status as an Employee shall not be considered
interrupted in the case of: (i) sick leave; (ii) military leave; (iii) any other
leave of absence approved by the Board, provided that such leave is for a period
of not more than ninety (90) days, unless reemployment upon the expiration of
such leave is guaranteed by contract or statute, or unless provided otherwise
pursuant to Company policy adopted from time to time; or (iv) in the case of
transfers between locations of the Company or between the Company, its
Subsidiaries or its successor.


<PAGE>   2

                  (i) "Employee" means any person, including officers and
directors, employed by the Company or any Parent or Subsidiary of the Company.
The payment of a director's fee by the Company shall not be sufficient to
constitute "employment" by the Company.

                  (j) "Exchange Act" means the Securities Exchange Act of 1934,
as amended.

                  (k) "Fair Market Value" means, as of any date, the value of
Common Stock determined as follows:

                            (i) If the Common Stock is listed on any established
stock exchange or a national market system including without limitation the
National Market of the National Association of Securities Dealers, Inc.
Automated Quotation ("Nasdaq") System, its Fair Market Value shall be the
closing sales price for such stock (or the closing bid, if no sales were
reported, as quoted on such system or exchange, or the exchange with the
greatest volume of trading in Common Stock) for the last market trading day
prior to the time of determination, as reported in The Wall Street Journal or
such other source as the Administrator deems reliable;

                            (ii) If the Common Stock is quoted on the Nasdaq
System (but not on the National Market thereof) or regularly quoted by a
recognized securities dealer but selling prices are not reported, its Fair
Market Value shall be the mean between the high bid and low asked prices for the
Common Stock for the last market trading day prior to the time of determination,
as reported in The Wall Street Journal or such other source as the Administrator
deems reliable; or

                            (iii) In the absence of an established market for
the Common Stock, the Fair Market Value thereof shall be determined in good
faith by the Administrator.

                  (l) "Incentive Stock Option" means an Option intended to
qualify as an incentive stock option within the meaning of Section 422 of the
Code.

                  (m) "Named Executive" means (any individual who, on the last
day of the Company's fiscal year, is the chief executive officer of the Company
(or is acting in such capacity) or among the four highest compensated officers
of the Company (other than the chief executive officer). Such officer status
shall be determined pursuant to the executive compensation disclosure rules
under the Exchange Act.

                  (n) "Nonstatutory Stock Option" means an Option not intended
to qualify as an Incentive Stock Option.

                  (o) "Option" means a stock option granted pursuant to the
Plan.

                  (p) "Optioned Stock" means the Common Stock subject to an
Option.

                  (q) "Optionee" means an Employee or Consultant who receives an
Option.


                                      -2-
<PAGE>   3

                  (r) "Parent" means a "parent corporation", whether now or
hereafter existing, as defined in Section 424(e) of the Code.

                  (s) "Plan" means this 1992 Stock Option Plan.

                  (t) "Share" means a share of the Common Stock, as adjusted in
accordance with Section 13 of the Plan.

                  (u) "Subsidiary" means a "subsidiary corporation", whether now
or hereafter existing, as defined in Section 424(f) of the Code.

         3. Stock Subject to the Plan. Subject to the provisions of Section 13
of the Plan, the maximum aggregate number of shares that may be optioned and
sold under the Plan is 2,600,000 shares of Common Stock. The shares may be
authorized, but unissued, or reacquired Common Stock.

                  If an Option should expire or become unexercisable for any
reason without having been exercised in full, the unpurchased Shares that were
subject thereto shall, unless the Plan shall have been terminated, become
available for future grant under the Plan.

         4. Administration of the Plan.

                  (a)      Composition of Administrator.

                            (i) Multiple Administrative Bodies. If permitted by
Rule 16b-3, and by the legal requirements relating to the administration of
incentive stock option plans, if any, of applicable securities laws and the Code
(collectively, the "Applicable Laws"), the Plan may (but need not) be
administered by different administrative bodies with respect to directors,
officers who are not directors and Employees who are neither directors nor
officers.

                            (ii) Administration with respect to Directors and
Officers. With respect to grants of Options to Employees or Consultants who are
also officers or directors of the Company, the Plan shall be administered by (A)
the Board, if the Board may administer the Plan in compliance with Rule 16b-3 as
it applies to a plan intended to qualify thereunder as a discretionary plan and
Section 162(m) of the Code as it applies so as to qualify grants of Options to
Named Executives as performance-based compensation, or (B) a Committee
designated by the Board to administer the Plan, which Committee shall be
constituted in such a manner as to permit the Plan to comply with Rule 16b-3 as
it applies to a plan intended to qualify thereunder as a discretionary plan, to
qualify grants of Options to Named Executives as performance-based compensation
under Section 162(m) of the Code and otherwise so as to satisfy the Applicable
Laws.



                                      -3-
<PAGE>   4

                            (iii) Administration with respect to Other Persons.
With respect to grants of Options to Employees or Consultants who are neither
directors nor officers of the Company, the Plan shall be administered by (A) the
Board or (B) a Committee designated by the Board, which Committee shall be
constituted in such a manner as to satisfy the Applicable Laws.

                            (iv) General. If a Committee has been appointed
pursuant to subsection (ii) or (iii) of this Section 4(a), such Committee shall
continue to serve in its designated capacity until otherwise directed by the
Board. From time to time the Board may increase the size of any Committee and
appoint additional members thereof, remove members (with or without cause) and
appoint new members in substitution therefor, fill vacancies (however caused)
and remove all members of a Committee and thereafter directly administer the
Plan, all to the extent permitted by the Applicable Laws and, in the case of a
Committee appointed under subsection (ii), to the extent permitted by Rule 16b-3
as it applies to a plan intended to qualify thereunder as a discretionary plan,
and to the extent required under Section 162(m) of the Code to qualify grants of
Options to Named Executives as performance-based compensation.

                  (b) Powers of the Administrator. Subject to the provisions of
the Plan and in the case of a Committee, the specific duties delegated by the
Board to such Committee, the Administrator shall have the authority, in its
discretion:

                           (i) to determine the Fair Market Value of the Common
                  Stock, in accordance with Section 2(k) of the Plan;

                           (ii) to select the Consultants and Employees to whom
                  Options may from time to time be granted hereunder;

                           (iii) to determine whether and to what extent Options
                  are granted hereunder;

                           (iv) to determine the number of shares of Common
                  Stock to be covered by each such award granted hereunder;

                           (v) to approve forms of agreement for use under the
                  Plan;

                           (vi) to determine the terms and conditions, not
                  inconsistent with the terms of the Plan, of any award granted
                  hereunder (including, but not limited to, the share price and
                  any restriction or limitation);

                           (vii) to determine whether and under what
                  circumstances an Option may be settled in cash under Section
                  10(f) instead of Common Stock;

                           (viii) to reduce the exercise price of any Option to
                  the then current Fair Market Value if the Fair Market Value of
                  the Common Stock covered by such Option shall have declined
                  since the date the Option was granted.



                                      -4-
<PAGE>   5

                 (c) Effect of Administrator's Decision. All decisions,
         determinations and interpretations of the Administrator shall be final
         and binding on all Optionees and any other holders of any Options.

         5.       Eligibility.

                  (a) Nonstatutory Stock Options may be granted to Employees and
Consultants. Incentive Stock Options may be granted only to Employees. An
Employee or Consultant who has been granted an Option may, if he or she is
otherwise eligible, be granted an additional Option or Options.

                  (b) Each Option shall be designated in the written option
agreement as either an Incentive Stock Option or a Nonstatutory Stock Option.
However, notwithstanding such designations, to the extent that the aggregate
Fair Market Value of the Shares with respect to which Options designated as
Incentive Stock Options are exercisable for the first time by any Optionee
during any calendar year (under all plans of the Company or any Parent or
Subsidiary) exceeds $100,000, such excess Options shall be treated as
Nonstatutory Stock Options.

                  (c) For purposes of Section 5(b), Incentive Stock Options
shall be taken into account in the order in which they were granted, and the
Fair Market Value of the Shares shall be determined as of the time the Option
with respect to such Shares is granted.

                  (d) The Plan shall not confer upon any Optionee any right with
respect to continuation of employment or consulting relationship with the
Company, nor shall it interfere in any way with an Optionee's right or the
Company's right to terminate his or her employment or consulting relationship at
any time, with or without cause.

         6. Term of Plan. The Plan shall become effective upon the earlier to
occur of its adoption by the Board of Directors or its approval by the
shareholders of the Company as described in Section 19 of the Plan. It shall
continue in effect for a term of ten (10) years unless sooner terminated under
Section 15 of the Plan.

         7. Term of Option. The term of each Option shall be the term stated in
the Option Agreement; provided, however, that the term shall be no more than ten
(10) years from the date of grant thereof or such shorter term as may be
provided in the Option Agreement. However, in the case of an Option granted to
an Optionee who, at the time the Option is granted, owns stock representing more
than ten percent (10%) of the voting power of all classes of stock of the
Company or any Parent or Subsidiary, the term of the Option shall be five (5)
years from the date of grant thereof or such shorter term as may be provided in
the Option Agreement.

         8. Limitation on Grants to Employees. Subject to adjustment as provided
in Section 13 of this Plan, the maximum number of shares which may be subject to
Options granted to any one employee under this Plan for any fiscal year of the
Company shall be 750,000.



                                      -5-
<PAGE>   6

         9.       Option Exercise Price and Consideration.

                  (a) Exercise Price. The per share exercise price for the
Shares to be issued pursuant to exercise of an Option shall be such price as is
determined by the Board, but shall be subject to the following:

                            (i) In the case of an Incentive Stock Option

                                    (A) granted to an Employee who, at the time
of the grant of such Incentive Stock Option, owns stock representing more than
ten percent (10%) of the voting power of all classes of stock of the Company or
any Parent or Subsidiary, the per Share exercise price shall be no less than
110% of the Fair Market Value per Share on the date of grant.

                                    (B) granted to any other Employee, the per 
Share exercise price shall be no less than 100% of the Fair Market Value per
Share on the date of grant.

                            (ii) In the case of a Nonstatutory Stock Option

                                    (A) granted to a person who, at the time of
the grant of such Option, owns stock representing more than ten percent (10%) of
the voting power of all classes of stock of the Company or any Parent or
Subsidiary, the per Share exercise price shall be no less than 110% of the Fair
Market Value per Share on the date of the grant.

                                    (B) granted to a person, who, at the time of
grant of such Option is a Named Executive of the Company, the per share exercise
price shall be no less than 100% of the Fair Market Value on the date of grant.

                                    (C) granted to any person other than those 
persons described in subsections (ii) (A) and (B) above, the per Share exercise
price shall be no less than 85% of the Fair Market Value per Share on the date
of grant.

                  (b) Permissible Consideration. The consideration to be paid
for the Shares to be issued upon exercise of an Option, including the method of
payment, shall be determined by the Administrator (and, in the case of an
Incentive Stock Option, shall be determined at the time of grant) and may
consist entirely of (1) cash, (2) check, (3) promissory note, (4) other Shares
that (x) in the case of Shares acquired upon exercise of an Option, have been
owned by the Optionee for more than six months on the date of surrender, and (y)
have a Fair Market Value on the date of surrender equal to the aggregate
exercise price of the Shares as to which such Option shall be exercised, (5)
authorization from the Company to retain from the total number of Shares as to
which the Option is exercised that number of Shares having a Fair Market Value
on the date of exercise equal to the exercise price for the total number of
Shares as to which the Option is exercised, (6) delivery of a properly executed
exercise notice together with such other documentation as the Administrator and
the broker, if applicable, shall require to effect an exercise of the Option and
delivery to the Company of the sale or loan proceeds required to pay the
exercise price, (7) delivery of a subscription agreement for the Shares that
irrevocably obligates the option 


                                      -6-
<PAGE>   7

holder to take and pay for the Shares not more than twelve months after the date
of delivery of the subscription agreement, (8) any combination of the foregoing
methods of payment, or (9) such other consideration and method of payment for
the issuance of Shares to the extent permitted under Applicable Laws. In making
its determination as to the type of consideration to accept, the Board shall
consider if acceptance of such consideration may be reasonably expected to
benefit the Company.

         10.      Exercise of Option.

                  (a) Procedure for Exercise; Rights as a Shareholder. Any
Option granted hereunder shall be exercisable at such times and under such
conditions as determined by the Board, including performance criteria with
respect to the Company and/or the Optionee, and as shall be permissible under
the terms of the Plan.

                  An Option may not be exercised for a fraction of a Share.

                  An Option shall be deemed to be exercised when written notice
of such exercise has been given to the Company in accordance with the terms of
the Option by the person entitled to exercise the Option and the Company has
received full payment for the Shares with respect to which the Option is
exercised. Full payment may, as authorized by the Board, consist of any
consideration and method of payment allowable under Section 9(b) of the Plan.
Until the issuance (as evidenced by the appropriate entry on the books of the
Company or of a duly authorized transfer agent of the Company) of the stock
certificate evidencing such Shares, no right to vote or receive dividends or any
other rights as a shareholder shall exist with respect to the Optioned Stock,
notwithstanding the exercise of the Option. The Company shall issue (or cause to
be issued) such stock certificate promptly upon exercise of the Option. No
adjustment will be made for a dividend or other right for which the record date
is prior to the date the stock certificate is issued, except as provided in
Section 13 of the Plan.

                  Exercise of an Option in any manner shall result in a decrease
in the number of Shares which thereafter may be available, both for purposes of
the Plan and for sale under the Option, by the number of Shares as to which the
Option is exercised.

                  (b) Termination of Employment. In the event of termination of
an Optionee's consulting relationship or Continuous Status as an Employee with
the Company, such Optionee may, but only within three (3) months (or such other
period of time as is determined by the Board, with such determination in the
case of an Incentive Stock Option being made at the time of grant of the Option
and not exceeding three (3) months) after the date of such termination (but in
no event later than the expiration date of the term of such Option as set forth
in the Option Agreement), exercise his or her Option to the extent that Optionee
was entitled to exercise it at the date of such termination. To the extent that
Optionee was not entitled to ,exercise the Option at the date of such
termination, or if Optionee does not exercise such Option to the extent so
entitled within the time specified herein, the Option shall terminate.



                                      -7-
<PAGE>   8

                  (c) Disability of Optionee. Notwithstanding the provisions of
Section 10(b) above, in the event of termination of an Optionee's consulting
relationship or Continuous Status as an Employee as a result of his or her total
and permanent disability (within the meaning of Section 22(e)(3) of the Code),
Optionee may, but only within twelve (12) months from the date of such
termination (but in no event later than the expiration date of the term of such
Option as set forth in the Option Agreement), exercise the Option to the extent
otherwise entitled to exercise it at the date of such termination. To the extent
that Optionee was not entitled to exercise the Option at the date of
termination, or if Optionee does not exercise such Option to the extent so
entitled within the time specified herein, the Option shall terminate.

                  (d) Death of Optionee. In the event of the death of an
Optionee, the Option may be exercised, at any time within twelve (12) months
following the date of death (but in no event later than the expiration date of
the term of such Option as set forth in the Option Agreement), by the Optionee's
estate or by a person who acquired the right to exercise the Option by bequest
or inheritance, but only to the extent the Optionee was entitled to exercise the
Option at the date of death. To the extent that the Optionee was not entitled to
exercise the Option at the date of termination, or if Optionee does not exercise
such Option to the extent so entitled within the time specified herein, the
Option shall terminate.

                  (e) Rule 16b-3. Options granted to persons subject to Section
16(b) of the Exchange Act must comply with Rule 16b-3 and shall contain such
additional conditions or restrictions as may be required thereunder to qualify
for the maximum exemption from Section 16 of the Exchange Act with respect to
Plan transactions.

                  (f) Buyout Provisions. The Administrator may at any time offer
to buy out for a payment in cash or Shares, an Option previously granted, based
on such terms and conditions as the Administrator shall establish and
communicate to the Optionee at the time that such offer is made.

         11. Non-Transferability of Options. The Option may not be sold,
pledged, assigned, hypothecated, transferred, or disposed of in any manner other
than by will or by the laws of descent or distribution and may be exercised,
during the lifetime of the Optionee, only by the Optionee.

         12. Stock Withholding to Satisfy Withholding Tax Obligation. At the
discretion of the Administrator. Optionees may satisfy withholding obligations
as provided in this paragraph. When an Optionee incurs tax liability in
connection with an Option, which tax liability is subject to tax withholding
under applicable tax laws, and the Optionee is obligated to pay the Company an
amount required to be withheld under applicable tax laws, the Optionee may
satisfy the withholding tax obligation by electing to have the Company withhold
from the Shares to be issued upon exercise of the Option that number of Shares
having a Fair Market Value equal to the amount required to be withheld. The Fair
Market Value of the Shares to be withheld shall be determined on the date that
the amount of tax to be withheld is to be determined (the "Tax Date").

         All elections by an Optionee to have Shares withheld for this purpose
shall be made in writing in a form acceptable to the Administrator and shall be
subject to the following restrictions:



                                      -8-
<PAGE>   9

                  (a) the election must be made on or prior to the applicable
Tax Date;

                  (b) once made, the election shall be irrevocable as to the
particular Shares of the Option as to which the election is made;

                  (c) all elections shall be subject to the consent or
disapproval of the Administrator;

                  (d) if the Optionee is subject to Section 16 of the Exchange
Act, the election must comply with the applicable provisions of Rule 16b-3 and
shall be subject to such additional conditions or restrictions as may be
required thereunder to qualify for the maximum exemption from Section 16 of the
Exchange Act with respect to Plan transactions.

         In the event the election to have Shares withheld is made by an
Optionee and the Tax Date is deferred under Section 83 of the Code because no
election is filed under Section 83(b) of the Code, the Optionee shall receive
the full number of Shares with respect to which the Option or Stock Purchase
Right is exercised but, such Optionee shall be unconditionally obligated to
tender back to the Company the proper number of Shares on the Tax Date.

         13. Adjustments Upon Changes in Capitalization; Corporate Transactions.

                  (a) Changes in Capitalization. Subject to any required action
by the shareholders of the Company, the number of shares of Common Stock covered
by each outstanding Option, and the number of shares of Common Stock that have
been authorized for issuance under the Plan but as to which no Options have yet
been granted or that have been returned to the Plan upon cancellation or
expiration of an Option, the maximum number of shares of Common Stock for which
Options may be granted to any employee under Section 8 of the Plan and the price
per share of Common Stock covered by each such outstanding Option, shall be
proportionately adjusted for any increase or decrease in the number of issued
shares of Common Stock resulting from a stock split, reverse stock split, stock
dividend, combination or reclassification of the Common Stock, or any other
increase or decrease in the number of issued shares of Common Stock effected
without receipt of consideration by the Company; provided, however, that
conversion of any convertible securities of the Company shall not be deemed to
have been "effected without receipt of consideration." Such adjustment shall be
made by the Board, whose determination in that respect shall be final, binding
and conclusive. Except as expressly provided herein, no issuance by the Company
of shares of stock of any class, or securities convertible into shares of stock
of any class, shall affect, and no adjustment by reason thereof shall be made
with respect to, the number or price of shares of Common Stock subject to an
Option.

                  (b) Corporate Transactions. In the event of the proposed
dissolution or liquidation of the Company, the Board shall notify the Optionee
at least fifteen (15) days prior to such proposed action. To the extent it has
not been previously exercised, the Option will terminate immediately prior to
the consummation of such proposed action. In the event of a proposed sale of all
or substantially all of the assets of the Company, or the merger of the Company
with or into another corporation, the Option may be assumed or an equivalent
option may be substituted by such 



                                      -9-
<PAGE>   10

successor corporation or a parent or subsidiary of such successor corporation.
If the successor corporation does not agree to assume the Option or substitute
an equivalent option, the Board shall notify the Optionee at least fifteen (15)
days prior to the consummation of the transaction. To the extent it has not been
previously exercised, the Option will terminate immediately prior to the
consummation of such transaction.

         14. Time of Granting Options. The date of grant of an Option shall, for
all purposes, be the date on which the Administrator makes the determination
granting such Option, or such other date as is determined by the Board. Notice
of the determination shall be given to each Employee or Consultant to whom an
Option is so granted within a reasonable time after the date of such grant.

         15. Amendment and Termination of the Plan.

                  (a) Amendment and Termination. The Board may amend or
terminate the Plan from time to time in such respects as the Board may deem
advisable; provided that, the following revisions or amendments shall require
approval of the shareholders of the Company in the manner described in Section
19 of the Plan:

                           (i) any increase in the number of Shares subject to
                  the Plan, other than an adjustment under Section 13 of the
                  Plan;

                           (ii) any change in the designation of the class of
                  persons eligible to be granted Options;

                           (iii) any change in the limitation on grants to
                  employees as described in Section 8 of the Plan or other
                  changes which would require shareholder approval to qualify
                  options granted hereunder as performance-based compensation
                  under Section 162(m) of the Code; or

                           (iv) any revision or amendment requiring shareholder
                  approval in order to preserve the qualification of the Plan
                  under Rule 16b-3.

                  (b) Shareholder Approval. If any amendment requiring
shareholder approval under Section 16(a) of the Plan is made subsequent to the
first registration of any class of equity securities by the Company under
Section 12 of the Exchange Act, such shareholder approval shall be solicited as
described in Section 19 of the Plan.

                  (c) Effect of Amendment or Termination. Any such amendment or
termination of the Plan shall not affect Options already granted and such
Options shall remain in full force and effect as if this Plan had not been
amended or terminated, unless mutually agreed otherwise between the Optionee and
the Board, which agreement must be in writing and signed by the Optionee and the
Company.

         16. Conditions Upon Issuance of Shares. Shares shall not be issued
pursuant to the exercise of an Option unless the exercise of such Option and the
issuance and delivery of such 



                                      -10-
<PAGE>   11

Shares pursuant thereto shall comply with all relevant provisions of law,
including, without limitation, the Securities Act of 1933, as amended, the
Exchange Act, the rules and regulations promulgated thereunder, and the
requirements of any stock exchange upon which the Shares may then be listed, and
shall be further subject to the approval of counsel for the Company with respect
to such compliance.

                  As a condition to the exercise of an Option, the Company may
require the person exercising such Option to represent and warrant at the time
of any such exercise that the Shares are being purchased only for investment and
without any present intention to sell or distribute such Shares if, in the
opinion of counsel for the Company, such a representation is required by any of
the aforementioned relevant provisions of law.

         17. Reservation of Shares. The Company, during the term of this Plan,
will at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

                  The inability of the Company to obtain authority from any
regulatory body having jurisdiction, which authority is deemed by the Company's
counsel to be necessary to the lawful issuance and sale of any Shares hereunder,
shall relieve the Company of any liability in respect of the failure to issue or
sell such Shares as to which such requisite authority shall not have been
obtained.

         18. Agreements. Options shall be evidenced by written agreements in
such form as the Board shall approve from time to time.

         19.      Shareholder Approval.

                  (a) Continuance of the Plan shall be subject to approval by
the shareholders of the Company within twelve (12) months before or after the
date the Plan is adopted. Such shareholder approval shall be obtained in the
degree and manner required under applicable state and federal law and the rules
of any stock exchange upon which the Shares are listed.

                  (b) In the event that the Company registers any class of
equity securities pursuant to Section 12 of the Exchange Act, any required
approval of the shareholders of the Company obtained after such registration
shall be solicited substantially in accordance with Section 14(a) of the
Exchange Act and the rules and regulations promulgated thereunder.

                  (c) If any required approval by the shareholders of the Plan
itself or of any amendment thereto is solicited at any time otherwise than in
the manner described in Section 19(b) hereof, then the Company shall, at or
prior to the first annual meeting of shareholders held subsequent to the later
of (1) the first registration of any class of equity securities of the Company
under Section 12 of the Exchange Act or (2) the granting of an Option hereunder
to an officer or director after such registration, do the following:



                                      -11-
<PAGE>   12

                            (i) furnish in writing to the holders entitled to
vote for the Plan substantially the same information that would be required (if
proxies to be voted with respect to approval or disapproval of the Plan or
amendment were then being solicited) by the rules and regulations in effect
under Section 14(a) of the Exchange Act at the time such information is
furnished; and

                            (ii) file with, or mail for filing to, the
Securities and Exchange Commission four copies of the written information
referred to in subsection (i) hereof not later than the date on which such
information is first sent or given to shareholders.

         20. Information to Optionees. The Company shall provide to each
Optionee and individual who acquired shares pursuant to the exercise of an
option, during the period for which such Optionee has one or more Options
outstanding, copies of all annual reports and other information that are
provided to all shareholders of the Company.



                                      -12-
<PAGE>   13


                                     ISOCOR

                             1992 STOCK OPTION PLAN

                          NOTICE OF STOCK OPTION GRANT


Optionee's Name and Address:

Optionee

         You have been granted an option to purchase Common Stock of ISOCOR (the
"Company") as follows:

<TABLE>
<S>                                             <C>
         Board Approval Date:                   BoardApprovalDate

         Date of Grant (Later of Board
                  Approval Date or
                  Commencement of
                  Employment/Consulting):       GrantDate

         Exercise Price Per Share:              ExercisePrice

         Total Number of Shares Granted:        NoofShares

         Total Price of Shares Granted:         TotalExercisePrice

         Type of Option:                        NoSharesISO Shares Incentive 
                                                Stock Option
                                                NoSharesNSO Shares Nonstatutory
                                                Stock Option

         Term/Expiration Date:                  ExpirDate

         Vesting Commencement Date:             VestingStartDate

         Vesting Schedule:                      Vesting

        Termination Period:                     Option may be exercised for a
                                                period of 45 days after
                                                termination of employment or
                                                consulting relationship except
                                                as set out in Sections 7 and 8
                                                of the Stock Option Agreement
                                                (but in no event later than the
                                                Expiration Date).
 </TABLE>

         By your signature and the signature of the Company's representative
below, you and the Company agree that this Option is granted under and governed
by the terms and conditions of the ISOCOR 1992 Stock Option Plan and the Stock
Option Agreement, all of which are attached and made a part of this document.

OPTIONEE:                              ISOCOR
                                       By:
- ---------------------------------          -------------------------------------
Signature

                                       Title:
- ---------------------------------          -------------------------------------
Print Name


<PAGE>   14

                                     ISOCOR

                             STOCK OPTION AGREEMENT

         1. GRANT OF OPTION. ISOCOR, a California corporation (the "Company"),
hereby grants to the Optionee named in the Notice of Stock Option Grant attached
to this Agreement ("Optionee"), an option (the "Option") to purchase the total
number of shares of Common Stock (the "Shares") set forth in the Notice of Stock
Option Grant, at the exercise price per share set forth in the Notice of Stock
Option Grant (the "Exercise Price") subject to the terms, definitions and
provisions of the 1992 Stock Option Plan (the "Plan") adopted by the Company,
which is incorporated in this Agreement by reference. In the event of a conflict
between the terms of the Plan and the terms of this Agreement, the terms of the
Plan shall govern. Unless otherwise defined in this Agreement, the terms used in
this Agreement shall have the meanings defined in the Plan.

         To the extent designated an Incentive Stock Option in the Notice of
Stock Option Grant, this Option is intended to qualify as an Incentive Stock
Option as defined in Section 422 of the Internal Revenue Code of 1986, as
amended (the "Code") and, to the extent not so designated, this Option is
intended to be a Nonstatutory Stock Option.

         2. EXERCISE OF OPTION. This Option shall be exercisable during its term
in accordance with the Vesting Schedule set out in the Notice of Stock Option
Grant and with the provisions of Sections 9 and 10 of the Plan as follows:

                  (a)      RIGHT TO EXERCISE.

                            (i) This Option may not be exercised for a fraction
of a share.

                            (ii) In the event of Optionee's death, disability or
other termination of employment, the exercisability of the Option is governed by
Sections 6, 7 and 8 below, subject to the limitations contained in paragraphs
(iii) and (iv) below.

                            (iii) In no event may this Option be exercised after
the date of expiration of the term of this Option as set forth in the Notice of
Stock Option Grant.

                            (iv) If designated an Incentive Stock Option in the
Notice of Stock Option Grant, in the event that the Shares subject to this
Option (and all other Incentive Stock Options granted to Optionee by the Company
or any Parent or Subsidiary) that vest in any calendar year have an aggregate
fair market value (determined for each Share as of the Date of Grant of the
option covering such Share) in excess of $100,000, the Shares in excess of
$100,000 shall be treated as subject to a Nonstatutory Stock Option, in
accordance with Section 5 of the Plan.

                  (b)      METHOD OF EXERCISE.

                            (i) This Option shall be exercisable by delivering
to the Company a written notice of exercise (in the form attached as Exhibit A)
which shall state the election to 


<PAGE>   15

exercise the Option, the number of Shares in respect of which the Option is
being exercised, and such other representations and agreements as to the
holder's investment intent with respect to such Shares of Common Stock as may be
required by the Company pursuant to the provisions of the Plan. Such written
notice shall be signed by Optionee and shall be delivered in person or by
certified mail to the Stock Option Administrator of the Company. The written
notice shall be accompanied by payment of the exercise price. This Option shall
be deemed to be exercised upon receipt by the Company of such written notice
accompanied by the exercise price.

                            (ii) As a condition to the exercise of this Option,
Optionee agrees to make adequate provision for federal, state or other tax
withholding obligations, if any, which arise upon the exercise of the Option or
disposition of Shares, whether by withholding, direct payment to the Company, or
otherwise.

                            (iii) No Shares will be issued pursuant to the
exercise of an Option unless such issuance and such exercise shall comply with
all relevant provisions of law and the requirements of any stock exchange upon
which the Shares may then be listed. Assuming such compliance, for income tax
purposes the Shares shall be considered transferred to Optionee on the date on
which the Option is exercised with respect to such Shares.

         3. OPTIONEE'S REPRESENTATIONS. In the event the Shares purchasable
pursuant to the exercise of this Option have not been registered under the
Securities Act of 1933, as amended (the "Securities Act"), at the time this
Option is exercised, Optionee shall, if required by the Company, concurrently
with the exercise of all or any portion of this Option, deliver to the Company
an investment representation statement in customary form, a copy of which is
available for Optionee's review from the Company upon request.

         4. METHOD OF PAYMENT. Payment of the exercise price shall be by any of
the following, or a combination of the following, at the election of Optionee:
(a) cash; (b) check; (c) surrender of other shares of Common Stock of the
Company that (i) either have been owned by Optionee for more than six (6) months
on the date of surrender or were not acquired, directly or indirectly, from the
Company, or (ii) have a Fair Market Value on the date of surrender equal to the
aggregate exercise price of the Shares as to which said Option shall be
exercised; or (d) if there is a public market for the Shares and they are
registered under the Securities Act, delivery of a properly executed exercise
notice together with irrevocable instructions to a broker to deliver promptly to
the Company the amount of sale or loan proceeds required to pay the exercise
price.

         5. RESTRICTIONS ON EXERCISE. This Option may not be exercised until
such time as the Plan has been approved by the shareholders of the Company, or
if the issuance of such Shares upon such exercise or the method of payment of
consideration for such shares would constitute a violation of any applicable
federal or state securities or other law or regulation, including any rule under
Part 207 of Title 12 of the Code of Federal Regulations ("Regulation G") as
promulgated by the Federal Reserve Board. As a condition to the exercise of this
Option, the Company may require Optionee to make any representation and warranty
to the Company as may be required by any applicable law or regulation.



                                      -2-
<PAGE>   16

         6. TERMINATION OF RELATIONSHIP. In the event of termination of
Optionee's Continuous Status as an Employee or termination of Optionee's
consulting relationship with the Company, Optionee may, to the extent otherwise
so entitled at the date of such termination (the "Termination Date"), exercise
this Option during the Termination Period set out in the Notice of Stock Option
Grant. To the extent that Optionee was not entitled to exercise this Option at
the date of such termination, or if Optionee does not exercise this Option
within the time specified in the Notice of Stock Option Grant, the Option shall
terminate.

         7. DISABILITY OF OPTIONEE. Notwithstanding the provisions of Section 6
above, in the event of termination of Optionee's Continuous Status as an
Employee or termination of Optionee's consulting relationship with the Company
as a result of total and permanent disability (as defined in Section 22(e)(3) of
the Code), Optionee may, but only within twelve (12) months from the date of
termination of employment or consultancy (but in no event later than the date of
expiration of the term of this Option as set forth in Section 10 below),
exercise the Option to the extent otherwise so entitled at the date of such
termination. To the extent that Optionee was not entitled to exercise the Option
at the date of termination, or if Optionee does not exercise such Option (to the
extent otherwise so entitled) within the time specified in this Agreement, the
Option shall terminate.

         8. DEATH OF OPTIONEE. In the event of the death of Optionee, the Option
may be exercised, at any time within six (6) months following the date of death
(but in no event later than the date of expiration of the term of this Option as
set forth in Section 10 below), by Optionee's estate or by a person who acquired
the right to exercise the Option by bequest or inheritance, but only to the
extent of the right to exercise that had accrued at the date of death.

         9. NON-TRANSFERABILITY OF OPTION. This Option may not be transferred in
any manner otherwise than by will or by the laws of descent or distribution. The
designation of a beneficiary does not constitute a transfer. An Option may be
exercised during the lifetime of Optionee only by Optionee or a transferee
permitted by this section. The terms of this Option shall be binding upon the
executors, administrators, heirs, successors and assigns of Optionee.

         10. TERM OF OPTION. This Option may be exercised only within the term
set out in the Notice of Stock Option Grant, and may be exercised during such
term only in accordance with the Plan and the terms of this Option.

         11. NO ADDITIONAL EMPLOYMENT RIGHTS. Optionee understands and agrees
that the vesting of Shares pursuant to the Vesting Schedule is earned only by
continuing as an Employee or Consultant at the will of the Company (not through
the act of being hired, being granted this Option or acquiring Shares under this
Agreement). Optionee further acknowledges and agrees that nothing in this
Agreement, nor in the Plan which is incorporated in this Agreement by reference,
shall confer upon Optionee any right with respect to continuation as an Employee
or Consultant with the Company, nor shall it interfere in any way with his or
her right or the Company's right to terminate his or her employment or
consulting relationship at any time, with or without cause.



                                      -3-
<PAGE>   17

         12. TAX CONSEQUENCES. Optionee acknowledges that he or she has read the
brief summary set forth below of certain federal tax consequences of exercise of
this Option and disposition of the Shares under the law in effect as of the date
of grant. OPTIONEE UNDERSTANDS THAT THIS SUMMARY IS NECESSARILY INCOMPLETE, AND
THE TAX LAWS AND REGULATIONS ARE SUBJECT TO CHANGE. OPTIONEE SHOULD CONSULT HIS
OR HER OWN TAX ADVISER BEFORE EXERCISING THIS OPTION OR DISPOSING OF THE SHARES.

                  (a) EXERCISE OF INCENTIVE STOCK OPTION. If this Option is an
Incentive Stock Option, there will be no regular federal income tax liability
upon the exercise of the Option, although the excess, if any, of the fair market
value of the Shares on the date of exercise over the Exercise Price will be
treated as an item of alternative minimum taxable income for federal tax
purposes and may subject Optionee to the alternative minimum tax in the year of
exercise.

                  (b) EXERCISE OF NONSTATUTORY STOCK OPTION. If this Option does
not qualify as an Incentive Stock Option, Optionee may incur regular federal
income tax liability upon the exercise of the Option. Optionee will be treated
as having received compensation income (taxable at ordinary income tax rates)
equal to the excess, if any, of the fair market value of the Shares on the date
of exercise over the exercise price. In addition, if Optionee is an employee of
the Company, the Company will be required to withhold from Optionee's
compensation or collect from Optionee and pay to the applicable taxing
authorities an amount equal to a percentage of this compensation income at the
time of exercise.

                  (c) DISPOSITION OF SHARES. If this Option is an Incentive
Stock Option and if Shares transferred pursuant to the Option are held for more
than one year after exercise and more than two years after the Date of Grant,
any gain realized on disposition of the Shares will be treated as long-term
capital gain for federal income tax purposes. If Shares purchased under an
Incentive Stock Option are disposed of before the end of either of such two
holding periods, then any gain realized on such disposition will be treated as
compensation income (taxable at ordinary income rates) to the extent of the
excess, if any, of the lesser of (i) the fair market value of the Shares on the
date of exercise, or (ii) the sales proceeds, over the exercise price. If this
Option is a Nonstatutory Stock Option, then gain realized on the disposition of
Shares will be treated as long-term or short-term capital gain depending on
whether or not the disposition occurs more than one year after the exercise
date. In the case of either an Incentive Stock Option or a Nonstatutory Stock
Option, the long-term capital gain will be taxed for federal income tax and
alternative minimum tax purposes at a maximum rate of 28% if the Shares are held
more than one year but less than 18 months after exercise and at 20% if the
Shares are held more than 18 months after exercise.

                  (d) NOTICE OF DISQUALIFYING DISPOSITION. If the Option granted
to Optionee in this Agreement is an Incentive Stock Option, and if Optionee
sells or otherwise disposes of any of the Shares acquired pursuant to the
Incentive Stock Option on or before the later of (i) the date two years after
the Date of Grant, or (ii) the date one year after transfer of such Shares to
Optionee upon exercise of the Incentive Stock Option, Optionee shall notify the
Company in writing within thirty (30) days after the date of any such
disposition. Optionee agrees that 



                                      -4-
<PAGE>   18

Optionee may be subject to income tax withholding by the Company on the
compensation income recognized by Optionee from the early disposition by payment
in cash or out of the current earnings paid to Optionee.

         13. DEFINITION OF CHANGE OF CONTROL. "Change of Control" shall mean the
occurrence of any of the following events:

                  (i) OWNERSHIP. Any "person" (as such term is used in Sections
13(d) and 14(d) of the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), is or becomes the "beneficial owner" (as defined in Rule 13d-3
under the Exchange Act), directly or indirectly, of securities of the Company
representing 50% or more of the total voting power represented by the Company's
then outstanding voting securities; or

                  (ii) MERGER/SALE OF ASSETS. The stockholders of the Company
approve a merger or consolidation of the Company with any other corporation,
other than a merger or consolidation which would result in the voting securities
of the Company outstanding immediately prior thereto continuing to represent
(either by remaining outstanding or by being converted into voting securities of
the surviving entity) at least 50% of the total voting power represented by the
voting securities of the Company or such surviving entity outstanding
immediately after such merger or consolidation, or the shareholders of the
Company approve a plan of complete liquidation of the Company or an agreement
for the sale or disposition by the Company of all or substantially all of the
Company's assets.

         14. SIGNATURE. This Stock Option Agreement shall be deemed executed by
the Company and Optionee upon execution by such parties of the Notice of Stock
Option Grant attached to this Stock Option Agreement.


                  [Remainder of page left intentionally blank]



                                      -5-
<PAGE>   19

                                    EXHIBIT A

                               NOTICE OF EXERCISE

To:               ISOCOR
Attn:             Stock Option Administrator
Subject:          Notice of Intention to Exercise Stock Option

         This is official notice that the undersigned ("Optionee") intends to
exercise Optionee's option to purchase __________ shares of ISOCOR Common Stock,
under and pursuant to the Company's 1992 Stock Option Plan and the Notice of
Stock Option Grant and Stock Option Agreement dated ___________, as follows:

                  Date of Grant :               ________________________________

                  Number of Shares:             ________________________________

                  Purchase Price:               ________________________________

                  Method of Payment
                  of Purchase Price:            ________________________________


         Social Security No.:       ________________________________

         The shares should be issued as follows:

                  Name:       __________________________

                  Address:    __________________________

                              __________________________

                              __________________________

                  Signed:     __________________________

                  Date:       __________________________




<PAGE>   1

                                                                     EXHIBIT 5.1

                            [VENTURE LAW GROUP LOGO]



                                August 11, 1998


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 August 10, 1998 (the
"Registration Statement") in connection with the registration under the
Securities Act of 1933, as amended, of a total of 350,000 shares of your Common
Stock (the "Shares") reserved for issuance under the 1992 Stock Option Plan (the
"Plan"). 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 Plan.

         It is our opinion that, when issued and sold in the manner referred to
in the Plan and pursuant to the respective agreement which accompanies each
grant under the Plan, 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
                                        A Professional Corporation
           
                                        /s/ VENTURE LAW GROUP


EJB



<PAGE>   1

                                                                    EXHIBIT 23.2

                        CONSENT OF INDEPENDENT AUDITORS



We consent to the incorporation by reference in this Registration Statement on
Form S-8 (File No. 333-05275) of our report dated February 18, 1998 on our
audits of the consolidated financial statements of ISOCOR as of December 31,
1997 and 1996 and for the years ended December 31, 1997, 1996 and 1995, which
report appears in ISOCOR's Annual Report on Form 10-K (File No. 000-27900) for
the year ended December 31, 1997, filed with the Securities and Exchange
Commission pursuant to the Securities Act of 1934.

/s/ PricewaterhouseCoopers LLP
- ---------------------------------

PRICEWATERHOUSECOOPERS LLP
Los Angeles, California
August 4, 1998




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