<PAGE>
                                                                  EXHIBIT 4.04


                             INSIGNIA SOLUTIONS plc

               1995 INCENTIVE STOCK OPTION PLAN FOR U.S. EMPLOYEES

                           As Adopted February 9, 1995
                              Amended April 20, 1999



                1. PURPOSE. The purpose of the Plan is to provide incentives
to attract, retain and motivate eligible persons whose present and potential
contributions are important to the success of the Company, its Parent,
Subsidiaries and Affiliates, by offering them an opportunity to participate
in the Company's future performance through awards of share options.
Capitalized terms not defined in the text are defined in Section 20.

                2.       SHARES SUBJECT TO THE PLAN.

                         2.1 NUMBER OF SHARES AVAILABLE. Subject to Sections
2.2 and 14 of the Plan, the total number of Shares issued and reserved and
available for grant and issue pursuant to options under the Plan, the UK
Employee Share Option Scheme 1996 (the "UK PLAN"), the 1988 U.S. Stock Option
Plan (the "PRIOR PLAN") and the Company's Inland Revenue approved share
option scheme (the "INLAND REVENUE PLAN") (the "PLAN", the "UK PLAN", the
"PRIOR PLAN" and the "INLAND REVENUE PLAN", collectively, the "OPTION
PLANS"), shall be five million seventy-two thousand and seventy
one (5,072,071) Shares. As of the Effective Date, options will no longer be
granted pursuant to the Prior Plan. As of the date of expiration of the
Inland Revenue Plan in December 1996, options will no longer be granted
pursuant to the Inland Revenue Plan. Shares shall again be available for
grant and issue in connection with future awards of options under the Plan
and the UK Plan if such Shares cease to be subject to an option granted
pursuant to the Option Plans. To the extent Shares are subject to options
granted pursuant to the UK Plan, the Inland Revenue Plan or the Prior Plan,
such Shares shall be unavailable for issue under this Plan until such options
expire or become unexercisable without having been exercised in full. To the
extent Shares are subject to options granted pursuant to this Plan, such
Shares shall be unavailable for issue under the UK Plan until such options
expire or become unexercisable without having been exercised in full.

                         2.2 ADJUSTMENT OF SHARES. In the event that the
number of Shares in issue is changed by a consolidation or sub-division of
ordinary shares of the Company or any bonus or other capitalization issue of
ordinary shares or any similar change in the capital structure of the Company
without consideration, or by a Corporate Transaction (as defined in Section
14.1) then, unless such change results in the termination of all outstanding
Awards as a result of the Corporate Transaction, (a) the number of Shares
reserved for issue under the Plan and (b) the Exercise Prices of and number
of Shares subject to outstanding Awards shall be proportionately adjusted,
subject to any required action by the Board or the shareholders of the
Company and compliance with applicable securities laws; PROVIDED, HOWEVER,
that fractions of a Share shall not be issued but shall either be paid in
cash at Fair Market Value or shall be rounded
<PAGE>

up to the nearest Share, as determined by the Committee; and PROVIDED,
FURTHER, that the Exercise Price of any Award may not be decreased to below
the U.S. Dollar equivalent of the par value of the Shares calculated by
reference to the Conversion Rate prevailing at the date of exercise of an
Award.

                3. ELIGIBILITY. ISOs (as defined in Section 5 below) may be
granted only to employees (including officers and directors who are also
employees) of the Company or of a Parent or Subsidiary of the Company. NQSOs
(as defined in Section 5 below) may be granted to employees, officers,
directors, consultants, independent contractors and advisors of the Company
or any Parent, Subsidiary or Affiliate of the Company; PROVIDED such
consultants, contractors and advisors render bona fide services not in
connection with the offer and sale of securities in a capital-raising
transaction. A person may be granted more than one Award under the Plan. Each
person is eligible to receive up to an aggregate maximum of five hundred
thousand (500,000) Shares per fiscal year.

                4.       ADMINISTRATION.

                         4.1 COMMITTEE AUTHORITY. The Plan shall be
administered by the Committee. Subject to the general purposes, terms and
conditions of the Plan, the Committee shall have full power to implement and
carry out the Plan. The Committee shall have the authority to:

                (a)      construe and interpret the Plan, any Stock Option
                         Agreement and any other agreement or document executed
                         pursuant to the Plan;

                (b)      prescribe, amend and rescind rules and regulations
                         relating to the Plan;

                (c)      select persons to receive Awards;

                (d)      determine the form and terms of Awards;

                (e)      determine the number of Shares subject to Awards;

                (f)      determine whether Awards will be granted in replacement
                         of, or as alternatives to, other Awards under the Plan
                         or any other incentive or compensation plan of the
                         Company or any Parent, Subsidiary or Affiliate of the
                         Company;

                (g)      grant waivers of Plan or Award conditions;

                (h)      determine the vesting and exercisability of Awards;

                (i)      correct any defect, supply any omission, or reconcile
                         any inconsistency in the Plan, any Award or any Stock
                         Option Agreement;

                (j)      determine the disposition of Awards in the event of a
                         Participant's divorce or dissolution of marriage; and


                                       -2-
<PAGE>

                (k)      make all other determinations necessary or advisable
                         for the administration of the Plan.

                         4.2 COMMITTEE DISCRETION. Any determination made by
the Committee with respect to any Award shall be made in its sole discretion
at the time of grant of the Award or, unless in contravention of any express
term of the Plan or Award, at any later time, and such determination shall be
final and binding on the Company and all persons having an interest in any
Award under the Plan. The Committee may delegate to one or more officers of
the Company the authority to grant an Award under the Plan to Participants
who are not Insiders of the Company.

                         4.3 COMMITTEE REQUIREMENT. If two or more members of
the Board are Outside Directors, the Committee shall be comprised of at least
two members of the Board, all of whom are Outside Directors.

                5. STOCK OPTIONS. The Committee may grant Awards to eligible
persons and shall determine whether such Awards shall be Incentive Stock
Options within the meaning of the Code ("ISOs") or Nonqualified Stock Options
("NQSOs"), the number of Shares subject to the Award, the Exercise Price of
the Award, the period during which the Award may be exercised, and all other
terms and conditions of the Award, subject to the following:

                         5.1 FORM OF OPTION GRANT. Each Award granted under
the Plan shall be evidenced by a Stock Option Agreement which shall expressly
identify the Award as an ISO or NQSO, and be in such form and contain such
provisions (which need not be the same for each Participant) as the Committee
shall from time to time approve, and which shall comply with and be subject
to the terms and conditions of the Plan.

                         5.2 DATE OF GRANT. The date of grant of an Award
shall be the date on which the Committee makes the determination to grant
such Award, unless otherwise specified by the Committee. The Stock Option
Agreement and a copy of the Plan will be delivered to the Participant within
a reasonable time after the granting of the Award.

                         5.3 EXERCISE PERIOD. Awards shall be exercisable
within the times or upon the events determined by the Committee as in the
Stock Option Agreement; PROVIDED, HOWEVER, that no Award shall be exercisable
after the expiration of ten (10) years from the date the Award is granted;
and PROVIDED FURTHER that no ISO granted to a person who directly or by
attribution owns more than ten percent (10%) of the total combined voting
power of all classes of stock or shares of the Company or any Parent or
Subsidiary of the Company ("TEN PERCENT SHAREHOLDER") shall be exercisable
after the expiration of five (5) years from the date the Award is granted.
The Committee also may provide for the exercise of Awards to become
exercisable at one time or from time to time, periodically or otherwise, in
such number or percentage as the Committee determines.

                         5.4 EXERCISE PRICE. The Exercise Price shall be
determined by the Committee when the Award is granted subject to the
following:


                                       -3-
<PAGE>

                (a)      The Exercise Price shall not be less than 100% of the
                         Fair Market Value of the Shares on the date of grant;
                         PROVIDED, that the Exercise Price of any ISO granted to
                         a Ten Percent Shareholder shall not be less than 110%
                         of the Fair Market Value of the Shares on the date of
                         grant. Payment for the Shares subscribed for may be
                         made in accordance with Section 6 of the Plan.

                (b)      The Exercise Price shall be in U.S. Dollars.

                (c)      The Exercise Price shall not be less than the U.S.
                         Dollar equivalent of the par value of the Shares
                         calculated by reference to the Conversion Rate
                         prevailing at the date of exercise of an Award.

                         5.5 METHOD OF EXERCISE. Awards may be exercised only
by delivery to the Company of a written exercise agreement (the "EXERCISE
AGREEMENT") in a form approved by the Committee (which need not be the same
for each Participant), stating the number of Shares being subscribed for, the
restrictions imposed on the Shares, if any, and such representations and
agreements regarding Participant's investment intent and access to
information and other matters, if any, as may be required or desirable by the
Company to comply with applicable securities laws, together with payment in
full of the Exercise Price for the number of Shares being subscribed for.

                         5.6 TERMINATION. Notwithstanding the exercise
periods set forth in the Stock Option Agreement, exercise of an Award shall
always be subject to the following:

                (a)      If the Participant is Terminated for any reason except
                         death or Disability, then Participant may exercise such
                         Participant's Awards only to the extent that such
                         Awards would have been exercisable upon the Termination
                         Date no later than three (3) months after the
                         Termination Date (or such longer time period not
                         exceeding five (5) years as may be determined by the
                         Committee), but in any event, no later than the
                         expiration date of the Awards.

                (b)      If the Participant is terminated because of death or
                         Disability (or the Participant dies within three (3)
                         months of such termination), then Participant's Awards
                         may be exercised only to the extent such Awards would
                         have been exercisable by Participant on the Termination
                         Date and must be exercised by Participant (or
                         Participant's legal representative or authorized
                         assignee) no later than (i) twelve (12) months after
                         the Termination Date in the case of disability or (ii)
                         eighteen (18) months after the Termination Date in the
                         case of death (or such longer time period not exceeding
                         five (5) years as may be determined by the Committee),
                         but in any event no later than the expiration date of
                         the Awards.

                         5.7 LIMITATIONS ON EXERCISE. The Committee may
specify a reasonable minimum number of Shares that may be subscribed for on
any exercise of an Award; PROVIDED that such minimum number will not prevent
Participant from exercising the Award for the full number of Shares for which
it is then exercisable.


                                       -4-
<PAGE>

                         5.8 LIMITATIONS ON ISOs. The aggregate Fair Market
Value (determined as of the date of grant) of Shares with respect to which
ISOs are exercisable for the first time by a Participant during any calendar
year (under the Plan or under any other incentive stock option plan of the
Company or any Affiliate, Parent or Subsidiary of the Company) shall not
exceed $100,000. If the Fair Market Value of Shares on the date of grant with
respect to which ISOs are exercisable for the first time by a Participant
during any calendar year exceeds $100,000, the Awards for the first $100,000
worth of Shares to become exercisable in such calendar year shall be ISOs and
the Awards for the amount in excess of $100,000 that become exercisable in
that calendar year shall be NQSOs. In the event that the Code or the
regulations promulgated thereunder are amended after the Effective Date of
the Plan to provide for a different limit on the Fair Market Value of Shares
permitted to be subject to ISOs, such different limit shall be automatically
incorporated herein and shall apply to any Awards granted after the effective
date of such amendment.

                         5.9 MODIFICATION, EXTENSION OR RENEWAL. The
Committee may modify, extend or renew outstanding Awards and authorize the
grant of new Awards in substitution therefor; PROVIDED that any such action
may not, without the written consent of Participant, impair any of
Participant's rights under any Award previously granted. Any outstanding ISO
that is modified, extended, renewed or otherwise altered shall be treated in
accordance with Section 424(h) of the Code. The Committee may reduce the
Exercise Price of outstanding Awards without the consent of Participants
affected by a written notice to them; PROVIDED, HOWEVER, that the Exercise
Price may not be reduced below the minimum Exercise Price that would be
permitted under Section 5.4 of the Plan for Awards granted on the date the
action is taken to reduce the Exercise Price.

                         5.10 NO DISQUALIFICATION. Notwithstanding any other
provision in the Plan, no term of the Plan relating to ISOs shall be
interpreted, amended or altered, nor shall any discretion or authority
granted under the Plan be exercised, so as to disqualify the Plan under
Section 422 of the Code or, without the consent of the Participant affected,
to disqualify any ISO under Section 422 of the Code.

                6. PAYMENT FOR SHARES. Payment for Shares subscribed for
pursuant to the Plan may be made in cash (by check) or, where expressly
approved for the Participant by the Committee and where permitted by law:

                (a)      by waiver of compensation due or accrued to Participant
                         for services rendered;

                (b)      provided that a public market for the Shares exists:

                         (1)      through a "same day sale" commitment from
                                  Participant and a broker-dealer that is a
                                  member of the National Association of
                                  Securities Dealers (a "NASD DEALER") whereby
                                  the Participant irrevocably elects to exercise
                                  the Award and to sell a portion of the Shares
                                  so subscribed for in order to pay for the
                                  Exercise Price, and whereby the NASD Dealer
                                  irrevocably commits upon receipt of


                                       -5-
<PAGE>

                                  such Shares to forward the Exercise Price
                                  directly to the Company; or

                         (2)      through a "margin" commitment from Participant
                                  and a NASD Dealer whereby Participant
                                  irrevocably elects to exercise the Award and
                                  to pledge the Shares so subscribed for to the
                                  NASD Dealer in a margin account as security
                                  for a loan from the NASD Dealer in the amount
                                  of the Exercise Price, and whereby the NASD
                                  Dealer irrevocably commits upon receipt of
                                  such Shares to forward the Exercise Price
                                  directly to the Company; or

                (c)      by any combination of the foregoing.

                7.       WITHHOLDING TAXES.

                         7.1 WITHHOLDING GENERALLY. Whenever Shares are to be
issued in satisfaction of Awards granted under the Plan, the Company may
require the Participant to remit to the Company an amount sufficient to
satisfy federal, state and local withholding tax requirements prior to the
delivery of any certificate or certificates for such Shares. Whenever, under
the Plan, payments in satisfaction of Awards are to be made in cash, such
payment shall be net of an amount sufficient to satisfy federal, state, and
local withholding tax requirements.

                         7.2 STOCK WITHHOLDING. When, under applicable tax
laws, a Participant incurs tax liability in connection with the exercise of
any Award that is subject to tax withholding and the Participant is obligated
to pay the Company the amount required to be withheld, the Committee may
allow the Participant to satisfy the minimum withholding tax obligation by
electing to have the Company withhold from the Shares to be issued that
number of Shares having a Fair Market Value equal to the minimum amount
required to be withheld, determined on the date that the amount of tax to be
withheld is to be determined (the "TAX DATE"). All elections by a Participant
to have Shares withheld for this purpose shall be made in writing in a form
acceptable to the Committee and shall be subject to the following
restrictions:

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

                (b)      once made, then except as provided below, the election
                         shall be irrevocable as to the particular Shares as to
                         which the election is made;

                (c)      all elections shall be subject to the consent or
                         disapproval of the Committee.

                8.       PRIVILEGES OF STOCK OWNERSHIP.

                         8.1 VOTING AND DIVIDENDS. No Participant shall have
any of the rights of a shareholder with respect to any Shares until the
Shares are issued to the Participant. After Shares are issued to the
Participant, the Participant shall be a shareholder and have all the rights
of a shareholder with respect to such Shares, including the right to vote and
receive all dividends or other distributions made or paid with respect to
such Shares.


                                       -6-
<PAGE>

                         8.2 FINANCIAL STATEMENTS. The Company shall provide
financial statements to each Participant prior to such Participant's
subscription for Shares under the Plan, and to each Participant annually
during the period such Participant has Awards outstanding; PROVIDED, HOWEVER,
the Company shall not be required to provide such financial statements to
Participants whose services in connection with the Company assure them access
to equivalent information.

                9. TRANSFERABILITY. Subject to Section 4.1(j), Awards granted
under the Plan, and any interest therein, shall not: (a) be transferable or
assignable by the Participant, (b) be made subject to execution, attachment
or similar process, otherwise than by will or by the laws of descent and
distribution or as consistent with the specific Plan and Stock Option
Agreement provisions relating thereto or (c) during the lifetime of the
Participant, be exercisable by anyone other than the Participant, and any
elections with respect to an Award, may be made only by the Participant.

                10. CERTIFICATES. All certificates for Shares or other
securities delivered under the Plan shall be subject to such stock transfer
orders, legends and other restrictions as the Committee may deem necessary or
advisable, including restrictions under any applicable federal, state or
foreign securities law, or any rules, regulations and other requirements of
the SEC or any stock exchange or automated quotation system upon which the
Shares may be listed.

                11. SECURITIES LAW AND OTHER REGULATORY COMPLIANCE. An Award
shall not be effective unless such Award is in compliance with all applicable
federal and state securities laws, rules and regulations of any governmental
body, and the requirements of any stock exchange or automated quotation
system upon which the Shares may then be listed, as they are in effect on the
date of grant of the Award and also on the date of exercise or other issue.
Notwithstanding any other provision in the Plan, the Company shall have no
obligation to issue or deliver certificates for Shares under the Plan prior
to (a) obtaining any approvals from governmental agencies that the Company
determines are necessary or advisable, and/or (b) completion of any
registration or other qualification of such shares under any state or federal
law or ruling of any governmental body that the Company determines to be
necessary or advisable. The Company shall be under no obligation to register
the Shares with the SEC or to effect compliance with the registration,
qualification or listing requirements of any state securities laws, stock
exchange or automated quotation system, and the Company shall have no
liability for any inability or failure to do so.

                12.      EMPLOYMENT WITH COMPANY.

                         12.1 NO OBLIGATION TO EMPLOY. Nothing in the Plan or
any Award granted under the Plan shall confer or be deemed to confer on any
Participant any right to continue in the employ of, or to continue any other
relationship with, the Company or any Parent, Subsidiary or Affiliate of the
Company or limit in any way the right of the Company or any Parent,
Subsidiary or Affiliate of the Company to terminate Participant's employment
or other relationship at any time, with or without cause.


                                       -7-
<PAGE>

                         12.2 NO RIGHT TO COMPENSATION. In the event that any
person holding an Award under the Plan ceases to be employed by, or otherwise
has ceased to provide services to, the Company or a Parent, Subsidiary or
Affiliate for whatever reason, he shall have no right to any compensation in
respect of this loss of right to receive Shares under this Plan.

                13. EXCHANGE AND BUYOUT OF AWARDS. The Committee may, at any
time or from time to time, authorize the Company, with the consent of the
respective Participants, to issue new Awards in exchange for the surrender
and cancellation of any or all outstanding Awards. The Committee may at any
time buy from a Participant an Award previously granted with payment in cash,
Shares or other consideration, based on such terms and conditions as the
Committee and the Participant shall agree.

                14.  CORPORATE TRANSACTIONS.


                                       -8-
<PAGE>

                         14.1 ASSUMPTION OR REPLACEMENT OF AWARDS BY
SUCCESSOR. In the event of (a) a sale of the entire share capital of the
Company to another corporation (whether for consideration in cash or in the
form of securities of any kind), (b) a dissolution or liquidation of the
Company, (c) the sale of substantially all of the assets of the Company, or
(d) any other transaction which qualifies as a "corporate transaction" under
Section 424(a) of the Code wherein the shareholders of the Company give up
all of their equity interest in the Company ("CORPORATE TRANSACTION"), any or
all outstanding Awards may be assumed or replaced by the purchasing or
successor corporation, which assumption or replacement shall be binding on
all Participants. In the alternative, the purchasing or successor corporation
may substitute equivalent Awards or provide substantially similar
consideration to Participants as was provided to shareholders (after taking
into account the existing provisions of the Awards). The purchasing or
successor corporation may also issue, in place of outstanding Shares of the
Company held by the Participant, substantially similar shares or other
property subject repurchase restrictions no less favorable to the Participant.

                         14.2 EXPIRATION OF AWARDS. In the event such
purchasing or successor corporation, if any, refuses to assume or substitute
the Awards, as provided above, pursuant to a transaction described in
Subsection 14.1(a) above, such Awards shall expire on such transaction at
such time and on such conditions as the Board shall determine. In the event
such purchasing or successor corporation, if any, refuses to assume or
substitute the Awards as provided above, pursuant to a corporate transaction
described in Subsections 14.1(b), (c) or (d) above, or there is no purchasing
or successor corporation, and if the Company ceases to exist as a separate
corporate entity, then, notwithstanding any contrary terms in the Stock
Option Agreement, the Awards shall expire on a date at least twenty (20) days
after the Board gives written notice to Participants specifying the terms and
conditions of such termination.

                         14.3 OTHER TREATMENT OF AWARDS. Subject to any
greater rights granted to Participants under the foregoing provisions of this
Section 14, in the event of the occurrence of any Corporate Transaction
described in Section 14.1, any outstanding Awards shall be treated as
provided in the applicable agreement or plan of such Corporate Transaction.

                         14.4 ASSUMPTION OF AWARDS BY THE COMPANY. The
Company, from time to time, also may substitute or assume outstanding awards
granted by another company, whether in connection with an acquisition of such
other company or otherwise, by either (a) granting an Award under the Plan in
substitution of such other company's award, or (b) assuming such award as if
it had been granted under the Plan if the terms of such assumed award could
be applied to an Award granted under the Plan. Such substitution or
assumption shall be permissible if the holder of the substituted or assumed
award would have been eligible to be granted an Award under the Plan if the
other company had applied the rules of the Plan to such grant. In the event
the Company assumes an award granted by another company, the terms and
conditions of such award shall remain unchanged (EXCEPT that the exercise
price and the number and nature of Shares issuable upon exercise of any such
option will be adjusted appropriately pursuant to Section 424(a) of the
Code). In the event the Company elects to grant a new Award rather


                                       -9-
<PAGE>

than assuming an existing option, such new Award may be granted with a
similarly adjusted Exercise Price.

                15. ADOPTION AND SHAREHOLDER APPROVAL. The Plan shall become
effective at such date and time as the Registration Statement filed with the
SEC relating to the Company's securities is declared effective (and then only
provided that the initial public offering later closes) (the "EFFECTIVE
DATE"). The Plan shall be approved by the shareholders of the Company
(excluding Shares issued pursuant to this Plan), consistent with applicable
laws, within twelve months before or after the date the Plan is adopted by
the Board. Upon the Effective Date, the Board may grant Awards pursuant to
the Plan; PROVIDED, HOWEVER, that: (a) no Award may be exercised prior to
initial shareholder approval of the Plan and (b) no Award granted pursuant to
an increase in the number of Shares approved by the Board shall be exercised
prior to the time such increase has been approved by the shareholders of the
Company.

                16. TERM OF PLAN. The Plan will terminate ten (10) years from
the date the Plan is adopted by the Board or, if earlier, the date of
shareholder approval.

                17. AMENDMENT OR TERMINATION OF PLAN. The Board may at any
time terminate or amend the Plan in any respect, including without limitation
amendment of any form of Stock Option Agreement or instrument to be executed
pursuant to the Plan; PROVIDED, HOWEVER, that the Board shall not, without
the approval of the shareholders of the Company, amend the Plan in any manner
that requires such shareholder approval pursuant to the Code or the
regulations promulgated thereunder as such provisions apply to ISO plans;
PROVIDED, FURTHER, that no amendment may be made to outstanding Awards
without the consent of the Participant.

                18. NONEXCLUSIVITY OF THE PLAN. Neither the adoption of the
Plan by the Board, the submission of the Plan to the shareholders of the
Company for approval, nor any provision of the Plan shall be construed as
creating any limitations on the power of the Board to adopt such additional
compensation arrangements as it may deem desirable, including, without
limitation, the granting of stock options otherwise than under the Plan, and
such arrangements may be either generally applicable or applicable only in
specific cases.

                19. GOVERNING LAW. The Plan and all agreements, documents and
instruments entered into pursuant to the Plan shall be governed by and
construed in accordance with the internal laws of the State of California,
excluding that body of law pertaining to conflict of laws.

                20. DEFINITIONS. As used in the Plan, the following terms
shall have the following meanings:

                   "AFFILIATE" means any corporation that directly, or
indirectly through one or more intermediaries, controls or is controlled by,
or is under common control with the Company where "control" (including the
terms "controlled by" and "under common control with") means the possession,
direct or indirect, of the power to cause the direction of the management and
policies of the corporation, whether through the ownership of voting
securities, by contract or otherwise.


                                       -10-
<PAGE>

                   "AWARD" means an award of an option to subscribe for
Shares.

                   "BOARD" means the Board of Directors of the Company.

                   "CODE" means the Internal Revenue Code of 1986, as amended.

                   "COMMITTEE" means the committee appointed by the Board to
administer the Plan, or if no committee is appointed, the Board.

                   "COMPANY" means Insignia Solutions plc, a corporation
organized under the laws of England, or any successor corporation.

                   "CONVERSION RATE" means the average currency conversion
rate quoted by the Bank of America in London as the price for Pounds Sterling
purchased with U.S. Dollars.

                   "DISABILITY" means a disability, whether temporary or
permanent, partial or total, within the meaning of Section 22(e)(3) of the
Code, as determined by the Committee.

                   "EXERCISE PRICE" means the price per share at which a
holder of an Award may subscribe for the Shares issuable upon exercise of the
Award.

                   "FAIR MARKET VALUE" means the value of a share of the
Company's Ordinary Shares of 20p each determined as follows:

           (a)      if such Ordinary Shares, or instruments evidencing such
                    Ordinary Shares (e.g., American Depository Shares or
                    American Depository Receipts), are then quoted on the
                    Nasdaq National Market the closing price on the Nasdaq
                    National Market System on the trading day immediately
                    preceding the date on which Fair Market Value is
                    determined, or, if no such reported sale takes place on
                    such date, the closing price on the next preceding
                    trading date on which a reported sale occurred;

           (b)      if such Ordinary Shares, or instruments evidencing such
                    Ordinary Shares (e.g., American Depository Shares or
                    American Depository Receipts), are publicly traded and
                    are then listed on a national securities exchange, the
                    closing price or, if no reported sale takes place on
                    such date, the closing price on the next preceding
                    trading day on which a reported sale occurred;

           (c)      if such Ordinary Shares, or instruments evidencing such
                    Ordinary Shares (e.g., American Depository Shares or
                    American Depository Receipts), are publicly traded but
                    are not quoted on the Nasdaq National Market nor listed
                    or admitted to trading on a national securities
                    exchange, the average of the closing bid and asked
                    prices on such date, as reported by THE WALL STREET
                    JOURNAL, for the over-the-counter market; or

           (d)      if none of the foregoing is applicable, by the Board in
                    good faith.


                                       -11-
<PAGE>

                    "INSIDER" means an officer or director of the Company or
any other person whose transactions in the Company's ordinary shares are
subject to Section 16 of the Securities Exchange Act of 1934, as amended.

                    "OUTSIDE DIRECTOR" means any outside director as defined
in Section 162(m) of the Code and the regulations issued thereunder.

                    "PARENT" means any corporation (other than the Company)
in an unbroken chain of corporations ending with the Company, if at the time
of the granting of an Award under the Plan, each of such corporations other
than the Company owns stock possessing 50% or more of the total combined
voting power of all classes of stock in one of the other corporations in such
chain.

                    "PARTICIPANT" means a person who receives an Award under
the Plan.

                    "PLAN" means this Insignia Solutions plc 1995 Incentive
Stock Option Plan for U.S. Employees, as amended from time-to-time.

                    "SEC" means the Securities and Exchange Commission.

                    "SECURITIES ACT" means the Securities Act of 1933, as
amended.

                    "SHARES" means Ordinary Shares of 20p each in the
Company, reserved for issue under the Option Plans, as adjusted pursuant to
Sections 2 and 14 of the Plan, any instruments evidencing such Ordinary
Shares (e.g., American Depository Shares or American Depository Receipts) and
any successor security.

                    "STOCK OPTION AGREEMENT" means, with respect to each
Award, the signed written agreement between the Company and the Participant
setting forth the terms and conditions of the Award.

                    "SUBSIDIARY" means any corporation (other than the
Company) in an unbroken chain of corporations beginning with the Company if,
at the time of granting of the Award, each of the corporations other than the
last corporation in the unbroken chain owns stock possessing 50% or more of
the total combined voting power of all classes of stock in one of the other
corporations in such chain.

                    "TERMINATION" or "TERMINATED" means, for purposes of the
Plan with respect to a Participant, that the Participant has ceased to
provide services as an employee, director, consultant, independent contractor
or advisor, to the Company or a Parent, Subsidiary or Affiliate of the
Company, except in the case of sick leave, military leave, or any other leave
of absence approved by the Committee; PROVIDED, that such leave is for a
period of not more than ninety (90) days, or reinstatement upon the
expiration of such leave is guaranteed by contract or statute. The Committee
shall have sole discretion to determine whether a Participant has ceased to
provide services and the effective date on which the Participant ceased to
provide services (the "TERMINATION DATE").


                                       -12-