ISOCOR
S-8, 1999-11-09
PREPACKAGED SOFTWARE
Previous: AUTOCAM CORP/MI, 8-K, 1999-11-09
Next: STRONG SHORT TERM MUNICIPAL BOND FUND INC, 24F-2NT, 1999-11-09



<PAGE>   1

        As filed with the Securities and Exchange Commission on November 8, 1999
                                                 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                                    95-4310259
  -------------------------------           ------------------------------------
  (State or other jurisdiction of           (I.R.S. Employer Identification No.)
  incorporation or organization)


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

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

                        1996 EMPLOYEE STOCK PURCHASE PLAN
                             1999 STOCK OPTION PLAN
                            (Full title of the Plans)

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

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

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

                             -----------------------
                                    Copy to:

                                  Sanjay Khare
                                Venture Law Group
                           A Professional Corporation
                               2800 Sand Hill Road
                          Menlo Park, California 94025
                                 (650) 854-4488

               (Calculation of Registration Fee on following page)

<PAGE>   2

- --------------------------------------------------------------------------------
                         CALCULATION OF REGISTRATION FEE
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                             Maximum        Proposed Maximum     Proposed Maximum      Amount of
                                          Amount to be       Offering Price          Aggregate        Registration
Title of Securities to be Registered      Registered(1)         Per Share         Offering Price          Fee
- ------------------------------------     --------------     ----------------     ----------------     ------------
<S>                                      <C>                <C>                  <C>                  <C>
1996 EMPLOYEE STOCK PURCHASE PLAN
   Common Stock,
   no par value.....................     250,000 Shares        $17.625(2)         $ 4,406,250.00       $1,225.00


1999 STOCK OPTION PLAN
   Common Stock,
   no par value.....................     123,500 Shares        $  8.11(3)         $ 1,001,585.00       $  279.00

   Common Stock,
   no par value.....................     526,500 Shares        $17.625(4)         $ 9,279,562.50       $2,580.00

                 TOTAL                   900,000 Shares                           $14,687,397.50       $4,084.00
                 -----
</TABLE>

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

(1) This Registration Statement shall also cover any additional shares of Common
    Stock which become issuable under any of the plans being registered pursuant
    to this Registration Statement by reason of any stock dividend, stock split,
    recapitalization or any other similar transaction effected without the
    receipt of consideration which results in an increase in the number of the
    Registrant's outstanding shares of Common Stock.

(2) Estimated in accordance with Rule 457(h) under the Securities Act of 1933
    (the "Securities Act") solely for the purpose of calculating the
    registration fee. The computation is based upon the average of the high and
    low sale prices of the Common Stock as reported on The Nasdaq National
    Market on November 2, 1999, as specified under Rule 457(c) under the
    Securities Act, multiplied by 85%, which is the percentage of the trading
    purchase price applicable to purchases under the referenced plan.

(3) Computed in accordance with Rule 457(h) under the Securities Act solely for
    the purpose of calculating the registration fee. Computation based on the
    weighted average per share exercise price (rounded to nearest cent) of
    outstanding options under the referenced plan, the shares issuable under
    which are registered hereby.

(4) Estimated in accordance with Rule 457(h) under the Securities Act solely for
    the purpose of calculating the registration fee. The computation with
    respect to unissued options is based upon the average high and low sale
    prices of the Common Stock as reported on the Nasdaq National Market on
    November 2, 1999, as specified under Rule 457(c) under the Securities Act.


                                      -2-
<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. In addition, 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 are hereby incorporated by reference:

        ITEM 3(a)

        The Registrant's Annual Report on Form 10-K filed on March 30, 1999
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 12, 1999
pursuant to Rule 13(a) of the Exchange Act.

        The Registrant's Quarterly Report on Form 10-Q filed on August 13, 1999
pursuant to Rule 13(a) of 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.

Item 4. DESCRIPTION OF SECURITIES. Not applicable.

Item 5. INTERESTS OF NAMED EXPERTS AND COUNSEL. Not applicable.

Item 6. INDEMNIFICATION OF DIRECTORS AND OFFICERS.

        The Registrant's Articles of Incorporation reduce the liability of a
director to the corporation or its shareholders for monetary damages for
breaches of his or her fiduciary duty of care to the fullest extent permissible
under California law. The Bylaws of the Registrant further provide for
indemnification of corporate agents to the maximum extent permitted by the
California General Corporation Law. In addition, the Registrant has entered into
Indemnification Agreements with its officers and directors.

Item 7. EXEMPTION FROM REGISTRATION CLAIMED. Not applicable.

Item 8. EXHIBITS.


                                      -3-
<PAGE>   4

<TABLE>
<CAPTION>
Exhibit
Number
- -------
<S>          <C>
  4.1        1996 Employee Stock Purchase Plan
  4.2        1999 Stock Option Plan
  4.3        Form of 1999 Stock Option Plan Stock Option Agreement
  5.1        Opinion of Venture Law Group, A Professional Corporation.
 23.1        Consent of Venture Law Group, A Professional Corporation (included in Exhibit 5.1).
 23.2        Consent of Independent Accountants (see p. 7).
 24.1        Powers of Attorney (see p. 6).
</TABLE>

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


                                      -4-
<PAGE>   5

Item 9. UNDERTAKINGS.

        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 purposes 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.

        The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act, each filing of the
Registrant's annual report pursuant to Section 13(a) or 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.

        Insofar as the indemnification for liabilities arising under the
Securities 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 Commission such
indemnification is against public policy as expressed in the Securities 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 a successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered hereunder, the Registrant will, unless in the opinion of its counsel
the question has already been settled by controlling precedent, submit to a
court of appropriate jurisdiction the question of whether such indemnification
by it is against public policy as expressed in the Securities Act and will be
governed by the final adjudication of such issue.

                            [Signature Pages Follow]


                                      -5-
<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 8th
day of November, 1999.

                                            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 Director      November 8, 1999
- -----------------------------      (Principal Executive Officer)
         (Paul Gigg)

   /s/ Janine M. Bushman           Vice President, Finance and Administration,          November 8, 1999
- -----------------------------      Chief Financial Officer and Director
      (Janine M. Bushman)          (Principal Financial and Accounting Officer)

     /s/ Dennis Cagan              Director                                             November 8, 1999
- -----------------------------
        (Dennis Cagan)

     /s/ Andre DeFusco             Director                                             November 8, 1999
- -----------------------------
        (Andre DeFusco)

    /s/ Andrew De Mari             Chairman of the Board of Directors and Director      November 8, 1999
- -----------------------------
       (Andrew De Mari)

    /s/ G. Bradford Jones          Director                                             November 8, 1999
- -----------------------------
       (G. Bradford Jones)

     /s/ William Yundt             Director                                             November 8, 1999
- -----------------------------
        (William Yundt)
</TABLE>


                                      -6-
<PAGE>   7

                       CONSENT OF INDEPENDENT ACCOUNTANT'S

We consent to the incorporation by reference in this Registration Statement on
Form S-8 of our report February 10, 1999 relating to the consolidated financial
statements, which appears in the 1998 Annual Report to Shareholders of ISOCOR,
which is incorporated by refenrece in ISCOOR's Annual Report on Form 10-K for
the year ended December 31, 1998.

PRICEWATERHOUSECOOPERS, L.L.P.
Woodland Hills, California
November 2, 1999

<PAGE>   8

                                INDEX TO EXHIBITS

<TABLE>
<CAPTION>
Exhibit
Number
- ------
<S>       <C>
  4.1     1996 Employee Stock Purchase Plan

  4.2     1999 Stock Option Plan

  4.3     Form of 1999 Stock Option Plan Stock Option Agreement

  5.1     Opinion of Venture Law Group, A Professional Corporation

 23.1     Consent of Venture Law Group, A Professional Corporation
          (included in Exhibit 5.1).

 23.2     Consent of Independent Accountants  (see p. 7).

 24.1     Powers of Attorney (see p. 6).
</TABLE>

<PAGE>   1
                                                                     EXHIBIT 4.1

                                     ISOCOR

                        1996 EMPLOYEE STOCK PURCHASE PLAN

           The following constitute the provisions of the 1996 Employee Stock
Purchase Plan of ISOCOR.

        1. Purpose. The purpose of the Plan is to provide employees of the
Company and its Designated Subsidiaries with an opportunity to purchase Common
Stock of the Company. It is the intention of the Company to have the Plan
qualify as an "Employee Stock Purchase Plan" under Section 423 of the Internal
Revenue Code of 1986, as amended. The provisions of the Plan shall, accordingly,
be construed so as to extend and limit participation in a manner consistent with
the requirements of that section of the Code.

        2. Definitions.

                (a) "Board" shall mean the Board of Directors of the Company.

                (b) "Code" shall mean the Internal Revenue Code of 1986, as
amended.

                (c) "Common Stock" shall mean the Common Stock of the Company.

                (d) "Company" shall mean ISOCOR, a California corporation.

                (e) "Compensation" shall mean all regular straight time gross
earnings, payments for overtime, shift premium, incentive compensation,
incentive payments, bonuses, commissions and other cash compensation.

                (f) "Continuous Status as an Employee" shall mean the absence of
any interruption or termination of service as an Employee. Continuous Status as
an Employee shall not be considered interrupted in the case of a leave of
absence agreed to in writing by the Company, provided that such leave is for a
period of not more than 90 days or reemployment upon the expiration of such
leave is guaranteed by contract or statute.

                (g) "Contributions" shall mean all amounts credited to the
account of a participant pursuant to the Plan.

                (h) "Designated Subsidiaries" shall mean the Subsidiaries which
have been designated by the Board from time to time in its sole discretion as
eligible to participate in the Plan.

                (i) "Employee" shall mean any person, including an officer, who
is customarily employed for at least twenty (20) hours per week and more than
five (5) months in a calendar year by the Company or one of its Designated
Subsidiaries.

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


<PAGE>   2


                (k) "Exercise Date" shall mean the last day of each Offering
Period of the Plan.

                (l) "Offering Date" shall mean the first business day of each
Offering Period of the Plan, except that in the case of an individual who
becomes an eligible Employee after the first business day of an Offering Period
but prior to the first business day of the last calendar quarter of such
Offering Period, the term "Offering Date" shall mean the first business day of
the calendar quarter coinciding with or next succeeding the day on which that
individual becomes an eligible Employee.

                Options granted after the first business day of an Offering
Period will be subject to the same terms as the options granted on the first
business day of such Offering Period except that they will have a different
grant date (thus, potentially, a different exercise price) and, because they
expire at the same time as the options granted on the first business day of such
Offering Period, a shorter term.

                (m) "Offering Period" shall mean a period of six (6) months
except for the first offering period as set forth in Section 4.


                (n) "Plan" shall mean this Employee Stock Purchase Plan.

                (o) "Purchase Price" shall mean an amount equal to 85% of the
Fair Market Value (as defined in Section 7(b) below) of a Share of Common Stock
on the Offering Date or on the Purchase Date, whichever is lower; provided,
however, that in the event (i) the Company's stockholders approve an increase in
the number of Shares available for issuance under the Plan, and (ii) all or a
portion of such additional Shares are to be issued with respect to one or more
Offering Periods that are underway at the time of such stockholder approval
("Additional Shares"), and (iii) the Fair Market Value of a Share of Common
Stock on the date of such approval (the "Approval Date Fair Market Value") is
higher than the Fair Market Value on the Offering Date for any such Offering
Period, then in such instance the Purchase Price with respect to Additional
Shares shall be 85% of the Approval Date Fair Market Value or the Fair Market
Value of a Share of Common Stock on the Purchase Date, whichever is lower.

                (p) "Share" shall mean a share of Common Stock, as adjusted in
accordance with Section 18 of the Plan.

                (q) "Subsidiary" shall mean a corporation, domestic or foreign,
of which not less than 50% of the voting shares are held by the Company or a
Subsidiary, whether or not such corporation now exists or is hereafter organized
or acquired by the Company or a Subsidiary.


                                      -2-
<PAGE>   3

        3. Eligibility.

                (a) Any person who has been employed as an Employee for three
(3) months as of the Offering Date of a given Offering Period (except for the
first Offering Period under the Plan, in which case the person shall be an
Employee as of the Offering Date) shall be eligible to participate in such
Offering Period under the Plan, provided that such person was not eligible to
participate in such Offering Period as of any prior Offering Date, and further,
subject to the requirements of Section 5(a) and the limitations imposed by
Section 423(b) of the Code.

                (b) Any provisions of the Plan to the contrary notwithstanding,
no Employee shall be granted an option under the Plan (i) if, immediately after
the grant, such Employee (or any other person whose stock would be attributed to
such Employee pursuant to Section 424(d) of the Code) would own stock and/or
hold outstanding options to purchase stock possessing five percent (5%) or more
of the total combined voting power or value of all classes of stock of the
Company or of any subsidiary of the Company, or (ii) if such option would permit
his or her rights to purchase stock under all employee stock purchase plans
(described in Section 423 of the Code) of the Company and its Subsidiaries to
accrue at a rate which exceeds Twenty Five Thousand Dollars ($25,000) of fair
market value of such stock (determined at the time such option is granted) for
each calendar year in which such option is outstanding at any time.

        4. Offering Periods. The Plan shall be implemented by a series of
Offering Periods, with new Offering Periods commencing on or about January 1 and
July 1 of each year (or at such other time or times as may be determined by the
Board of Directors). The first Offering Period shall commence on July 1, 1996
(or such other date as the Board of Directors shall determine). The Plan shall
continue until terminated in accordance with Section 19 hereof. The Board of
Directors of the Company shall have the power to change the duration and/or the
frequency of Offering Periods with respect to future offerings without
shareholder approval if such change is announced at least ten (10) days prior to
the scheduled beginning of the first Offering Period to be affected.

        5. Participation.

                (a) An eligible Employee may become a participant in the Plan by
completing a subscription agreement on the form provided by the Company and
filing it with the Company's payroll office prior to the applicable Offering
Date, unless a later time for filing the subscription agreement is set by the
Board for all eligible Employees with respect to a given offering. The
subscription agreement shall set forth the percentage of the participant's
Compensation (which shall be not less than 1% and not more than 10%) to be paid
as Contributions pursuant to the Plan.

                (b) Payroll deductions shall commence on the first payroll
following the Offering Date and shall end on the last payroll paid on or prior
to the Exercise Date of the offering to which the subscription agreement is
applicable, unless sooner terminated by the participant as provided in Section
10.


                                      -3-
<PAGE>   4

        6. Method of Payment of Contributions.

                (a) The participant shall elect to have payroll deductions made
on each payday during the Offering Period in an amount not less than one percent
(1%) and not more than ten percent (10%) of such participant's Compensation on
each such payday; provided that the aggregate of such payroll deductions during
the Offering Period shall not exceed ten percent (10%) of the participant's
aggregate Compensation during said Offering Period. All payroll deductions made
by a participant shall be credited to his or her account under the Plan. A
participant may not make any additional payments into such account.

                (b) A participant may discontinue his or her participation in
the Plan as provided in Section 10, or, on one occasion only during the Offering
Period, may decrease the rate of his or her Contributions during the Offering
Period by completing and filing with the Company a new subscription agreement.
The change in rate shall be effective as of the beginning of the calendar
quarter following the date of filing of the new subscription agreement.

                (c) Notwithstanding the foregoing, to the extent necessary to
comply with Section 423(b)(8) of the Code and Section 3(b) herein, a
participant's payroll deductions may be decreased to 0% at such time during any
Offering Period which is scheduled to end during the current calendar year that
the aggregate of all payroll deductions accumulated with respect to such
Offering Period and any other Offering Period ending within the same calendar
year equal $21,250. Payroll deductions shall re-commence at the rate provided in
such participant's subscription agreement at the beginning of the first Offering
Period which is scheduled to end in the following calendar year, unless
terminated by the participant as provided in Section 10.

        7. Grant of Option.

                (a) On the Offering Date of each Offering Period, each eligible
Employee participating in such Offering Period shall be granted an option to
purchase on the Exercise Date a number of shares of the Company's Common Stock
determined by dividing such Employee's Contributions accumulated prior to such
Exercise Date and retained in the participant's account as of the Exercise Date
by the applicable Purchase Price; provided, however, that the maximum number of
shares an Employee may purchase during each Offering Period shall be determined
at the Offering Date by dividing $12,500 by the fair market value of a share of
the Company's Common Stock on the Offering Date, and provided further that such
purchase shall be subject to the limitations set forth in Sections 3(b) and 12.
The fair market value of a share of the Company's Common Stock shall be
determined as provided in Section 7(b).

                (b) The fair market value of the Company's Common Stock on a
given date (the "Fair Market Value") shall be determined by the Board in its
discretion based on the closing price of the Common Stock for such date (or, in
the event that the Common Stock is not traded on such date, on the immediately
preceding trading date), as reported by the National Association of Securities
Dealers Automated Quotation (Nasdaq) National Market or, if such price is not
reported, the mean of the bid and asked prices per share of the Common Stock as
reported by Nasdaq or, in the event the Common Stock is listed on a stock
exchange, the Fair Market Value per share shall be the closing price on such
exchange on such date (or, in the event that the


                                      -4-
<PAGE>   5

Common Stock is not traded on such date, on the immediately preceding trading
date), as reported in The Wall Street Journal.

        8. Exercise of Option. Unless a participant withdraws from the Plan as
provided in paragraph 10, his or her option for the purchase of shares will be
exercised automatically on the Exercise Date of the Offering Period, and the
maximum number of full shares subject to option will be purchased at the
applicable option price with the accumulated Contributions in his or her
account. The shares purchased upon exercise of an option hereunder shall be
deemed to be transferred to the participant on the Exercise Date. During his or
her lifetime, a participant's option to purchase shares hereunder is exercisable
only by him or her.

        9. Delivery. As promptly as practicable after the Exercise Date of each
Offering Period, the Company shall arrange the delivery to each participant, as
appropriate, of a certificate representing the shares purchased upon exercise of
his or her option. Any cash remaining to the credit of a participant's account
under the Plan after a purchase by him or her of shares at the termination of
each Offering Period, or which is insufficient to purchase a full share of
Common Stock of the Company, shall be carried over in the participant's account
and applied to the option price for the succeeding offering period.

        10. Withdrawal; Termination of Employment.

                (a) A participant may withdraw all but not less than all the
Contributions credited to his or her account under the Plan at any time prior to
ten (10) days prior to the Exercise Date of the Offering Period by giving
written notice to the Company. All of the participant's Contributions credited
to his or her account will be paid to him or her promptly after receipt of his
or her notice of withdrawal and his or her option for the current period will be
automatically terminated. No further Contributions for the purchase of shares
will be made during the Offering Period.

                (b) Upon termination of the participant's Continuous Status as
an Employee prior to the Exercise Date of the Offering Period for any reason,
including retirement or death, the Contributions credited to his or her account
will be returned to him or her or, in the case of his or her death, to the
person or persons entitled thereto under Section 14, and his or her option will
be automatically terminated.

                (c) In the event an Employee fails to remain in Continuous
Status as an Employee of the Company for at least twenty (20) hours per week
during the Offering Period in which the employee is a participant, he or she
will be deemed to have elected to withdraw from the Plan and the Contributions
credited to his or her account will be returned to him or her and his or her
option terminated.

                (d) A participant's withdrawal from an offering will not have
any effect upon his or her eligibility to participate in a succeeding offering
or in any similar plan which may hereafter be adopted by the Company.


                                      -5-
<PAGE>   6

        11. Interest. No interest shall accrue on the Contributions of a
participant in the Plan.

        12. Stock.

                (a) The maximum number of shares of the Company's Common Stock
which shall be made available for sale under the Plan shall be 500,000 shares,
subject to adjustment upon changes in capitalization of the Company as provided
in Section 18. If the total number of shares which would otherwise be subject to
options granted pursuant to Section 7(a) on the Offering Date of an Offering
Period exceeds the number of shares then available under the Plan (after
deduction of all shares for which options have been exercised or are then
outstanding), the Company shall make a pro rata allocation of the shares
remaining available for option grant in as uniform a manner as shall be
practicable and as it shall determine to be equitable. In such event, the
Company shall give written notice of such reduction of the number of shares
subject to the option to each Employee affected thereby and shall similarly
reduce the rate of Contributions, if necessary.

                (b) The participant will have no interest or voting right in
shares covered by his or her option until such option has been exercised.

                (c) Shares to be delivered to a participant under the Plan will
be registered in the name of the participant or in the name of the participant
and his or her spouse.

        13. Administration. The Board, or a committee named by the Board, shall
supervise and administer the Plan and shall have full power to adopt, amend and
rescind any rules deemed desirable and appropriate for the administration of the
Plan and not inconsistent with the Plan, to construe and interpret the Plan, and
to make all other determinations necessary or advisable for the administration
of the Plan. The composition of the committee shall be in accordance with the
requirements to obtain or retain any available exemption from the operation of
Section 16(b) of the Exchange Act, pursuant to Rule 16b-3 promulgated
thereunder.

        14. Designation of Beneficiary.

                (a) A participant may file a written designation of a
beneficiary who is to receive any shares and cash, if any, from the
participant's account under the Plan in the event of such participant's death
subsequent to the end of the Offering Period but prior to delivery to him or her
of such shares and cash. In addition, a participant may file a written
designation of a beneficiary who is to receive any cash from the participant's
account under the Plan in the event of such participant's death prior to the
Exercise Date of the Offering Period. If a participant is married and the
designated beneficiary is not the spouse, spousal consent shall be required for
such designation to be effective.

                (b) Such designation of beneficiary may be changed by the
participant (and his or her spouse, if any) at any time by written notice to the
Company. In the event of the death of a participant and in the absence of a
beneficiary validly designated under the Plan who is living at the time of such
participant's death, the Company shall deliver such shares and/or cash to the
executor or administrator of the estate of the participant, or if no such
executor or administrator has been appointed (to the knowledge of the Company),
the Company, in its discretion, may deliver such shares and/or cash to the
spouse or to any one or more dependents or


                                      -6-
<PAGE>   7

relatives of the participant, or if no spouse, dependent or relative is known to
the Company, then to such other person as the Company may designate.

        15. Transferability. Neither Contributions credited to a participant's
account nor any rights with regard to the exercise of an option or to receive
shares under the Plan may be assigned, transferred, pledged or otherwise
disposed of in any way (other than by will, the laws of descent and
distribution, or as provided in Section 14) by the participant. Any such attempt
at assignment, transfer, pledge or other disposition shall be without effect,
except that the Company may treat such act as an election to withdraw funds in
accordance with Section 10.

        16. Use of Funds. All Contributions received or held by the Company
under the Plan may be used by the Company for any corporate purpose, and the
Company shall not be obligated to segregate such Contributions.

        17. Reports. Individual accounts will be maintained for each participant
in the Plan. Statements of account will be given to participating Employees
promptly following the Exercise Date, which statements will set forth the
amounts of Contributions, the per share purchase price, the number of shares
purchased and the remaining cash balance, if any.

        18. Adjustments Upon Changes in Capitalization.

                (a) Adjustment. Subject to any required action by the
shareholders of the Company, the number of shares of Common Stock covered by
each option under the Plan which has not yet been exercised and the number of
shares of Common Stock which have been authorized for issuance under the Plan
but have not yet been placed under option (collectively, the "Reserves"), as
well as the price per share of Common Stock covered by each option under the
Plan which has not yet been exercised, 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 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 issue 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 Offering Period will terminate
immediately prior to the consummation of such proposed action, unless otherwise
provided by the Board. 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, each option under the Plan shall be assumed or an
equivalent option shall be substituted by such successor corporation or a parent
or subsidiary of such successor corporation, unless the Board determines, in the
exercise of its sole discretion and in lieu of such assumption or substitution,
to shorten the Offering Period then in progress by setting a new Exercise Date
(the "New Exercise Date"). If the Board shortens the Offering Period then in
progress in lieu of assumption or substitution in the event of a merger or sale
of assets, the Board shall notify each participant in writing, at least ten (10)
days prior to the New Exercise Date, that the Exercise Date for his or her
option has been changed to the New Exercise Date and that his or her option will
be exercised automatically on the New Exercise Date, unless prior to such date
he or she has withdrawn from the Offering Period as provided in Section 10. For
purposes of this paragraph, an option granted under the Plan shall be deemed to
be assumed if, following the sale of assets or merger, the option confers


                                      -7-
<PAGE>   8

the right to purchase, for each share of option stock subject to the option
immediately prior to the sale of assets or merger, the consideration (whether
stock, cash or other securities or property) received in the sale of assets or
merger by holders of Common Stock for each share of Common Stock held on the
effective date of the transaction (and if such holders were offered a choice of
consideration, the type of consideration chosen by the holders of a majority of
the outstanding shares of Common Stock); provided, however, that if such
consideration received in the sale of assets or merger was not solely common
stock of the successor corporation or its parent (as defined in Section 424(e)
of the Code), the Board may, with the consent of the successor corporation and
the participant, provide for the consideration to be received upon exercise of
the option to be solely common stock of the successor corporation or its parent
equal in fair market value to the per share consideration received by holders of
Common Stock and the sale of assets or merger.

        The Board may, if it so determines in the exercise of its sole
discretion, also make provision for adjusting the Reserves, as well as the price
per share of Common Stock covered by each outstanding option, in the event that
the Company effects one or more reorganizations, recapitalizations, rights
offerings or other increases or reductions of shares of its outstanding Common
Stock, and in the event of the Company being consolidated with or merged into
any other corporation.

        19. Amendment or Termination.

                (a) The Board of Directors of the Company may at any time
terminate or amend the Plan. Except as provided in Section 18, no such
termination may affect options previously granted, nor may an amendment make any
change in any option theretofore granted which adversely affects the rights of
any participant. In addition, to the extent necessary to comply with Rule 16b-3
under the Exchange Act, or under Section 423 of the Code (or any successor rule
or provision or any applicable law or regulation), the Company shall obtain
shareholder approval in such a manner and to such a degree as so required.

                (b) Without shareholder consent and without regard to whether
any participant rights may be considered to have been adversely affected, the
Board (or its committee) shall be entitled to change the Offering Periods, limit
the frequency and/or number of changes in the amount withheld during an Offering
Period, establish the exchange ratio applicable to amounts withheld in a
currency other than U.S. dollars, permit payroll withholding in excess of the
amount designated by a participant in order to adjust for delays or mistakes in
the Company's processing of properly completed withholding elections, establish
reasonable waiting and adjustment periods and/or accounting and crediting
procedures to ensure that amounts applied toward the purchase of Common Stock
for each participant properly correspond with amounts withheld from the
participant's Compensation, and establish such other limitations or procedures
as the Board (or its committee) determines in its sole discretion advisable
which are consistent with the Plan.

        20. Shareholder Approval. Continuance of the Plan shall be subject to
approval by the shareholders of the Company within twelve (12) months before or
after the Plan is adopted. Such shareholder approval shall be obtained in the
manner and to the degree required under applicable federal and state law.

        21. Notices. All notices or other communications by a participant to the
Company under or in connection with the Plan shall be deemed to have been duly
given when received in the form specified by the Company at the location, or by
the person, designated by the Company for the receipt thereof.

        22. Conditions Upon Issuance of Shares. Shares shall not be issued with
respect to an option unless the exercise of such option and the issuance and
delivery of such shares pursuant thereto shall comply with all


                                      -8-
<PAGE>   9

applicable provisions of law, domestic or foreign, 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 person exercising such
option must represent and warrant at the time of such exercise such person will
not sell, make any short sale of, loan, grant any option for the purchase of, or
otherwise dispose of the shares for a period of one month following the exercise
of such option.

        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 applicable provisions of law.

        23. Term of Plan; Effective Date. 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. It shall continue in effect for a term of
twenty (20) years unless sooner terminated under Section 19.

        24. Additional Restrictions of Rule 16b-3. The terms and conditions of
options granted hereunder to, and the purchase of shares by, persons subject to
Section 16 of the Exchange Act shall comply with the applicable provisions of
Rule 16b-3. This Plan shall be deemed to contain, and such options shall
contain, and the shares issued upon exercise thereof


                                      -9-
<PAGE>   10

shall be subject to, such additional conditions and restrictions as may be
required by Rule 16b-3 to qualify for the maximum exemption from Section 16 of
the Exchange Act with respect to Plan transactions.


<PAGE>   11


                                     ISOCOR

                        1996 EMPLOYEE STOCK PURCHASE PLAN
                             SUBSCRIPTION AGREEMENT

                                                             New Election ______
                                                       Change of Election ______

        1. I, ________________________, hereby elect to participate in the
ISOCOR 1996 Employee Stock Purchase Plan (the "Plan") for the Offering Period
______________, ____ to _______________, ____, and subscribe to purchase shares
of the Company's Common Stock in accordance with this Subscription Agreement and
the Plan.

        2. I elect to have Contributions in the amount of ____% of my
Compensation, as those terms are defined in the Plan, applied to this purchase.
I understand that this amount must not be less than 1% and not more than 10% of
my Compensation during the Offering Period. (Please note that no fractional
percentages are permitted).

        3. I hereby authorize payroll deductions from each paycheck during the
Offering Period at the rate stated in Item 2 of this Subscription Agreement. I
understand that all payroll deductions made by me shall be credited to my
account under the Plan and that I may not make any additional payments into such
account. I understand that all payments made by me shall be accumulated for the
purchase of shares of Common Stock at the applicable purchase price determined
in accordance with the Plan. I further understand that, except as otherwise set
forth in the Plan, shares will be purchased for me automatically on the Exercise
Date of the Offering Period unless I otherwise withdraw from the Plan by giving
written notice to the Company for such purpose.

        4. I understand that I may discontinue at any time prior to the Exercise
Date my participation in the Plan as provided in Section 10 of the Plan. I also
understand that I cannot increase the rate of my Contributions during any
Offering Period but that on one occasion only during any Offering Period, I can
decrease the rate of my Contributions by completing and filing a new
Subscription Agreement, with such decrease taking effect as of the beginning of
the calendar quarter following the date of filing of the new Subscription
Agreement. I further understand that I may change the rate of deductions for
future Offering Periods by filing a new Subscription Agreement, and any such
change will be effective as of the beginning of the next Offering Period. In
addition, I acknowledge that, unless I discontinue my participation in the Plan
as provided in Section 10 of the Plan, my election will continue to be effective
for each successive Offering Period.

        5. I have received a copy of the Company's most recent description of
the Plan and a copy of the complete "ISOCOR 1996 Employee Stock Purchase Plan."
I understand that my participation in the Plan is in all respects subject to the
terms of the Plan.

        6. Shares purchased for me under the Plan should be issued in the
name(s) of (name of employee or employee and spouse only):

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

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

        7. In the event of my death, I hereby designate the following as my
beneficiary(ies) to receive all payments and shares due to me under the Plan:


<PAGE>   12

NAME: (Please print)
                                            ------------------------------------
                                            (First)       (Middle)        (Last)


- ------------------------------              ------------------------------------
(Relationship)                              (Address)


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

        8. I agree that I will not sell, make any short sale of, loan, grant any
option for the purchase of, or otherwise dispose of shares purchased for me
under the Plan for a period of one month following my acquisition of shares
under the Plan.

        9. I understand that if I dispose of any shares received by me pursuant
to the Plan within 2 years after the Offering Date (the first day of the
Offering Period during which I purchased such shares) or within 1 year after the
date of the end of the Offering Period, I will be treated for federal income tax
purposes as having received ordinary compensation income at the time of such
disposition in an amount equal to the excess of the fair market value of the
shares at the time such shares were transferred to me over the price which I
paid for the shares, regardless of whether I disposed of the shares at a price
less than their fair market value at transfer. The remainder of the gain or
loss, if any, recognized on such disposition will be treated as capital gain or
loss.

        I hereby agree to notify the Company in writing within 30 days after the
date of any such disposition, and I will make adequate provision for federal,
state or other tax withholding obligations, if any, which arise upon the
disposition of the Common Stock. The Company may, but will not be obligated to,
withhold from my compensation the amount necessary to meet any applicable
withholding obligation including any withholding necessary to make available to
the Company any tax deductions or benefits attributable to the sale or early
disposition of Common Stock by me.

        10. If I dispose of such shares at any time after expiration of the
2-year and 1-year holding periods, I understand that I will be treated for
federal income tax purposes as having received compensation income only to the
extent of an amount equal to the lesser of (1) the excess of the fair market
value of the shares at the time of such disposition over the purchase price
which I paid for the shares under the option, or (2) 15% of the fair market
value of the shares on the Offering Date. The remainder of the gain or loss, if
any, recognized on such disposition will be treated as capital long-term gain or
loss.

        I understand that this tax summary is only a summary and is subject to
change. I acknowledge that I have been advised to consult my own tax adviser
before participating in the Plan.

        11. I hereby agree to be bound by the terms of the Plan. The
effectiveness of this Subscription Agreement is dependent upon my eligibility to
participate in the Plan.


SIGNATURE:
          -----------------------------

SOCIAL SECURITY #:
                  ---------------------

DATE:
     ----------------------------------


                                      -2-
<PAGE>   13

SPOUSE'S SIGNATURE (necessary
if beneficiary is not spouse):



- ---------------------------------------
(Signature)


- ---------------------------------------
(Print name)


                                      -3-
<PAGE>   14

                                     ISOCOR

                        1996 EMPLOYEE STOCK PURCHASE PLAN

                              NOTICE OF WITHDRAWAL

        I, __________________________, hereby elect to withdraw my participation
in the ISOCOR 1996 Employee Stock Purchase Plan (the "Plan") for the Offering
Period _________. This withdrawal covers all Contributions credited to my
account and is effective on the date designated below.

        I understand that all Contributions credited to my account will be paid
to me within ten (10) business days of receipt by the Company of this Notice of
Withdrawal and that my option for the current period will automatically
terminate, and that no further Contributions for the purchase of shares can be
made by me during the Offering Period.

        I further understand and agree that I will be eligible to participate in
succeeding offering periods only by delivering to the Company a new Subscription
Agreement.


Dated:
      -----------------------------         ------------------------------------
                                            Signature of Employee


                                            ------------------------------------
                                            Social Security Number

<PAGE>   1
                                                                     EXHIBIT 4.2



                                     ISOCOR

                             1999 STOCK OPTION PLAN


         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 the Employees and Consultants
of the Company and to promote the success of the Company's business.

            Options granted hereunder may be either Incentive Stock Options (as
defined under Section 422 of the Code) or Nonstatutory Stock Options, at the
discretion of the Board and as reflected in the terms of the written option
agreement.

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

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

            (b) "Affiliate" shall mean an entity other than a Subsidiary (as
defined below) in which the Company owns an equity interest.

            (c) "Applicable Laws" shall mean the legal requirements relating to
the administration of stock option and restricted stock purchase plans under
applicable U.S. state corporate laws, U.S. federal and applicable state
securities laws, the Code, any Stock Exchange rules or regulations and the
applicable laws of any other country or jurisdiction where Options are granted
under the Plan, as such laws, rules, regulations and requirements shall be in
place from time to time.

            (d) "Board" shall mean the Board of Directors of the Company.

            (e) "Code" shall mean the Internal Revenue Code of 1986, as amended.

            (f) "Committee" shall mean the Committee appointed by the Board of
Directors in accordance with Section 4(a) of the Plan, if one is appointed.

            (g) "Common Stock" shall mean the Common Stock of the Company.

            (h) "Company" shall mean Isocor, a California corporation.

            (i) "Consultant" means any person, including an advisor, who is
engaged by the Company or any Parent or Subsidiary to render services and is
compensated for such services, and any director of the Company whether
compensated for such services or not.

            (j) "Continuous Status as an Employee or Consultant" shall mean the
absence of any interruption or termination of service as an Employee or
Consultant. Continuous Status as an Employee or Consultant shall not be
considered interrupted in the case of sick leave, military leave, or any other
leave of absence approved by the Administrator; provided that such leave is for
a period of not more than 90 days or reemployment upon the expiration of such
leave is guaranteed by contract or statute. For purposes of this Plan, a change
in status from an Employee to a Consultant or from a Consultant to an Employee
will not constitute a termination of employment.

            (k) "Director" shall mean a member of the Board.


<PAGE>   2

            (l) "Employee" shall mean any person (including any Named Executive,
Officer or Director) employed by the Company or any Parent, Subsidiary or
Affiliate of the Company. The payment by the Company of a director's fee to a
Director shall not be sufficient to constitute "employment" of such Director by
the Company.

            (m) "Exchange Act" shall mean the Securities Exchange Act of 1934,
as amended.

            (n) "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 on the date of determination (or if no trading or bids occurred
on the date of determination, on the last trading day prior to the date of
determination), as such price is 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 bid and asked prices for the Common Stock for the last market
trading day prior to the date of determination (or if no bids occurred on the
date of determination, on the last trading day prior to the date of
determination), as such prices are reported in the Wall Street Journal or such
other sources 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.

            (o) "Incentive Stock Option" shall mean an Option intended to
qualify as an incentive stock option within the meaning of Section 422 of the
Code, as designated in the applicable written option agreement.

            (p) "Named Executive" shall mean 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.

            (q) "Nonstatutory Stock Option" shall mean an Option not intended to
qualify as an Incentive Stock Option, as designated in the applicable written
option agreement.

            (r) "Officer" shall mean a person who is an officer of the Company
within the meaning of Section 16 of the Exchange Act and the rules and
regulations promulgated thereunder.

            (s) "Option" shall mean a stock option granted pursuant to the Plan.

            (t) "Optioned Stock" shall mean the Common Stock subject to an
Option.

            (u) "Optionee" shall mean an Employee or Consultant who receives an
Option.



                                      -2-
<PAGE>   3

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

            (w) "Plan" shall mean this 1999 Stock Option Plan.

            (x) "Rule 16b-3" shall mean Rule 16b-3 promulgated under the
Exchange Act as the same may be amended from time to time, or any successor
provision.

            (y) "Share" shall mean a share of the Common Stock, as adjusted in
accordance with Section 14 of the Plan.

            (z) "Subsidiary" shall mean 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 14
of the Plan, the maximum aggregate number of shares that may be sold under the
Plan is 350,000 shares of Common Stock, plus an automatic annual increase on the
first day of each fiscal year over the ten (10) year term of the Plan starting
in 2000 equal to 300,000 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. Notwithstanding any other provision of the Plan,
shares issued under the Plan and later repurchased by the Company shall not
become available for future grant under the Plan.

         4. ADMINISTRATION OF THE PLAN.

            (a) COMPOSITION OF ADMINISTRATOR.

                (i) MULTIPLE ADMINISTRATIVE BODIES. If permitted by the
Applicable Laws, grants under the Plan may (but need not) be made 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, grants under the Plan shall be made by (A) the
Board, if the Board may make grants under the Plan in compliance with Rule 16b-3
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 make grants under the Plan, which Committee shall be
constituted in such a manner as to permit grants under the Plan to comply with
Rule 16b-3, 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.

                (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.



                                      -3-
<PAGE>   4

                (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 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(n) of the Plan;

                (ii) to select the Employees and Consultants 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, or any vesting
acceleration or waiver of forfeiture restrictions regarding any Option and/or
the shares of Common Stock relating thereto, based in each case on such factors
as the Administrator shall determine, in its sole discretion);

                (vii) to determine whether and under what circumstances an
Option may be settled in cash under Section 10(g) 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.

            (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.



                                      -4-
<PAGE>   5

         5. ELIGIBILITY.

            (a) RECIPIENTS OF GRANTS. Nonstatutory Stock Options may be granted
to Employees and Consultants. Incentive Stock Options may be granted only to
Employees, provided, however, that Employees of an Affiliate shall not be
eligible to receive Incentive Stock Options. 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) TYPE OF OPTION. 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 Shares with respect to which Incentive Stock
Options are exercisable for the first time by an 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.
For purposes of this 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.

            (c) NO EMPLOYMENT RIGHTS. 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 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.

         6. TERM OF PLAN. The Plan shall become effective upon its adoption by
the Board. It shall continue in effect for a term of ten (10) years unless
sooner terminated under Section 16 of the Plan.

         7. TERM OF OPTION. The term of each Option shall be the term stated in
the Option Agreement; provided, however, that in the case of an Incentive Stock
Option, 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 Incentive Stock Option granted to an Optionee who, at
the time the Incentive Stock 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 Incentive Stock 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 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.

         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 Administrator, 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; or

                    (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



                                      -5-
<PAGE>   6

                    (A) granted to a person who, at the time of the 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; or

                    (B) granted to any person other than a Named Executive, 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 either have been owned by the
Optionee for more than six months on the date of surrender or were not acquired,
directly or indirectly, from the Company, and (y) 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, (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
irrevocable instructions to a broker to deliver promptly to the Company the
amount of sale or loan proceeds required to pay the exercise price, (7) any
combination of the foregoing methods of payment, or (8) 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 Administrator 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 Administrator, 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 full payment for the
Shares with respect to which the Option is exercised has been received by the
Company. Full payment may, as authorized by the Administrator, 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 STATUS AS AN EMPLOYEE OR CONSULTANT. In the
event of termination of an Optionee's Continuous Status as an Employee or
Consultant, such Optionee may, but only within three (3) months (or such other
period of time, not exceeding three (3) months in the case of an Incentive Stock
Option, as is determined by the Administrator, with such determination in the
case of an Incentive Stock Option being made at the time of grant of the Option)
after the date of such termination (but in no event later than the date of
expiration of



                                      -6-
<PAGE>   7

the term of such Option as set forth in the Option Agreement), exercise his or
her Option to the extent that he or she was entitled to exercise it at the date
of such termination. To the extent that the Optionee was not entitled to
exercise the Option at the date of such termination, or if the optionee does not
exercise such Option (which he or she was entitled to exercise) within the time
specified herein, the Option shall terminate.

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

             (d) DEATH OF OPTIONEE. In the event of the death of an Optionee
during the term of the Option who is at the time of his death an Employee or
Consultant of the Company and who shall have been in Continuous Status as an
Employee or Consultant since the date of grant of the Option, the Option may be
exercised, at any time within twelve (12) months, following the date of death
(but in no event later than the date of expiration 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.

             (e) EXTENSION OF EXERCISE PERIOD. The Administrator shall have full
power and authority to extend the period of time for which an Option is to
remain exercisable following termination of an Optionee's Continuous Service
Status from the periods set forth in Sections 10(b), 10(c) and 10(d) above or in
the Option Agreement to such greater time as the Administrator shall deem
appropriate, provided that in no event shall such Option be exercisable later
than the date of expiration of the term of such Option as set forth in the
Option Agreement.

             (f) 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.

             (g) BUY-OUT PROVISIONS. The Administrator may at any time offer to
buy out for a payment in cash or Shares an Option previously granted under the
Plan based on such terms and conditions as the Administrator shall establish and
communicate to the Optionee at the time such offer is made.

         11. TAXES.

             (a) As a condition of the exercise of an Option granted under the
Plan, the Optionee (or in the case of the Optionee's death, the person
exercising the Option) shall make such arrangements as the Administrator may
require for the satisfaction of any applicable federal, state, local or foreign
withholding tax obligations that may arise in connection with the exercise of
the Option and the issuance of Shares. The Company shall not be required to
issue any Shares under the Plan until such obligations are satisfied.

             (b) In the case of an Employee and in the absence of any other
arrangement, the Employee shall be deemed to have directed the Company to
withhold or collect from his or her compensation an amount sufficient to satisfy
such tax obligations from the next payroll payment otherwise payable after the
date of an exercise of the Option.



                                      -7-
<PAGE>   8

             (c) In the case of an Optionee other than an Employee (or in the
case of an Employee where the next payroll payment is not sufficient to satisfy
such tax obligations, with respect to any remaining tax obligations), in the
absence of any other arrangement and to the extent permitted under the
Applicable Laws, the Optionee shall be deemed to have elected 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 determined as of the applicable Tax
Date (as defined below) equal to the amount required to be withheld. For
purposes of this Section 11, 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 under the Applicable Laws (the "Tax Date").

             (d) If permitted by the Administrator, in its discretion, an
Optionee may satisfy his or her tax withholding obligations upon exercise of an
Option by surrendering to the Company Shares that (i) in the case of Shares
previously acquired from the Company, have been owned by the Optionee for more
than six (6) months on the date of surrender, and (ii) have a Fair Market Value
determined as of the applicable Tax Date equal to the amount required to be
withheld.

             (e) Any election or deemed election by an Optionee to have Shares
withheld to satisfy tax withholding obligations under Section 11(c) or (d) above
shall be irrevocable as to the particular Shares as to which the election is
made and shall be subject to the consent or disapproval of the Administrator.
Any election by an Optionee under Section 11(d) above must be made on or prior
to the applicable Tax Date.

             (f) In the event an 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 is exercised but such
Optionee shall be unconditionally obligated to tender back to the Company the
proper number of Shares on the applicable Tax Date.

         12. 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; provided that the
Administrator may in its discretion grant transferable Nonstatutory Stock
Options pursuant to option agreements specifying (i) the manner in which such
Nonstatutory Stock Options are transferable and (ii) that any such transfer
shall be subject to the Applicable Laws. The designation of a beneficiary by an
Optionee will not constitute a transfer. An Option may be exercised, during the
lifetime of the Optionee, only by the Optionee or a transferee permitted by this
Section 12.

         13. ADJUSTMENTS UPON CHANGES IN CAPITALIZATION; CORPORATE TRANSACTIONS.

             (a) ADJUSTMENT. Subject to any required action by the shareholders
of the Company, the number of shares of Common Stock covered by each outstanding
Option, 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
which 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
Administrator, 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 Option will terminate immediately
prior to the consummation of such proposed action, unless



                                      -8-
<PAGE>   9

otherwise provided by the Administrator. The Administrator may, in the exercise
of its sole discretion in such instances, declare that any Option shall
terminate as of a date fixed by the Administrator and give each Optionee the
right to exercise his or her Option as to all or any part of the Optioned Stock,
including Shares as to which the Option would not otherwise be exercisable. 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
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 Administrator shall notify the Optionee at least
fifteen (15) 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 Administrator;
provided however that in the case of any Incentive Stock Option, the grant date
shall be the later of the date on which the Administrator makes the
determination granting such Incentive Stock Option or the date of commencement
of the Optionee's employment relationship with the Company. 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 at any time amend,
alter, suspend, discontinue or terminate the Plan, but no amendment, alteration,
suspension, discontinuance or termination (other than an adjustment made
pursuant to Section 13 above) shall be made that would materially and adversely
affect the rights of any Optionee under any outstanding grant, without his or
her consent. In addition, to the extent necessary and desirable to comply with
the Applicable Laws, the Company shall obtain stockholder approval of any Plan
amendment in such a manner and to such as degree as required.

             (b) EFFECT OF AMENDMENT OR TERMINATION. No amendment or termination
of the Plan shall materially and adversely affect Options already granted,
unless mutually agreed otherwise between the Optionee and the Administrator,
which agreement must be in writing and signed by such 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 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. OPTION AGREEMENT. Options shall be evidenced by written option
agreements in such form as the Board shall approve.

         19. SHAREHOLDER APPROVAL. If required by the Applicable Laws,
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 manner and to the degree
required under the Applicable Laws.



                                      -9-

<PAGE>   1
                                                                     EXHIBIT 4.3



                                     ISOCOR

                             1999 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:

         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:                           1/4 of the original Shares
                                                     subject to this Option
                                                     shall vest one year after
                                                     the Vesting Commencement
                                                     Date and 1/48th of the
                                                     original number of Shares
                                                     subject to this Option
                                                     shall vest each month
                                                     thereafter.

         Termination Period:                         This 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).

         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 1999 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                                          ---------------------------



                                                     (C) 1996 Venture Law Group

<PAGE>   2

                                     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 1999 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 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.


                                                      (C) 1996 Venture Law Group

<PAGE>   3

                (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.

         6. TERMINATION OF RELATIONSHIP. In the event of termination of
Optionee's Continuous Status as an Employee or Consultant, 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 or Consultant 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.




                                      -2-
<PAGE>   4

         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.

         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 20%.

            (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



                                      -3-
<PAGE>   5

(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 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. 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]




                                      -4-
<PAGE>   6

                                    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 1999 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]



                                November 5, 1999


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 November 8, 1999
(the "Registration Statement") in connection with the registration under the
Securities Act of 1933, as amended, of shares of your Common Stock (the
"Shares") reserved for issuance under the 1996 Employee Stock Purchase Plan and
1999 Stock Option Plan (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 Plan.

        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
                                            A Professional Corporation

                                            /s/ Venture Law Group

EJB


© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission