SCHEDULE 14A INFORMATION

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SIEBEL SYSTEMS, INC.
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2207 Bridgepointe Parkway
San Mateo, California 94404

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

TO BE HELD ON JUNE 11, 200323, 2004

Dear Stockholder:

You are cordially invited to attend the Annual Meeting of Stockholders of Siebel Systems, Inc., a Delaware corporation. The meeting will be held on Wednesday, June 11, 200323, 2004 at 11:00 a.m. Pacific Time, viaat the InternetMarriott Hotel at www.siebel.com,1770 South Amphlett Boulevard, San Mateo, California 94402, for the following purposes:

  1. To elect threefour directors to hold office until the 20062007 Annual Meeting of Stockholders.
  2. To approve the authorization of an aggregate of 15 million shares of our Common Stock for issuance under our 2003 Employee Stock Purchase Plan.
  3. To ratify the selection of KPMG LLP as our independent auditors for the year ending December 31, 2003.2004.
  4. To conduct any other business, including, if presented by their proponents,its proponent, the stockholder proposalsproposal appearing on pages 2215 through 2916 of the proxy statement accompanying this notice, as may be properly brought before the meeting.

These items of business are more fully described in the proxy statement accompanying this notice.

The record date for the annual meeting is April 14, 2003.29, 2004. Only stockholders of record at the close of business on that date may vote at the annual meeting or any adjournment thereof.

By Order of the Board of Directors


/s/ Jeffrey T. Amann


Jeffrey T. Amann
Secretary

San Mateo, California
May 12, 200321, 2004

You are cordially invited to attend the annual meeting which will be held as an audio-only webcast.in person. Whether or not you expect to attend the online annualmeeting in person, please complete, date, sign and return the enclosed proxy, or vote over the telephone or the Internet as instructed in these materials, or complete, date, sign and return the enclosed proxy card, as promptly as possible in order to ensure we receive your representation at the annual meeting.vote. A return envelope (which is postage prepaid if mailed in the United States) is enclosed for your convenience. Even if you have voted by proxy, you may still vote if you attend the online annual meeting by faxing a completed proxy form to (650) 477-5205in person prior to the close of voting. Please note, however, that if your shares are held of record by a broker, bank or other nominee and you wish to vote duringat the online annual meeting, you must obtain a proxy issued in your name from that record holder.








2207 Bridgepointe Parkway
San Mateo, CA 94404

PROXY STATEMENT

FOR THE 20032004 ANNUAL MEETING OF STOCKHOLDERS

JUNE 11, 200323, 2004

QUESTIONS AND ANSWERS ABOUT THIS PROXY MATERIAL AND VOTING

Why am I receiving these materials?

We sent you this proxy statement and the enclosed proxy card because the Board of Directors of Siebel Systems is soliciting your proxy to vote at the 20032004 Annual Meeting of Stockholders. You may vote over the telephone or the Internet as further described below, or you may complete, sign and return the enclosed proxy card. You are also invited to attend the annual meeting which will be held as an audio-only webcast, and we request that you vote on the proposals described in this proxy statement. However,person, although you do not need to attend the online annual meeting to vote your shares.

We intend to mail this proxy statement and accompanying proxy card on or about May 12, 200321, 2004 to all stockholders of record entitled to vote at the annual meeting. Unless otherwise indicated, the discussions relating to the procedures for voting stock are applicable to holders of our Common Stock.common stock. Holders of exchangeable shares of Siebel Janna Arrangement, Inc. should refer to the enclosed information sheet for further instructions on the procedures for exercising the votes associated with those exchangeable shares.

Why areCan I receive materials for future annual meetings online?

Yes, and we strongly encourage you holdingto do so. In an effort to ensure that you receive materials quickly and efficiently, help reduce our printing and postage costs and reduce paper mailed to your home, we offer you the annual meeting through the Internet only as opposedconvenience of viewing materials related to holding a physical annual meeting like in past years?

In recent years, updates in the law and the advancement of the Internet and related interactive technologies have allowed us to hold our annual meetings online. HoldingWith your consent, we will stop sending to you future paper copies of these documents. If you are a holder of record, you may elect to receive future communications over the Internet by following the instructions included on your proxy card. If you are a beneficial holder, we have established an open enrollment page on our website where you may register to receive future communications over the Internet. To participate, follow the instructions atwww.icsdelivery.com/siebel/index.html or select the Electronic Enrollment option on the Investor Relations page atwww.siebel.com/investor.

Your election to view these documents over the Internet will remain in effect until you elect otherwise. If you choose to view future proxy statements and annual reports over the Internet, before the next annual meeting asyou will receive an online webcast rather than as a physical meeting allows stockholders who do not live near our headquartersemail with instructions on how to attend the annual meeting without incurring travel costs. We believe that this enables greater participation at our annual meetings. Moreover, holding an online meeting instead of a physical meeting will enable us to control the costs associated with our annual meetings. Additionally, holding an online meeting will allow stockholders who are unable to attend the meeting to listen to a replay, as noted below.view those materials and vote.

How can I attendWill you be webcasting the annual meeting?

Yes. To access the live webcast of the annual meeting, go to the investor relationsInvestor Relations page on our website, www.siebel.com/investor at least 15 to 20 minutes prior to, and follow the start time to register. Click on the link to the audio-only webcast on that page and a script will take you through the steps necessary to access the webcast.directions provided. Please note that information on, or that can be accessed through, our website, other than our proxy statement, form of proxy and annual report on Form 10-K, is not part of the proxy soliciting materials, is not deemed "filed" with the SEC, and is not to be incorporated by reference into any filing of the Companyour filings under the Securities Act of 1933, as amended, or Securities Exchange Act of 1934, Act.as amended.

Will I be able to listen to a replay of the annual meeting if I can't attend?meeting?

WeYes, we will retain and post an audio-only replay of the meeting and will post itwebcast on our investor relationsInvestor Relations page at www.siebel.com/investor for one week afterfollowing the annual meeting.

Who can vote at the annual meeting?

Only stockholders of record at the close of business on April 14, 200329, 2004 will be entitled to vote at the annual meeting. On the record date, there were 487,999,398502,582,090 shares of Common Stockcommon stock and one share of Series A1 Preferred Stock outstanding and entitled to vote.

How many votes do I have?

Each holder of Common Stockcommon stock will be entitled to one vote for each share held on all matters to be voted upon at the annual meeting. The holder of record of the Series A1 Preferred Stock on such date will be entitled to the number of votes equal to the number of exchangeable shares of Siebel Janna Arrangement, Inc. outstanding on such date (other than exchangeable shares outstanding in the name of Siebel Systems or any of its affiliates). At the close of business on April 14, 2003,29, 2004, there were 1,502,3621,416,170 exchangeable shares outstanding (other than exchangeable shares outstanding in the name of Siebel Systems or any of its affiliates). The holders of record of Common Stockcommon stock and the holders of exchangeable shares (acting through, or pursuant to a proxy granted by, Computershare Trust Company of Canada, (the holder of Series A1 Preferred Stock), acting as trustee) will vote together as a single class on all matters to be voted upon at the annual meeting.

We are entitled to redeem or call the exchangeable shares on or after November 30, 2005.  In addition, we may redeem or call the exchangeable shares upon the occurrence of certain other limited events, including if there are less than 500,000 exchangeable shares outstanding (excluding those held by Siebel Systems or any of its affiliates).  Upon redemption or call, the exchangeable shares will be converted into shares of our common stock at a rate of one share of common stock for each exchangeable share held.  It is our current intention to call the exchangeable shares as soon as we are permitted to do so.

What am I voting on?

There are fivethree matters scheduled for a vote:

In addition, you are entitled to vote on any other matters that are properly brought before the annual meeting.

What are the recommendations of Siebel Systems' Board of Directors?

Our Board of Directors recommendsDirectors:

In combination with the relatively small number of new options issued in 2002 (as noted above) and early 2003, these actions lowered the number of outstanding stock options by an aggregate of 96.2103.3 million shares, from the levels outstanding as ofor 42%, since December 31, 2001, representing2001). Further, as a 39% reduction in the numberresult of option shares outstanding. As a result,these and other actions, stock options outstanding relative to shares outstanding ("Stock Option Overhang") decreased from 53% as follows (in thousands, except percentages):


                                                                            Shares of
                                                                             Common        Stock       Stock
                                                                              Stock       Options      Option
                                                                           Outstanding  Outstanding   Overhang
                                                                           ----------- ------------ ------------
December 31, 20012001........................................................    466,950      247,204           53 %
                                                                           =========== ============ ============
December 31, 2002........................................................    486,428      185,473           38 %
                                                                           =========== ============ ============
December 31, 2003........................................................    498,305      143,903           29 %
                                                                           =========== ============ ============

During 2003, stock options forfeited by employees upon termination exceeded new stock options granted by 4.9 million shares, resulting in a decrease in net Dilution Percentage (as defined below) to 31%stockholders of 1%. For the purposes of the foregoing, "Dilution Percentage" is calculated as of March 31, 2003.

The following table sets forth certain information regardingnew stock options granted during the year, net of stock options forfeited by employees terminating employment, divided by the total outstanding shares of common stock at the beginning of the year. As described above, the Dilution Percentage for 2003 only reflects forfeitures by employees upon termination and, accordingly, does not reflect the voluntary cancellation of stock options of our CEO discussed above.

Only 4.6% of the total options granted to employees in 2003 were granted to the Named Executive Officers, during 2002:as set forth in the table below:


                                                                              Potential Realizable Value
                         Number of     Percent of                             at Assumed Annual Rates of
                         Securities   Total Options                            Stock Price Appreciation     forAggregate
                         Underlying    Granted to    Exercise or                for the Option Term (4)   Black-Scholes
                          Options      Employees     Base Price   Expiration  ------------------------------------------------------  Value on Date
     Officer Name       Granted (1)    in 20022003 (2)  ($/Share)(3)    Date           5%            10%       of Grant (5)
- --------------------------  -------------   -------------- --------------------------------------  ------------  ------------- ------------ -----------  ------------  ------------  -------------
Thomas M. Siebel                 --           -- %  $        --          --   $        --   $        --   Paul Wahl                             --              -- %  $           --             --    $         --    $       --
R. David Schmaier           --              --300,000         1.32 %  $      --             --8.66  04/30/2009   $   --883,568   $ --2,004,515   $  942,000
Kenneth A. Goldman          --              --250,000         1.10 %  $      --             --8.66  04/30/2009   $   --736,307   $ --
Richard P. Chiarello             200,000            3.401,670,430   $  785,000
Edward Y. Abbo              250,000         1.10 %  $      6.20     10/20/20128.66  04/30/2009   $   779,829736,307   $ 1,976,241
William R. McDermott                  --              --1,670,430   $  785,000
Steven M. Mankoff           250,000         1.10 %  $      --             --8.66  04/30/2009   $   --736,307   $ --1,670,430   $  785,000

_________________

  1. Options vest 20% on May 1, 2004, and at a rate of 5% for each quarter after October 21, 2003,of service thereafter, and have a term of tensix years.

  2. Based on an aggregate of 5.922.8 million shares subject to options granted to employees pursuant to our 1996 and 1998 Plans during the year ended December 31, 2002,2003, including grants to the Named Executive Officers.

  3. Under all stock option plans, the stock option exercise price is equal to the fair market value aton the date of grant.

  4. The potential realizable value is calculated based on the term of the option at the time of grant (ten years).grant. Stock price appreciation of 5% and 10% is assumed pursuant to rules promulgated by the SEC and does not represent our prediction of itsour stock price performance.performance or the actual value of the stock options.

  5. Represents the aggregate fair value of the stock options on the date of grant ($3.14 per share), as calculated using the Black-Scholes option valuation model. The fair value does not represent our prediction of our stock price performance, and historically has had no relationship whatsoever to the value that is actually realized.

The following summarizes the distribution and dilutive impact of the stock options held by our Named Executive Officers as of December 31, 2000, 2001, 2002 and 2002:2003:


                                                                                    Year Ended December 31,
                                                                           ---------------------------------
                                                                                      2000-------------------------------------
                                                                              2001        2002         ----------2003
                                                                           ----------- ---------------------- ------------
Stock options held by Named Executive Officers as a percentage of:                                               
  Total options outstanding.......................................................      28.4 %outstanding..............................................       23.8 %       29.3 %       ==========18.7 %
                                                                           =========== ====================== ============
  Outstanding shares of common stock..............................................      11.3 %stock.....................................       12.6 %       11.2 %        ==========5.4 %
                                                                           =========== ====================== ============

As discussed above, we cancelled approximately 26 million stock options held by our CEO in January 2003. Accordingly, the stock options held by our Named Executive Officers as a percentage of both outstanding stock options and shares of Common Stock is expected to decrease in 2003. Specifically, this cancellation reduced the stock options held by Named Executive Officers as a percentage of stock options and shares of Common Stock outstanding to 17.8% and 5.8%, respectively, as of December 31, 2002 (assuming the cancellation had occurred in 2002).

Aggregated Stock Option Exercises for the Year Ended December 31, 2002,2003, and Stock Option Values as of December 31, 20022003

The following table sets forth for each of the Named Executive Officers the shares acquired and the value realized on each exercise of stock options during the year ended December 31, 2002,2003 and the number and value of securities underlying unexercised options held by the Named Executive Officers as of December 31, 2002:2003:


                                                            Number of
                                                      Securities Underlying         Value of Unexercised
                                                      Unexercised Options at       In-the-Money Options at
                           Shares                      December 31, 20022003 (2)        December 31, 20022003 (3)
                        Acquired on      Value       -----------------------------  -----------------------------------------------------  ----------------------------
     Officer Name         Exercise    Realized (1)   Exercisable  Unexercisable   Exercisable   Unexercisable
- --------------------------  ------------- ---------------  ------------------------------------  ------------  -----------    ------------ -------------  -------------  -------------
Thomas M. Siebel                 (4)           1,000,000--   $       34,586,250       32,436,142     12,199,992   $91,834,069--      18,486,135       199,999   $205,259,888   $  8,757,464
Paul Wahl                        500,0002,202,739
R. David Schmaier           257,143   $2,820,659       1,582,860     1,340,000   $  13,568,063        1,552,000      2,450,0006,399,567   $  3,414,841
Kenneth A. Goldman               --   $       --       1,420,000     1,450,000   $         --   $  --
R. David Schmaier                455,824   $  10,758,740        1,018,576      1,861,427   $ 1,267,256   $ 2,458,956
Kenneth A. Goldman                50,000   $     760,900          840,000      1,780,000   $1,315,000
Edward Y. Abbo                   --   $       --         Richard P. Chiarello516,200       440,000   $  3,845,518   $  1,675,550
Steven M. Mankoff                --   $       --         --        200,000826,800       590,000   $  --4,803,794   $  240,000
William R. McDermott              15,000   $     249,450               --             --   $        --   $        --1,315,000

_________________

  1. Based on the fair market value of our Common Stockcommon stock on the exercise date, minus the exercise price, multiplied by the number of shares exercised.

  2. Represents the total number of shares of our Common Stockcommon stock subject to stock options held by the Named Executive Officers as of December 31, 2002.

  3. Based on the fair market value of our Common Stock as of December 31, 2002 ($7.40 per share), minus the exercise price, multiplied by the number of shares underlying the options.

  4. As discussed above, we cancelled approximately 26 million stock options held by Mr. Siebel in January 2003 and as a result, Mr. Siebel has a total of 18.7 million stock options that remain outstanding. Of the approximately 26 million stock options cancelled, 15.1 million were exercisable and 10.9 million were unexercisable. The "in-the-money" value of the stock options cancelled was $14.9 million as of December 31, 2002.

Aggregated Stock Option Exercises for the Quarter Ended March 31, 2003, and Stock Option Values as of March 31, 2003

As discussed above, we took several steps during 2002 and early 2003 to dramatically reduce the number of stock options outstanding. In order to illustrate the impact of these changes on our executive stock option ownership, we have provided the following table, which sets forth the shares acquired and the value realized by the Named Executive Officers on each exercise of stock options during the three months ended March 31, 2003, and the number and value of securities underlying unexercised options held by the Named Executive Officers as of March 31, 2003:


                                                                   Number of
                                                              Securities Underlying           Value of Unexercised
                                                             Unexercised Options at         In-the-Money Options at
                               Shares                          March 31, 2003 (2)               March 31, 2003 (3)
                             Acquired on        Value     ------------------------------   ----------------------------
 Officer Name                 Exercise      Realized (1)   Exercisable     Unexercisable   Exercisable   Unexercisable
- --------------------------  ------------- --------------- --------------   -------------  -------------  -------------
Thomas M. Siebel                      --   $          --     17,886,140         799,994    $92,944,605    $ 4,082,969
Paul Wahl (4)                         --   $          --      1,814,500 (4)          --    $        --    $        --
R. David Schmaier                     --   $          --      1,263,933       1,616,070    $ 2,157,123    $ 2,270,591
Kenneth A. Goldman                    --   $          --        922,500       1,697,500    $        --    $        --
Richard P. Chiarello                  --   $          --             --         350,000    $        --    $   362,000

_________________

  1. Based on the fair market value of our Common Stock on the exercise date, minus the exercise price, multiplied by the number of shares exercised.

  2. Represents the total number of shares of our Common Stock subject to stock options held by the Named Executive Officers as of March 31, 2003.

  3. Based on the fair market value of our Common Stockcommon stock as of MarchDecember 31, 2003 ($8.0113.92 per share), minus the exercise price, multiplied by the number of shares underlying the stock options.

  4. Mr. Wahl resigned as President and Chief Operating Officer effective March 31, 2003. As a result, as these 1,814,500 option shares will be either exercised by Mr. Wahl or cancelled pursuant to the terms of our 1996 Equity Incentive Plan on or before June 30, 2003.



EMPLOYMENT, SEVERANCE AND CHANGE OF CONTROL AGREEMENTS

We do not have any employment, severance or change of control agreements with any Named Executive Officer.








REPORT OF THE COMPENSATION COMMITTEE OF THE BOARD OF DIRECTORS ON
EXECUTIVE COMPENSATION

Our Board of Directors has delegated to the Compensation Committee of the Board (the "Committee") the power and authority to review, modify and approve the overall compensation strategy and policies for Siebel Systems. As of the Company. Thelast fiscal year, our Committee is comprisedconsisted of two non-employee directors: Drs. Eric E. Schmidt and A. Michael Spence.Spence and Mr. Marc F. Racicot. Effective March 1, 2004, Dr. Spence resigned from the Committee, and Mr. Charles R. Schwab was appointed to the Committee. The Committee is currently comprised of three non-employee directors: Dr. Schmidt and Messrs. Schwab and Racicot. The Committee is responsible for, among other things: (i) reviewing and approving corporate performance goals and objectives relevant to the compensation of our executive officers and other senior management, based upon our business needs and consistent with the interests of itsour stockholders; (ii) administering our executive compensation plans, programs and policies; (iii) monitoring corporate performance and its relationship to compensation of executive officers; and (iv) making appropriate recommendations to the Board of Directors concerning matters of executive compensation.

Compensation Philosophy

The policies of the Committee with respect to executive officers, including our CEO, are to provide compensation sufficient to attract, motivate and retain executives of outstanding ability and potential. To emphasize sustained performance of our executive officers, the Committee has adopted policies to align executive compensation with the creation of stockholder value as measured in the equity markets. These policies are implemented using a mix of the following key elements:

In 2002, we retained an independent human resource consulting firm to conduct a global benefits and compensation review.Asreview. As a result of the findings of this study, at the beginning of 2003 we launched a compensation initiative that we believe will continue to attract top talent. Our base salaries on average are at or above industry averages, and total cash compensation on average is targeted at or above the industry averages. Under restructured discretionary bonus and stock option programs, potential awards will beare tied to individual and corporate performance.

In addition, over the past year, we have significantly realigned our business and restructured our equity and other compensation programs to serve the best interests of our stockholders. These actions included:

  • Since March 2003, all of our stock options have been granted with terms of six years. Prior to that time, our stock option grants generally had terms of ten years.

  • Cash Compensation

    Base Salary

    The Committee recognizes the importance of maintaining compensation practices and levels of compensation competitive with other leading high technology companies with which we compete for personnel. Base salary represents the fixed component of the executive compensation program. Our philosophy regarding base salaries is to be at or above the comparable industry median. Base salary levels are established based on an annual review of published executive salary levels at high technology companies with comparable revenues and on the basis of individual performance. The industry group index shown on the Performance Measurement Comparison Graph included in this proxy statement includes many of the larger software companies included in our compensation survey. Periodic increases in base salary are the result of individual contributions evaluated against established annual and long-term performance objectives and an annual salary survey of high technology companies with comparable revenues.

    Cash Bonuses

    Cash bonus awards are designed to reward our executives and other senior managers for assisting us in achieving our operational goals through exemplary individual performance. Bonuses, if any, are linked to both the achievement of specified individual and corporate goals as well as a review of personal performance, which is determined at the discretion of the Committee. Due in part to economic conditions, no bonuses were paid to employees (including executive officers) for the first half of 2002.

    Target bonus levels for the second half of 2002 were established based in part on the Committee's review of published executive total compensation levels at high technology companies with comparable revenues. Corporate performance goals upon which 2002 target bonus levels were based included: the execution of license agreements with a significant number of customers; continuation of high customer and employee satisfaction levels; the introduction of additional products and the improvement of our existing products; the restructuring of our operations; and the achievement of quarterly and annual revenue, profitability and other financial goals.

    In January 2003,2004, the Committee reviewed our 2002Siebel Systems' corporate performance goals. These goals were comprised of five broad objectives: (i) operate a cash-positive, profitable business;business, including the restructuring of our operations; (ii) maintain and improve customer satisfaction levels; (iii) maintain and improve our market leadership; (iv) maintain our product leadership in eBusinessbusiness applications software, including releasing the latest version of our products and the introduction of Siebel CRM OnDemand, our hosted software service; and (v) continue to develop solutions for our customers that lower the total cost of integrating software applications.

    In reviewing our 20022003 performance goals, the Committee noted that our annual results were commendablerevenue levels stabilized in lightmid 2003 and returned to sequential quarterly growth in the second half of 2003 and cost controls resulted in the adverse global economic conditions that existedfurther reduction of expenses in 2002.2003. In particular, the Committee noted that we (i) achieved positive cash flows from operations in 20022003 of $433.2$188.0 million, (ii) increasedredeemed our financial position with cash$300.0 million convertible subordinated debentures for $307.1 million, eliminating substantially all of our long-term debt and short-term investments increasing by $504.9approximately $16.5 million of annual interest expense, (iii) produced earnings prior toachieved our targeted operating margin of 15% during the Restructuring and Option Repurchasefourth quarter of $130.8 million,2003, in advance of expectations, (iv) maintained our customer satisfaction levels, (v) maintained our market share at comparable levels with those achieved in 2002 in the majority of product categories in which we operate, and (vi) continued our technology leadership in the customer relationship management market with the release of Siebel 7.5 and UAN7.5.3 in the second halfthird quarter of 2002.2003 and the introduction of Siebel CRM OnDemand, our hosted software service, in the fourth quarter of 2003.

    Notwithstanding these positive results,In February 2004, the Committee agreedreviewed the 2003 corporate performance goals and determined that reduced executive compensation levels that were initiated by our management as partall of our overall program to reduce costs in 2001 should be maintained. These cost control measures included, among other actions discussed in this proxy statement, the following:

    1. Our CEO's salary and bonus were maintained at a total of $1 for 2002;

    2. The salaries of executives with the title of Senior Vice President and above were maintained at levels whichgoals had been reduced by 20% in April 2001; and

    3. achieved. Based on such achievement, the Committee awarded bonuses to its executive officers at amounts equal to or exceeding targeted bonus levels. Bonuses for our executive management team were notofficers ranged from 85% to 200% of 2003 base compensation paid for the first half of 2002.to such executive officers.

    Equity Compensation

    Our 1996 Equity Incentive Plan, 1998 Equity Incentive Plan and Employee Stock Purchase Plan have been established to provide all of our employees, including executive officers, with an opportunity to share, along with our stockholders, in our long-term performance. The Committee strongly believes that a primary goal of the compensation program should be to provide key employees who have significant responsibility for our management, growth and future success with an opportunity to increase their ownership of Siebel Systems. The interests of stockholders, executives and employees should thereby be closely aligned. Executives are eligible to receive stock options at the discretion of the Committee, giving executives the right to purchase shares of our Common Stockcommon stock in the future at a price equal to fair market value at the date of grant. All grants must be exercised according to the provisions of our 1996 Equity Incentive Plan or 1998 Equity Incentive Plan, as applicable. All outstandingOutstanding options held by executive officers typically vest over a period of four or five years and generally expire six to ten years from the date of grant.

    As total cash compensation for our executive officers is targeted to be competitive with high technology companies with comparable revenue, we have used stock options to incentivize, attract and motivate our executive officers. The goal of the Committee historically has been to provide equity compensation for executive officers, including the CEO,Chief Executive Officer, which equals or exceeds levels at comparable companies. However, we have recently realigned the equityduring 2002 and cash components of our compensation plans and2003, we reduced our option grant guidelines such that equity compensation, in addition to cash compensation is competitive with that provided by high technology companies with comparable revenue. In addition, we have recently revisedmaintained our option grant guidelines for existing employees (including our executive officers) at levels designed to correlate directly with each employee's individual performance. After considering the criteria relating to awarding stock options and general market conditions, the Committee determined that noto grant stock options to all of our executive officer,officers, other than one newly-hired executive officer, would receive option grantsour CEO, in 2002. Options2003 in recognition of their performance and future potential with us. These options granted to the newly-hiredour executive officerofficers vest over a five-year period and expire tensix years from the date of grant. See "Option"Stock Option Grants in the Year Ended December 31, 2002."2003" for a summary of stock options granted to our Named Executive Officers.

    Section 162(m) of the Internal Revenue Code (the "Code") limits us to a deduction for federal income tax purposes of no more than $1 million of compensation paid to certain named executive officers in a taxable year. Compensation above $1 million may be deducted if it is "performance-based compensation" within the meaning of the Code. The Committee intends to satisfy the requirements for "performance-based compensation" with respect to compensation awarded to its named executive officersour Named Executive Officers whenever possible and to the extent then practicable.

    CEOChief Executive Officer Compensation

    The Committee uses the procedures described above in setting the annual salary, bonus and stock option awards for Thomas M. Siebel, our Chairman and CEO.formerCEO. At his request, during 2002,2003, we maintained Mr. Siebel's reduced base salary level of $1. As discussed above, the Committee determined that the 2003 corporate performance goals had been achieved. The Committee concluded that Mr. Siebel was a very significant contributor in accomplishing these objectives and, accordingly, the Committee awarded Mr. Siebel a bonus levels of $1 and $0, respectively. Consistent with our treatment of option grants to other executive officers and at$1.25 million. At Mr. Siebel's request, the Committee did not grant any options to Mr. Siebel in 2002.2003. Additionally, in January 2003, at Mr. Siebel's request, we cancelled approximately 26 million stock option shares held by him for no consideration, as further described above. These stock options represented all options that had been granted to Mr. Siebel during the past four years, including all options granted to him from October 1998 through October 2001 (the date of his last stock option grant). The total fair value (using the Black-Scholes option valuation model) of the approximately 2626.0 million stock option shares cancelled was approximately $56.1 million at the time of cancellation. Based on the number of shares of our Common Stock outstanding as of December 31, 2002, Mr. Siebel's beneficial ownership of Siebel Systems was reduced from approximately 14.0% to approximately 11.2% as a result of the option cancellation.

    Summary

    The Committee believes that the compensation of our executives is appropriate and competitive with the compensation programs provided by other leading software companies with which we compete for executives and employees. The Committee believes its compensation strategy, principles and practices result in a compensation program tied to stockholder returns and linked to the achievement of our annual and longer-term financial and operational results on behalf of our stockholders.

    Stock Options Repurchased

    As discussed previously and in our Annual Report on Form 10-K for the year ended December 31, 2002, we completed a tender offer to repurchase certain stock options with exercise prices greater than $40 per share (the "Option Repurchase"). The Option Repurchase was implemented in order to better: (i) improve employee morale by realigning the cash and equity components of its compensation programs; (ii) eliminate the distraction of significantly out-of-the-money stock options; and (iii) reduce the number of outstanding stock options relative to the number of shares outstanding, or "option overhang," thereby reducing future potential dilution to existing stockholders. Members of our Board of Directors were excluded from the Option Repurchase and, accordingly two individuals, our Chairman and CEO, along with our Vice Chairman, Co-Founder and Vice President, Strategic Planning, did not participate. Other executives were allowed to participate.

    In September 2002, we repurchased 28.1 million stock options tendered under the Option Repurchase for total consideration of $51.9 million, consisting of $31.5 million of fully vested, non-forfeitable shares of our Common Stock (5.5 million shares) and $20.4 million in cash. A total of 4.1 million of these shares are subject to a holding period as further described in our Annual Report on Form 10-K for the year ended December 31, 2002.

    The following table details the stock options tendered by each Named Executive Officer and the consideration paid to such officer during 2002 to repurchase the tendered options:

    
                                                                                       Remaining                     Shares of
                                           Number of    Market Price    Exercise      Contractual                   Common Stock
                                          Securities     of Common      Price of        Life of                     Received in
                                          Underlying     Stock at        Stock       Stock Options      Total        Exchange
                            Repurchase   Stock Options    Time of       Options       Repurchased   Consideration    for Stock
         Officer Name          Date       Repurchased    Repurchase    Repurchased     (in Years)    Received (1)    Options (2)
    - ---------------------- ------------  ------------- ------------   --------------  ------------  -------------   -----------
    Thomas M. Siebel                --             --   $       --     $         --            --    $        --             --
    
    Paul Wahl               09/30/2002        250,000   $     5.75     $      59.81          8.23    $   462,500         52,725
    
    R. David Schmaier               --             --   $       --     $         --            --    $        --             --
    
    Kenneth A. Goldman      09/30/2002      1,500,000   $     5.75     $      72.56          7.74    $ 2,775,000        316,350
    
    Richard P. Chiarello            --             --   $       --     $         --            --    $        --             --
    
    William R. McDermott            --             --   $       --     $         --            --    $        --             --
    

    _________________

    1. Named Executive Officers who participated in the Option Repurchase received, in exchange for the repurchase of the tendered stock options, a fixed amount of consideration equal to the number of shares underlying such tendered stock options, multiplied by $1.85.

    2. In accordance with terms of the Option Repurchase, each participating Named Executive Officer received shares of our Common Stock in payment for the tendered stock options. The number of fully vested, non-forfeitable shares of our Common Stock issued was determined by dividing the total consideration (less the amount of applicable tax withholdings) by the closing price of our Common Stock on September 30, 2002, of $5.75 per share. While the shares of Common Stock issued to the Named Executive Officers are fully vested and non-forfeitable, a portion of the shares of Common Stock are subject to a "holding period" of four years, as determined in accordance with the terms of the Option Repurchase.

    3. The Named Executive Officers are prohibited from selling, transferring, making a short sale, granting any option to purchase or entering into any hedging transaction with the same economic effect as the sale of such shares during the holding period. Accordingly, Mr. Wahl and Mr. Goldman will be required to hold 40,217 and 241,304 shares of our Common Stock, respectively, received in the Option Repurchase until released from the holding period. The shares will be released from the holding period in equal annual installments on October 1, 2003, 2004, 2005 and 2006. The remaining 12,508 and 75,046 shares of our Common Stock issued to Mr. Wahl and Mr. Goldman, respectively, as part of the consideration received in the Option Repurchase were freely tradable at issuance.

    Compensation Committee

    Eric E. Schmidt, Chairman
    A. Michael SpenceMarc F. Racicot
    Charles R. Schwab








    COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

    The members of our Compensation Committee are Drs. Eric E.Dr. Schmidt and A. Michael Spence.Messrs. Schwab and Racicot. No member of this Committee was at any time during the year ended December 31, 2002,2003, or at any other time an officer or employee of Siebel Systems. None of our executive officers has served on the board of directors or compensation committee of any other entity that has or has had one or more executive officers serving as a member of our Board of Directors.

    See "Certain Relationships and Related Transactions" for a description of any transactions between Siebel Systems, members of the Compensation Committee and/or entities affiliated with members of the Compensation Committee.

    UPDATE ON CORPORATE GOVERNANCE AND EXECUTIVE COMPENSATION INITIATIVES

    As part of our ongoing commitment to aligning our corporate governance and executive compensation practices and policies with the stated interests of our stockholders, we intend to institute several new corporate governance and executive compensation initiatives in 2004, including the following:

    Performance-Based Executive Equity Grants

    We intend to base a portion of our 2004 executive equity grants on company performance milestones. Specifically, we intend to structure our 2004 equity grants to Named Executive Officers such that the vesting of 20% of all option shares granted to Named Executive Officers in 2004 will be performance-based, such that they will accelerate upon the achievement of certain performance milestones. While we have not yet determined the parameters of such milestones, our intent is to tie such milestones to important quantitative metrics such as the Company's operating margin or revenue growth in 2004, measured over two or more quarters. If this approach is positive and effective, and does not adversely affect our business, and provided that option accounting or other laws or regulations do not change in a manner that would make this approach impracticable or detrimental in the future, we plan to increase this measure to cover 50% of all option shares we grant to Named Executive Officers in 2005.

    Equity Run Rates

    We believe it is important to issue an amount of employee equity grants that is consistent with our growth objectives and drives stockholder value. We also believe it is important that we give our stockholders a sense of our equity grant plans by publicly communicating our expected annual net dilution from employee equity grants. Accordingly, it is our intention that our target annual net Dilution Percentage be in the range of two to four percent. However, this range could vary, potentially significantly, based on a variety of factors, including but not limited to our merger and acquisition activities, growth rates, executive hires, industry and market conditions, the competitive environment and the regulatory environment.

    Option Repricing

    While we believe that stock options are a critical cornerstone of our ability to recruit and motivate employees, we have a strong bias against repricing existing options. We have not repriced options in the past, and have no current intention to do so in the future. Absent any unforeseen circumstances, even though we reserve the right to reprice options, we do not anticipate that our bias against doing so will change.

    Board Checks and Balances

    In order to further strengthen our existing system of checks and balances, Mr. Siebel recommended to the Board, and the Board agreed, that the roles of Chairman and Chief Executive Officer would be separated effective May 4, 2004, on which date J. Michael Lawrie was appointed as our new Chief Executive Officer. From time to time, we may also consider the adoption of other measures of creating additional diversification of corporate responsibilities.

    Board Self Evaluation

    In addition, in order to facilitate our Board's understanding of its past performance and its identification of opportunities to enhance its future performance, our Board intends to formalize a process that would allow each Board member to evaluate and comment upon the Board's performance. This process is expected to focus on the Board's and the various Board Committees' performance as a whole, rather than the performance of individual Board or Committee members.

    Stockholder Rights Plan

    In 2003 we adopted a stockholder rights plan to protect the economic interests of our stockholders. We plan to give stockholders an even more direct voice in the future regarding this issue. Accordingly, if we decide to renew our stockholder rights plan following its expiration, we intend to first obtain stockholder approval.








    PERFORMANCE MEASUREMENT COMPARISON

    This section is not "soliciting material," is not deemed "filed" with the SEC and is not to be incorporated by reference in any of our filings under the Securities Act of 1933 or the Securities Exchange Act of 1934 whether made before or after the date hereof and irrespective of any general incorporation language in any such filing.

    The following graph shows the total stockholder return of an investment of $100 in cash on December 31, 19971998 for (i) our Common Stock;common stock; (ii) the JP Morgan H&Q Technology Index; (iii) the Nasdaq Computer & Data Processing Index; and (iv)(iii) the S&P 500 Index. All values assume reinvestment of the full amount of all dividends and are calculated as of December 31 of each year:

    
                                                Measurement                            JP MorganCumulative Total Return
                                 ------------------------------------------------------
                                                                     Nasdaq Computer
                Period (Fiscal YearMeasurement           Siebel           H & Q TechnologyS&P 500           and Data
                  Processing   S&P 500
              Covered) (1)Period          Systems, Inc.(1)    Index (2), (3)     Index (2), (3)    Processing Index (2)
             -----------------   ----------------   ----------------  ------------------  ----------------------   -------------------
                12/31/1997       $      100.00     $        100.00   $          100.00    $  100.00
                06/30/1998                 154.26              123.96              146.34       117.71
                12/31/1998              162.33              155.54              178.39       128.58$100.00       $100.00               $100.00
                06/30/1999                  317.19              200.63              223.78       144.50195.40        112.38                125.44
                12/31/1999                  803.59              347.38              392.44       155.64495.03        121.04                219.99
                06/30/2000                  1,564.73              351.98              316.31       154.97963.91        120.53                177.31
                12/31/2000                  1,293.87              224.57              180.62       141.46797.05        110.02                101.25
                06/29/2001                  897.34              175.06              171.56       131.99552.78        102.66                 96.18
                12/31/2001                  535.34              155.23              145.44       124.65329.78         96.95                 81.54
                06/28/2002                  272.07                  --              106.66       108.25167.60         84.19                 59.79
                12/31/2002                   141.58                  --              100.29        97.10
    87.22         75.52                 56.23
                06/28/2003                  111.77         84.40                 63.55
                12/31/2003                  164.07         97.18                 74.08
    

    ________________________

    1. Assumes that $100.00 was invested on December 31, 1997,1998, in our Common Stock,common stock, after giving effect to a 2-for-1 split of our Common Stockcommon stock in March 1998,each of November 1999 and September 2000, and at the closing sales price for our Common Stockcommon stock on that date and that all dividends were reinvested.date. No cash dividends have been declared on our Common Stock.common stock. Stockholder returns over the indicated period should not be considered indicative of future stockholder returns.

    2. Assumes that $100.00 was invested on December 31, 1997,1998, in each index and that all dividends were reinvested. The Nasdaq Computer & Data Processing Index is calculated by the Center for Research in Securities Prices. The S&P 500 Index is calculated by Standard & Poor's, a division of the McGraw-Hill Companies, Inc. The JP Morgan H&Q Technology Index was calculated by Chase H&Q.

    3. The JP Morgan H&Q Technology Index was terminated on March 28, 2001. It has been replaced with the Nasdaq Computer and Data Processing Index. A comparison of the total returns of both the JP Morgan H&Q Technology Index and the Nasdaq Computer and Data Processing Indexes for the applicable period is provided.

    From our initial public offering in June 1996 to December 31, 2002,2003, the price of our Common Stockcommon stock has increased from $1.06 to $7.40$13.92 per share as of December 31, 2003, an increase of approximately 600%1,200%. These results were achieved as a result of the dedication and hard work of our employees, our CEO and our Board of Directors. Past performance of our Common Stock should not be considered indicative of future performance.


    CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

    Mr. Schwab, a member of the Company's Board of Directors, serves as an officer and director for one of the Company's customers. During the year ended December 31, 2002, software license revenues from this customer totaled $1,531,000.

    In June 2002, the Company assigned its lease of an aircraft to First Virtual Air LLC, a company wholly-owned by Thomas M. Siebel, the Company'sour Chairman, and CEO. First Virtual Air took over all obligations of the lease in June 2002, including lease payments of $197,719 per month. However, the Company made lease payments totaling $104,006 relating to a period subsequent to the assignment, for which First Virtual Air reimbursed the Company. First Virtual Air makes thisan aircraft that it leases available to the Companyus for business use. Through a sublease agreement between the Companyus and First Virtual Air, the Company incurswe incur certain costs associated with operating and maintaining the aircraft, and the Company contractswe contract with third parties to perform the services related to this operation and maintenance. To the extent that Mr. Siebel uses the aircraft for personal use, he reimburses the Companyhas agreed to reimburse us for the applicable operating costs.costs incurred by us related to such personal use. During 2002,2003, First Virtual Air reimbursed the Companyus for $293,222$345,000 of the Company'sour operating costs related to Mr. Siebel's personal use of the aircraft. The Company also reimbursed First Virtual Air $107,480 for amounts paid to

    During 2003, we leased two corporate aircraft and owned one aircraft. We operate and maintain these aircraft, contracting with third parties to perform maintenancethe services related to the Company's business use of the aircraft.

    The Company also owns and/or leases corporate aircraftthis operation and operates and maintains these aircraft through third party service providers.maintenance. On a limited basis, certain of the Company'sour officers have used these aircraft for personal use, and the Company reportswe report the standard industry fare level for all personal travel as income for these officers. We have also entered into an arrangement pursuant to which Mr. Siebel may use the aircraft for personal use, provided that he reimburses us for the operating costs, valued at fair market rates as determined by applicable rules, associated with this personal use. During 2002,2003, Mr. Siebel reimbursed the Companyus for $48,225 in connection with$55,000 of our operating costs related to his nominal personal use of such aircraft, which represents the fair market value of such use. The Company is currently considering the sale or lease of one or moretwo of these aircraft.

    Entities affiliated with Mr. Siebel's personal office and philanthropic foundationSiebel lease office space at the Company'sour principal offices, at 2207 Bridgepointe Parkway, San Mateo, California 94404. During 2002,2003, Mr. Siebel reimbursed the Company $74,248us $74,600 for the use of this office space, which is the amount of the Company's fully loaded costs related thereto.

    The Company leases real propertyspace. We leased an apartment owned by Mr. Siebel at 2 Boulevard Suchet, Paris, France for the Company's exclusivecertain business-related use associated with our European Executive-in-Residence program. This program was established in connection1999 and provides for members of our executive management team to relocate to Europe on a rotating basis in order to establish closer relationships with itsour European operations. During 2002, the cost of thatcustomers and partners. The lease rate for 2003 was $169,813, which the Company has determined to be fair market value as confirmed by independent experts. In 2003, the cost of the lease is $1€1 per year. The Company will record the difference between the $1 annual rent andWe have reflected the fair market value of our use of this apartment, estimated at approximately $235,000, as rent expense and addition to equity in the leaseaccompanying consolidated financial statements. In addition, during 2003 we reimbursed Mr. Siebel a total of $107,000 for rent owed by us as an expense to the Company and as additional contributed capital.of December 31, 2002. Mr. Siebel did not use this apartment for any purpose during 2003.

    The Company believesWe believe that the foregoing transactions were on terms no less favorable to it than could be obtained from unaffiliated third parties.

    In response to a lawsuit filed against the Company1996, Siebel Systems and Mr. Siebel were sued by a former employee. The lawsuit contained several causes of action that we believe were frivolous - especially those filed against Mr. Siebel institutedin his individual capacity as Chief Executive Officer. We have a longstanding practice of vigorously defending ourselves and our officers against any and all frivolous claims, and this case was no exception. After receiving a favorable jury verdict in this case, a malicious prosecution lawsuit was filed against the plaintiff's attorneys representingon behalf of Mr. Siebel. On May 6, 2004, the plaintiffCourt of Appeal ruled in the original lawsuit. The Company has agreed to pay Mr. Siebel's litigation feesfavor, overturning a previous summary judgment ruling and expenses in connection with his suit.reinstating the malicious prosecution lawsuit. During 2002, the Company2003, we incurred fees totaling $132,526 underapproximately $143,000 in this agreement.matter. We believe that our principled strategy of seeking any and all means of redress to protect ourselves and our officers from meritless or malicious lawsuits has been highly beneficial to us, since we believe it has had and continues to have a strong deterrent effect on other potential plaintiffs and their attorneys who may be considering frivolous actions against us and our officers.

    The Company hasWe have entered into indemnity agreements with certain employees, officers and directors that provide, among other things, that the Companywe will indemnify such employee, officer or director, under the circumstances and to the extent provided for therein, for expenses, damages, judgments, fines and settlements he or she may be required to pay in actions or proceedings which he or she is or may be made a party by reason of his or her position as an employee, officer, director or other agent of the Company,Siebel Systems, and otherwise to the full extent permitted under Delaware law and itsour Bylaws.

    James C. Gaither, one of the Company's directors, is Senior Counsel to Cooley Godward LLP, which has provided legal services to the Company since its inception.








    HOUSEHOLDING OF PROXY MATERIALS

    The SEC has adopted rules that permit companies and intermediaries (e.g., brokers) to satisfy the delivery requirements for proxy statements and annual reports with respect to two or more stockholders sharing the same address by delivering a single proxy statement addressed to those stockholders. This process, which is commonly referred to as "householding," potentially means extra convenience for stockholders and cost savings for companies.

    This year, a number of brokers with account holders who are our stockholders will be "householding" our proxy materials. A single proxy statement will be delivered to multiple stockholders sharing an address unless contrary instructions have been received from the affected stockholders. Once you have received notice from your broker that they will be "householding" communications to your address, "householding" will continue until you are notified otherwise or until you revoke your consent. If, at any time, you no longer wish to participate in "householding" and would prefer to receive a separate proxy statement and annual report on Form 10-K, please notify your broker, direct your written request to Siebel Systems, Inc., Investor Relations, 2207 Bridgepointe Parkway, San Mateo, California 94404 or investor.relations@siebel.com, or contact Investor Relations at (650) 477-5000. Stockholders who currently receive multiple copies of the proxy statement and/or annual report on Form 10-K at their address and would like to request "householding" of their communications should contact their broker.


    OTHER MATTERS

    The Board of Directors knows of no other matters that will be presented for consideration at the annual meeting. If any other matters are properly brought before the annual meeting, it is the intention of the persons named in the accompanying proxy to vote on such matters in accordance with their best judgment.

    By Order of the Board of Directors


    /s/ Jeffrey T. Amann


    Jeffrey T. Amann
    Secretary

    May 12, 200321, 2004

    A copy of our Annual Reportannual report to the Securities and Exchange Commission on Form 10-K for the year ended December 31, 20022003 is available without charge upon written request to: Corporate Secretary, Siebel Systems, Inc., 2207 Bridgepointe Parkway, San Mateo, California 94404.








    APPENDIX A

    SIEBEL SYSTEMS, INC.
    CHARTER OF THE AUDIT COMMITTEE
    OF THE BOARD OF DIRECTORS

    The Audit Committee of the Board of Directors of Siebel Systems, Inc.
    2003 Employee Stock Purchase Plan

    Adopted (the "Committee") shall consist of a minimum of three directors. Members of the Committee shall be appointed by the Board of Directors on May 2, 2003upon the recommendation of the Nominating and Corporate Governance Committee and may be removed by the Board of Directors in its discretion. All members of the Committee shall be independent directors under the standard adopted by the Nasdaq National Market ("Nasdaq"). All members shall have sufficient financial experience and ability to enable them to discharge their responsibilities and at least one member shall be a financial expert.

    1. Purpose.
      1. The purpose of the Plan isCommittee shall be to provide a means by which Employees of the Company and certain designated Related Corporations may be given an opportunity to purchase shares of the Common Stock of the Company.

      2. The Company, by means of the Plan, seeks to retain the services of such Employees, to secure and retain the services of new Employees and to provide incentives for such persons to exert maximum efforts for the success of the Company and its Related Corporations.

      3. The Company intends that the Purchase Rights be considered options issued under an Employee Stock Purchase Plan.

    2. Definitions.
      1. "Board"meansassist the Board of Directors in its oversight of the Company.

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

      3. "Committee"means a committee appointed by the Board in accordance with Section 3(c)integrity of the Plan.

      4. "Common Stock" means the common stockfinancial statements of the Company.

      5. "Company" means Siebel Systems, Inc., a Delaware corporation.

      6. "Contributions" means the payroll deductions, and other additional payments specifically provided for in the Offering, that a Participant contributes to fund the exercise of a Purchase Right. A Participant may make additional payments into his or her account, if specifically provided for in the Offering, and then only if the Participant has not already had the maximum permitted amount through payroll deductions withheld during the Offering.

      7. "Corporate Transaction" means the occurrence, in a single transaction or in a series of related transactions, of any one or moreCompany, of the following events:

        1. a sale, lease, license or other disposition of all or substantially allCompany's compliance with legal and regulatory requirements, of the consolidated assetsindependence and qualifications of the Company;

        2. a sale or other disposition of at least ninety percent (90%)independent auditor, and of the outstanding securitiesperformance of the Company;Company's internal audit function and independent auditors. The independent auditors shall report directly to the Committee.

        3. In furtherance of this purpose, the Committee shall have the following authority and responsibilities:

        4. a merger, consolidation1. To discuss with management and the independent auditor the annual audited financial statements and quarterly financial statements, including matters required to be reviewed under applicable legal, regulatory or similar transaction following whichNasdaq requirements.

          2. To discuss with management and the Company is notindependent auditor, as appropriate, earnings press releases and financial information and earnings guidance provided to analysts and to rating agencies.

          3. To recommend, for stockholder approval, the surviving corporation; or

        5. a merger, consolidation or similar transaction following whichindependent auditor to examine the Company isCompany's accounts, controls and financial statements. The Committee shall have the surviving corporation butsole authority and responsibility to select, evaluate and if necessary replace the shares of Common Stock outstanding immediately precedingindependent auditor. The Committee shall have the merger, consolidation or similar transaction are converted or exchanged by virtueauthority to monitor the rotation of the merger, consolidationpartners of the independent auditors on the Company's audit engagement team, as required by applicable law. The Committee shall have the sole authority to approve all audit engagement fees and terms and the Committee, or similar transaction into other property, whether in the form of securities, cash or otherwise.

      8. "Director"means a member of the Board.

      9. "Eligible Employee"means an Employee who meetsCommittee, must pre-approve any non-audit service provided to the requirements set forthCompany by the Company's independent auditor.

        4. To discuss with management and the independent auditor, as appropriate, any audit problems or difficulties and management's response, and the Company's risk assessment and risk management policies, including the Company's major financial risk exposure and steps taken by management to monitor and mitigate such exposure. The Committee shall also resolve conflicts or disagreements regarding financial reporting.

        5. To review the Company's financial reporting and accounting standards and principles, significant changes in such standards or principles or in their application and the key accounting decisions affecting the Company's financial statements, including alternatives to, and the rationale for, the decisions made.

        6. To review and approve the internal corporate audit staff functions, including: (i) purpose, authority and organizational reporting lines; (ii) annual audit plan, budget and staffing; and (iii) concurrence in the Offering for eligibilityappointment, compensation and rotation of the head of the internal corporate audit staff.

        7. To review, with the CFO, the head of the internal corporate audit staff, or such others as the Committee deems appropriate, the Company's internal system of audit and financial controls and the results of internal audits.

        8. To obtain and review at least annually a report from the independent auditor delineating: the auditing firm's internal quality-control procedures and any material issues raised within the preceding year by the auditing firm's internal quality-control reviews or by the Public Company Accounting Oversight Board's reviews of the firm. The Committee will also review steps taken by the auditing firm to participateaddress any findings in any of the foregoing reviews. Also, in order to assess auditor independence, the Committee will review at least annually all relationships between the independent auditor and the Company.

        9. To prepare and publish an annual Committee report in the Offering, provided that such Employee also meetsCompany's proxy statement.

        10. To set policies for the requirements for eligibilityhiring of employees or former employees of the Company's independent auditor.

        11. To review and investigate any matters pertaining to participate set forththe integrity of management, including conflicts of interest, related-party transactions or adherence to standards of business conduct as required in the Plan.

      10. "Employee"means any person, including Officers and Directors, who is employed for purposes of Section 423(b)(4) of the Code by the Company or a Related Corporation. Neither service as a Director nor payment of a director's fee shall be sufficient to make an individual an Employeepolicies of the Company or a Related Corporation.

      11. "Employee Stock Purchase Plan"means a plan that grants Purchase Rights intended to be options issued under an "employee stock purchase plan," as that term is defined in Section 423(b)by applicable laws, rules and regulations. This should include regular reviews of the Code.

      12. "Exchange Act"meanscompliance processes. In connection with these reviews, the Securities Exchange ActCommittee will meet, as deemed appropriate, with the general counsel and other Company officers or employees.

        12. To establish procedures for the receipt, retention and treatment of 1934, as amended.

      13. "Fair Market Value"means the value of a security, as determined in good faithcomplaints received by the Board. IfCompany regarding accounting, internal accounting controls or auditing matters, including the security is listed on any established stock exchangeconfidential and anonymous submission by employees of concerns regarding questionable accounting or traded on the Nasdaq National Market or the Nasdaq SmallCap Market, the Fair Market Value of the security, unless otherwise determinedauditing matters as required by the Board,applicable law and as deemed appropriate.

        The Committee shall be the closing sales price (rounded up where necessary to the nearest whole cent) for such security (or the closing bid, if no sales were reported) as quoted on such exchange or market (or the exchange or marketmeet separately at least quarterly with management, with the greatest volume of trading incorporate audit staff and also with the relevant security of the Company) on the determination date (or, if the determination date is not a Trading Date, then the first Trading Date prior to the determination date), as reported inThe Wall Street Journal or such other source as the Board deems reliable.Company's independent auditors.

      14. "Offering"means the grant of Purchase Rights to purchase shares of Common Stock under the Plan to Eligible Employees.

      15. "Offering Date" means a date selected by the Board for an Offering to commence.

      16. "Officer"meansa 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.

      17. "Participant"means an Eligible Employee who holds an outstanding Purchase Right granted pursuant to the Plan.

      18. "Plan"means this Siebel Systems, Inc. 2003 Employee Stock Purchase Plan.

      19. "Purchase Date"means one or more dates during an Offering established by the Board on which Purchase Rights shall be exercised and as of which purchases of shares of Common Stock shall be carried out in accordance with such Offering.

      20. "Purchase Period" means a period of time specified within an Offering beginning on the Offering Date or on the next day following a Purchase Date within an Offering and ending on a Purchase Date. An Offering may consist of one or more Purchase Periods.

      21. "Purchase Right"means an option to purchase shares of Common Stock granted pursuant to the Plan.

      22. "Related Corporation"means any parent corporation or subsidiary corporation, whether now or hereafter existing, as those terms are defined in Sections 424(e) and (f), respectively, of the Code.

      23. "Securities Act"means the Securities Act of 1933, as amended.

      24. "Trading Day"means any day the exchange(s) or market(s) on which shares of Common Stock are listed, whether it be any established stock exchange, the Nasdaq National Market, the Nasdaq SmallCap Market or otherwise, is open for trading.

    3. Administration.
      1. The Board shall administer the Plan unless and until the Board delegates administration to a Committee, as provided in Section 3(c). Whether or not the Board has delegated administration, the Board shall have the final power to determine all questions of policy and expediency that may arise in the administration of the Plan.

      2. The Board (or the Committee) shall have the power, subject to, and within the limitations of, the express provisions of the Plan:

        1. To determine when and how Purchase Rights to purchase shares of Common Stock shall be granted and the provisions of each Offering of such Purchase Rights (which need not be identical).

        2. To designate from time to time which Related Corporations of the Company shall be eligible to participate in the Plan.

        3. To construe and interpret the Plan and Purchase Rights, and to establish, amend and revoke rules and regulations for the administration of the Plan. The Board, in the exercise of this power, may correct any defect, omission or inconsistency in the Plan, in a manner and to the extent it shall deem necessary or expedient to make the Plan fully effective.

        4. To amend the Plan as provided in Section 15.

        5. Generally, to exercise such powers and to perform such acts as it deems necessary or expedient to promote the best interests of the Company and its Related Corporations and to carry out the intent that the Plan be treated as an Employee Stock Purchase Plan.

      3. The Board may delegate administration of the Plan to a Committee of the Board composed of one (1) or more members of the Board. If administration is delegated to a Committee, the Committee shall have in connection with the administration of the Plan, the powers theretofore possessed by the Board, subject, however,authority to retain such resolutions, not inconsistent with the provisions of the Plan,outside counsel, experts and other advisors as may be adopted from time to time by the Board. The Board may abolish the Committee at any time and revest in the Board the administration of the Plan. If administration is delegated to a Committee, references to the Board in this Plan and in the Offering document shall thereafter be deemed to be to the Board or the Committee, as the case may be.

    4. Shares of Common Stock Subject to the Plan.
    5. Subject to the provisions of Section 14 relating to adjustments upon changes in securities, the shares of Common Stock that may be sold pursuant to Purchase Rights shall not exceed in the aggregate fifteen million (15,000,000) shares of Common Stock. If any Purchase Right granted under the Plan shall for any reason terminate without having been exercised, the shares of Common Stock not purchased under such Purchase Right shall again become available for issuance under the Plan.

    6. Grant of Purchase Rights; Offering.
      1. The Board may from time to time grant or provide for the grant of Purchase Rights to purchase shares of Common Stock under the Plan to Eligible Employees in an Offering (consisting of one or more Purchase Periods) on an Offering Date or Offering Dates selected by the Board. Each Offering shall be in such form and shall contain such terms and conditions as the Board shall deem appropriate which shall comply with the requirement of Section 423(b)(5) of the Code that all Employees granted Purchase Rightsin its sole discretion. The Committee shall have the same rightssole authority to approve related fees and privileges. The terms and conditions of an Offering shall be incorporated by reference into the Plan and treated as part of the Plan. The provisions of separate Offerings need not be identical, but each Offering shall include (through incorporation of the provisions of this Plan by reference in the document comprising the Offering or otherwise) the period during which the Offering shall be effective, which period shall not exceed twenty-seven (27) months beginning with the Offering Date, and the substance of the provisions contained in Sections 6 through 9, inclusive.

      2. If a Participant has more than one Purchase Right outstanding under the Plan, unless he or she otherwise indicates in agreements or notices delivered hereunder: (i) each agreement or notice delivered by that Participant shall be deemed to apply to all of his or her Purchase Rights under the Plan, and (ii) a Purchase Right with a lower exercise price (or an earlier-granted Purchase Right, if different Purchase Rights have identical exercise prices) shall be exercised to the fullest possible extent before a Purchase Right with a higher exercise price (or a later-granted Purchase Right if different Purchase Rights have identical exercise prices) shall be exercised.

    7. Eligibility.
      1. Purchase Rights may be granted only to Employees of the Company or, as the Board may designate as provided in Section 3(b), to Employees of a Related Corporation. Except as provided in Section 6(b), an Employee shall not be eligible to be granted Purchase Rights under the Plan unless, on the Offering Date, such Employee has been in the employ of the Company or the Related Corporation, as the case may be, for such continuous period preceding such Offering Date as the Board may require, but in no event shall the required period of continuous employment be greater than two (2) years. In addition, the Board may provide that no Employee shall be eligible to be granted Purchase Rights under the Plan unless, on the Offering Date, such Employee's customary employment with the Company or the Related Corporation is more than twenty (20) hours per week and more than five (5) months per calendar year.

      2. The Board may provide that each person who, during the course of an Offering, first becomes an Eligible Employee shall, on a date or dates specified in the Offering which coincides with the day on which such person becomes an Eligible Employee or which occurs thereafter, receive a Purchase Right under that Offering, which Purchase Right shall thereafter be deemed to be a part of that Offering. Such Purchase Right shall have the same characteristics as any Purchase Rights originally granted under that Offering, as described herein, except that:

        1. the date on which such Purchase Right is granted shall be the "Offering Date" of such Purchase Right for all purposes, including determination of the exercise price of such Purchase Right;

        2. the period of the Offering with respect to such Purchase Right shall begin on its Offering Date and end coincident with the end of such Offering; and

        3. the Board may provide that if such person first becomes an Eligible Employee within a specified period of time before the end of the Offering, he or she shall not receive any Purchase Right under that Offering.

      3. No Employee shall be eligible for the grant of any Purchase Rights under the Plan if, immediately after any such Purchase Rights are granted, such Employee owns 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 Related Corporation. For purposes of this Section 6(c), the rules of Section 424(d) of the Code shall apply in determining the stock ownership of any Employee, and stock which such Employee may purchase under all outstanding Purchase Rights and options shall be treated as stock owned by such Employee.

      4. As specified by Section 423(b)(8) of the Code, an Eligible Employee may be granted Purchase Rights under the Plan only if such Purchase Rights, together with any other rights granted under all Employee Stock Purchase Plans of the Company and any Related Corporations, do not permit such Eligible Employee's rights to purchase stock of the Company or any Related Corporation 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 rights are granted, and which, with respect to the Plan, shall be determined as of their respective Offering Dates) for each calendar year in which such rights are outstanding at any time.

      5. Officers of the Company and any designated Related Corporation, if they are otherwise Eligible Employees, shall be eligible to participate in Offerings under the Plan. Notwithstanding the foregoing, the Board may provide in an Offering that Employees who are highly compensated Employees within the meaning of Section 423(b)(4)(D) of the Code shall not be eligible to participate.

    8. Purchase Rights; Purchase Price.
      1. On each Offering Date, each Eligible Employee, pursuant to an Offering made under the Plan, shall be granted a Purchase Right to purchase up to that number of shares of Common Stock purchasable either with a percentage or with a maximum dollar amount, as designated by the Board, but in either case not exceeding fifteen percent (15%), of such Employee's Earnings (as defined by the Board in each Offering) during the period that begins on the Offering Date (or such later date as the Board determines for a particular Offering) and ends on the date stated in the Offering, which date shall be no later than the end of the Offering.

      2. The Board shall establish one (1) or more Purchase Dates during an Offering as of which Purchase Rights granted pursuant to that Offering shall be exercised and purchases of shares of Common Stock shall be carried out in accordance with such Offering.

      3. In connection with each Offering made under the Plan, the Board may specify a maximum number of shares of Common Stock that may be purchased by any Participant on any Purchase Date during such Offering. In connection with each Offering made under the Plan, the Board may specify a maximum aggregate number of shares of Common Stock that may be purchased by all Participants pursuant to such Offering. In addition, in connection with each Offering that contains more than one Purchase Date, the Board may specify a maximum aggregate number of shares of Common Stock that may be purchased by all Participants on any given Purchase Date under the Offering. If the aggregate purchase of shares of Common Stock issuable upon exercise of Purchase Rights granted under the Offering would exceed any such maximum aggregate number, then, in the absence of any Board action otherwise, a pro rata allocation of the shares of Common Stock available shall be made in as nearly a uniform manner as shall be practicable and equitable.

      4. The purchase price of shares of Common Stock acquired pursuant to Purchase Rights shall be not less than the lesser of:

        1. an amount equal to eighty-five percent (85%) of the Fair Market Value of the shares of Common Stock on the Offering Date; or

        2. an amount equal to eighty-five percent (85%) of the Fair Market Value of the shares of Common Stock on the applicable Purchase Date.

    9. Participation; Withdrawl; Termination.
      1. A Participant may elect to authorize payroll deductions pursuant to an Offering under the Plan by completing and delivering to the Company, within the time specified in the Offering, an enrollment form (in such form as the Company may provide). Each such enrollment form shall authorize an amount of Contributions expressed as a percentage of the submitting Participant's Earnings (as defined in each Offering) during the Offering (not to exceed the maximum percentage specified by the Board). Each Participant's Contributions shall be credited to a bookkeeping account for such Participant under the Plan and shall be deposited with the general funds of the Company except where applicable law requires that Contributions be deposited with a third party. To the extent provided in the Offering, a Participant may begin such Contributions after the beginning of the Offering. To the extent provided in the Offering, a Participant may thereafter reduce (including to zero) or increase his or her Contributions.

      2. During an Offering, a Participant may cease making Contributions and withdraw from the Offering by delivering to the Company a notice of withdrawal in such form as the Company may provide. Such withdrawal may be elected at any time prior to the end of the Offering, except as provided otherwise in the Offering. Upon such withdrawal from the Offering by a Participant, the Company shall distribute to such Participant all of his or her accumulated Contributions (reduced to the extent, if any, such deductions have been used to acquire shares of Common Stock for the Participant) under the Offering, and such Participant's Purchase Right in that Offering shall thereupon terminate. A Participant's withdrawal from an Offering shall have no effect upon such Participant's eligibility to participate in any other Offerings under the Plan, but such Participant shall be required to deliver a new enrollment form in order to participate in subsequent Offerings.

      3. Purchase Rights granted pursuant to any Offering under the Plan shall terminate immediately upon a Participant ceasing to be an Employee for any reason or for no reason (subject to any post-employment participation period required by law) or other lack of eligibility. The Company shall distribute to such terminated or otherwise ineligible Employee all of his or her accumulated Contributions (reduced to the extent, if any, such deductions have been used to acquire shares of Common Stock for the terminated or otherwise ineligible Employee) under the Offering.

      4. Purchase Rights shall not be transferable by a Participant otherwise than by will or the laws of descent and distribution, or by a beneficiary designation as provided in Section 13 and, during a Participant's lifetime, shall be exercisable only by such Participant.

      5. Unless otherwise specified in an Offering, the Company shall have no obligation to pay interest on Contributions.

    10. Exercise.
      1. On each Purchase Date during an Offering, each Participant's accumulated Contributions shall be applied to the purchase of shares of Common Stock up to the maximum number of shares of Common Stock permitted pursuant to the terms of the Plan and the applicable Offering, at the purchase price specified in the Offering. No fractional shares shall be issued upon the exercise of Purchase Rights unless specifically provided for in the Offering.

      2. If any amount of accumulated Contributions remains in a Participant's account after the purchase of shares of Common Stock and such remaining amount is less than the amount required to purchase one share of Common Stock on the final Purchase Date of an Offering, then such remaining amount shall be distributed to such Participant after the final Purchase Date, without interest. If the amount of Contributions remaining in a Participant's account after the purchase of shares of Common Stock is at least equal to the amount required to purchase one (1) whole share of Common Stock on the final Purchase Date of the Offering, then such remaining amount shall be distributed in full to such Participant at the end of the Offering.

      3. No Purchase Rights may be exercised to any extent unless the shares of Common Stock to be issued upon such exercise under the Plan are covered by an effective registration statement pursuant to the Securities Act and the Plan is in material compliance with all applicable federal, state, foreign and other securities and other laws applicable to the Plan. If on a Purchase Date during any Offering hereunder the shares of Common Stock are not so registered or the Plan is not in such compliance, no Purchase Rights or any Offering shall be exercised on such Purchase Date, and the Purchase Date shall be delayed until the shares of Common Stock are subject to such an effective registration statement and the Plan is in such compliance, except that the Purchase Date shall not be delayed more than twelve (12) months and the Purchase Date shall in no event be more than twenty-seven (27) months from the Offering Date. If, on the Purchase Date under any Offering hereunder, as delayed to the maximum extent permissible, the shares of Common Stock are not registered and the Plan is not in such compliance, no Purchase Rights or any Offering shall be exercised and all Contributions accumulated during the Offering (reduced to the extent, if any, such deductions have been used to acquire shares of Common Stock) shall be distributed to the Participants.

    11. Covenants of the Company.
    12. retention terms.

      The Company shall seek to obtain from each federal, state, foreign or other regulatory commission or agency having jurisdiction over the Plan such authority as may be required to issue and sell shares of Common Stock upon exercise of the Purchase Rights. If, after commercially reasonable efforts, the Company is unable to obtain from any such regulatory commission or agency the authority that counselprovide for the Company deems necessary for the lawful issuance and sale of shares of Common Stock under the Plan, the Company shall be relieved from any liability for failure to issue and sell shares of Common Stock upon exercise of such Purchase Rights unless and until such authority is obtained.

    13. Use of Proceeds from Shares of Common Stock.
    14. Proceeds from the sale of shares of Common Stock pursuant to Purchase Rights shall constitute general funds of the Company.

    15. Rights as a Stockholder.
    16. A Participant shall not be deemed to be the holder of, or to have any of the rights of a holder with respect to, shares of Common Stock subject to Purchase Rights unless and until the Participant's shares of Common Stock acquired upon exercise of Purchase Rights are recorded in the books of the Company (or its transfer agent).

    17. Designation of Beneficiary.
      1. A Participant may file a written designation of a beneficiary who is to receive any shares of Common Stock and/or cash, if any, from the Participant's account under the Plan in the event of such Participant's death subsequent to the end of an Offering but prior to delivery to the Participant of such shares of Common Stock or 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 during an Offering.

      2. The Participant may change such designation of beneficiary 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 whose designation is legally effective and valid under the Plan and who is living at the time of such Participant's death, the Company shall deliver such shares of Common Stock and/or cash either as required by local law or 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 sole discretion, may deliver such shares of Common Stock and/or cash to the spouse or to any one or more dependents or 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.

    18. Adjustments Upon Changes in Securities; Corporate Transactions.
      1. If any change is made in the shares of Common Stock, subject to the Plan, or subject to any Purchase Right, without the receipt of consideration by the Company (through merger, consolidation, reorganization, recapitalization, reincorporation, stock dividend, dividend in property other than cash, stock split, liquidating dividend, combination of shares, exchange of shares, change in corporate structure or other transaction not involving the receipt of consideration by the Company), the Plan shall be appropriately adjusted in the type(s), class(es) and maximum number of shares of Common Stock subject to the Plan pursuant to Section 4(a), and the outstanding Purchase Rights shall be appropriately adjusted in the type(s), class(es), number of shares and purchase limits of such outstanding Purchase Rights. The Board shall make such adjustments, and its determination shall be final, binding and conclusive. (The conversion of any convertible securities of the Company shall not be treated as a "transaction not involving the receipt of consideration by the Company.")

      2. In the event of a Corporate Transaction, then: (i) any surviving or acquiring corporation may continue or assume Purchase Rights outstanding under the Plan or may substitute similar rights (including a right to acquire the same consideration paid to stockholders in the Corporate Transaction) for those outstanding under the Plan, or (ii) if any surviving or acquiring corporation does not continue or assume such Purchase Rights or does not substitute similar rights for Purchase Rights outstanding under the Plan, then, the Participants' accumulated Contributions shall be used to purchase shares of Common Stock within five (5) business days prior to the Corporate Transaction under the ongoing Offering, and the Participants' Purchase Rights under the ongoing Offering shall terminate immediately after such purchase.

    19. Amendment of the Plan.
      1. The Board at any time, and from time to time, may amend the Plan. However, except as provided in Section 14 relating to adjustments upon changes in securities, no amendment shall be effective unless approved by the stockholders of the Company to the extent stockholder approval is necessary for the Plan to satisfy the requirements of Section 423 of the Code or other applicable laws or regulations.

      2. It is expressly contemplated that the Board may amend the Plan in any respect the Board deems necessary or advisable to provide Employees with the maximum benefits provided or to be provided under the provisions of the Code and the regulations promulgated thereunder relating to Employee Stock Purchase Plans and/or to bring the Plan and/or Purchase Rights into compliance therewith.

      3. The rights and obligations under any Purchase Rights granted before amendment of the Plan shall not be impaired by any amendment of the Plan except: (i) with the consent of the person to whom such Purchase Rights were granted, or (ii) as necessary to comply with any laws or governmental regulations (including, without limitation, the provisions of the Code and the regulations promulgated thereunder relating to Employee Stock Purchase Plans).

    20. Termination or Suspension of the Plan.
      1. The Board in its discretion may suspend or terminate the Plan at any time. Unless sooner terminated, the Plan shall terminate at the time that all of the shares of Common Stock reserved for issuance under the Plan, as increased and/or adjusted from time to time, have been issued under the terms of the Plan. No Purchase Rights may be granted under the Plan while the Plan is suspended or after it is terminated.

      2. Any benefits, privileges, entitlements and obligations under any Purchase Rights while the Plan is in effect shall not be impaired by suspension or termination of the Plan except (i) as expressly provided in the Plan or with the consent of the person to whom such Purchase Rights were granted, (ii) as necessary to comply with any laws, regulations, or listing requirements, or (iii) as necessary to ensure that the Plan and/or Purchase Rights comply with the requirements of Section 423 of the Code.

    21. Effective Date of Plan.
    22. The Plan shall become effectiveappropriate funding, as determined by the Board, but no Purchase Rights shall be exercised unlessCommittee, for payment of ordinary administrative expenses of the Committee that are necessary or appropriate in carrying out its duties and untilcompensation to (a) the Plan has been approvedCompany's independent auditors for the purpose of rendering or issuing an audit report and (b) to any outside advisors employed by the stockholdersCommittee pursuant to this Charter.

      The Committee shall report its recommendations to the Board of the Company within twelve (12) months before orDirectors after the date the Plan is adopted by the Board.each Committee meeting.

    23. Miscellaneous Provisions.
      1. The Plan and Offering do not constitute an employment contract. Nothing in the Plan or in the Offering shall in any way alter the at will nature of a Participant's employment or be deemed to create in any way whatsoever any obligation on the part of any Participant to continue in the employ of the Company or a Related Corporation, or on the part of the Company or a Related Corporation to continue the employment of a Participant.

      2. The provisions of the Plan shall be governed by the laws of the State of California without resort to that state's conflicts of laws rules.








    SIEBEL SYSTEMS, INC.
    PROXY SOLICITED BY THE BOARD OF DIRECTORS
    FOR THE ANNUAL MEETING OF STOCKHOLDERS
    TO BE HELD ON JUNE 11, 200323, 2004

    The undersigned hereby appoints Thomas M. Siebel, J. Michael Lawrie and Kenneth A. Goldman and each of them, as attorneys-in-fact and proxies of the undersigned, with full power of substitution, to vote all of the shares of stock of Siebel Systems, Inc. that the undersigned may be entitled to vote at the Annual Meeting of Stockholders of Siebel Systems, Inc., to be held as an audio-only webcastat the Marriott Hotel at 1770 South Amphlett Boulevard, San Mateo, California 94402 on Wednesday, June 11, 200323, 2004 at 11:00 a.m. Pacific time (and at any and all postponements, continuations and adjournments thereof), with all powers that the undersigned would possess if present, upon and in respect of the following matters and in accordance with the following instructions, with discretionary authority as to any and all other matters that may properly come before the meeting.

    UNLESS A CONTRARY DIRECTION IS INDICATED, THIS PROXY WILL BE VOTEDFOR
    ALL NOMINEES LISTED IN PROPOSAL 1,FOR PROPOSALSPROPOSAL 2, ANDABSTAIN ON PROPOSAL 3, ANDAGAINST PROPOSALS 4
    AND 5, AS MORE SPECIFICALLY DESCRIBED IN THE PROXY STATEMENT. IF SPECIFIC
    INSTRUCTIONS ARE INDICATED, THIS PROXY WILL BE VOTED IN ACCORDANCE THEREWITH.
    (Continued and to be signed on other side)

    FOLD AND DETACH HERE
    Please mark your vote as indicated in this exampleý

    THE BOARD OF DIRECTORS RECOMMENDS A VOTEFOR PROPOSAL 1.

    PROPOSAL 1: To elect threefour directors to hold office until the 20062007 Annual Meeting of Stockholders.

    ¨ FOR all nominees listed below (except as markedindicated to the contrary below)

    ¨ WITHHOLD AUTHORITY to vote for all nominees listed below.below

    NOMINEES: (01) Patricia A. House,C. Scott Hartz, (02) Eric E. Schmidt, Ph.D.,Charles R. Schwab, (03) A. Michael Spence, Ph.D.George T. Shaheen, (04)John W. White

    TO WITHHOLD AUTHORITY TO VOTE FOR ANY NOMINEE(S), WRITE SUCH NOMINEE'S NAME BELOW:


    THE BOARD OF DIRECTORS RECOMMENDS A VOTEFOR PROPOSAL 2.

    PROPOSAL 2: To approve the authorization of an aggregate of 15 million shares of our Common Stock for issuance under our 2003 Employee Stock Purchase Plan.

    ¨ FOR

    ¨ AGAINST

    ¨ ABSTAIN

    THE BOARD OF DIRECTORS RECOMMENDS A VOTEFOR PROPOSAL 3.

    PROPOSAL 3: To ratify the selection of KPMG LLP as our independent auditors for the year ending December 31, 2003.2004.

    ¨ FOR

    ¨ AGAINST

    ¨ ABSTAIN

    THE BOARD OF DIRECTORS RECOMMENDS A VOTE OFAGAINSTABSTAIN ON PROPOSAL 4.3.

    PROPOSAL 4:3: To vote on the stockholder proposal to adopt and disclose an "equity policy" designatingrequesting that the intended useBoard of equity in management compensation programs and requiring that a portion of stock option grants be performance-based.

    ¨ FOR

    ¨ AGAINST

    ¨ ABSTAIN

    THE BOARD OF DIRECTORS RECOMMENDS A VOTEAGAINST PROPOSAL 5.

    PROPOSAL 5: To vote on the stockholder proposal toDirectors adopt a policy thatof expensing the cost of future employee and director stock options be recognized in our annual income statement.

    ¨ FOR

    ¨ AGAINST

    ¨ ABSTAIN

    ELECTRONIC DELIVERY: Consenting to receive all future annual meeting materials and shareholder communications electronically is simple and fast. Enroll today at¨www.melloninvestor.com/ISD I CONSENT TO FUTURE ELECTRONIC DELIVERY OF PROXY MATERIALS. (Please disregard if you have previously provided for secure online access to your consent.)

    By checking the box above, I consent to future delivery of annual reports, proxy materials, statements, prospectusestax documents and other materials and stockholder communications electronically via the Internet at a webpage which will be disclosed to me. I understand that Siebel Systems, Inc. will no longer be required to distribute to me printed materials relating to any future stockholder meeting until my consent is revoked. I understand that I may revoke my consent at any time by contacting Siebel Systems, Inc.'s transfer agent, Mellon Investor Services LLC, 85 Challenger Road, Ridgefield Park, New Jersey 07660, and that costs associated with electronic delivery, such as Internet usage and telephone charges as well as any costs I may incur in printing documents, will not be reimbursed by the Company.important shareholder correspondence.

    PLEASE VOTE, DATE AND PROMPTLY RETURN THIS PROXY IN THE ENCLOSED RETURN ENVELOPE, WHICH IS POSTAGE PREPAID IF MAILED IN THE UNITED STATES.

    SIGNATURE(S)___________________________________________________ DATED ______________, 2003

    2004
    Please sign exactly as your name appears hereon. If the stock is registered in the names of two or more persons, each person should sign. Executors, administrators, trustees, guardians and attorneys-in-fact should add their titles. If signer is a corporation, please give full corporate name and have a duly authorized officer sign, stating title. If signer is a partnership, please sign in partnership name by a duly authorized person.

    - Detach here from proxy voting card -


    Vote by Internet or Telephone or Mail
    24 Hours a Day, 7 Days a Week

    Internet and telephone voting is available until 11:0059 p.m., Pacific Time on June 10, 2003.22, 2004.

    Your telephone or Internet vote authorizes the named proxies to vote your shares in the same manner as if you marked, signed and returned your proxy card.

    Internet

    http://www.eproxy.com/sebl

    Use the Internet to vote your proxy. Have your proxy card in hand when you access the web site. You will be prompted to enter your control number, located in the box below, to create and submit an electronic ballot.

    OR

    Telephone

    1-800-435-6710

    Use any touch-tone telephone to vote your proxy. Have your proxy card in hand when you call. You will be prompted to enter your control number, located in the box below, and then follow the instructions given.

    OR

    Mail

     

    Mark, sign and date your proxy card and return it in the enclosed postage-paidpostage- paid envelope.

    If you vote your proxy by Internet or telephone,
    you do NOT need to mail back your proxy card.

    You can view the Annual Reportannual report on Form 10-K and proxy statement on the Internet at: http://www.siebel.com.








    VOTING INSTRUCTION CARD
    DIRECTION GIVEN BY REGISTERED HOLDERS OF
    EXCHANGEABLE SHARES OF SIEBEL JANNA ARRANGEMENT, INC.
    FOR THE JUNE 11, 200323, 2004 ANNUAL MEETING OF
    STOCKHOLDERS OF SIEBEL SYSTEMS, INC.

    The undersigned, having read the Notice of Annual Meeting of Stockholders (the "Annual Meeting") of Siebel Systems, Inc., a Delaware corporation, to be held as an audio-only webcastat the Marriott Hotel at 1770 South Amphlett Boulevard, San Mateo, California 94402 on Wednesday, June 11, 2003,23, 2004, at 11:00 a.m., Pacific time, the Proxy Statement dated May 12, 200321, 2004 and the accompanying Notice to Holders of Exchangeable Shares of Siebel Janna Arrangement, Inc., receipt of each is hereby acknowledged, does hereby instruct and direct Computershare Trust Company of Canada (the "Trustee") pursuant to the provisions of the Voting and Exchange Trust Agreement, dated as of November 14, 2000 and First Supplemental Trust Agreement to the Voting and Exchange Trust Agreement, dated October 18, 2002 (together, the "Trust Agreement"), among the Company,Siebel Systems, Inc., Siebel Janna Arrangement, Inc. and the Trustee, as follows:

    (PLEASE NOTE: IF NO DIRECTION IS MADE AND YOU SIGN BELOW, THE TRUSTEE IS HEREBY AUTHORIZED AND DIRECTED TO VOTE FOR ALL NOMINEES LISTED IN PROPOSAL 1, FOR PROPOSALSPROPOSAL 2, AND ABSTAIN ON PROPOSAL 3, AND AGAINST PROPOSALS 4 AND 5, AS MORE SPECIFICALLY DESCRIBED IN THE PROXY STATEMENT AND AS TO ANY OTHER MATTERS THAT MAY PROPERLY COME BEFORE THE ANNUAL MEETING TO VOTE IN ITS DISCRETION.)

    (Please select one of A or B)

    A.¨ Exercise or cause to be exercised, whether by proxy given by the Trustee to a representative of Siebel Systems, Inc. or otherwise, the undersigned's voting rights at the Annual Meeting, or any postponement or adjournment thereof, as follows:

    (Please complete the following only if you have selected Alternative A)

    THE BOARD OF DIRECTORS RECOMMENDS A VOTEFOR PROPOSAL 1.

    PROPOSAL 1: To elect threefour directors to hold office until the 20062007 Annual Meeting of Stockholders.

    ¨ FOR all nominees listed below (except as markedindicated to the contrary below)

    ¨ WITHHOLD AUTHORITY to vote for all nominees listed below.below

    NOMINEES: (01) Patricia A. House,C. Scott Hartz, (02) Eric E. Schmidt, Ph.D.,Charles R. Schwab, (03) A. Michael Spence, Ph.D.George T. Shaheen, (04)John W. White

    TO WITHHOLD AUTHORITY TO VOTE FOR ANY NOMINEE(S), WRITE SUCH NOMINEE'S NAME BELOW:

    THE BOARD OF DIRECTORS RECOMMENDS A VOTEFOR PROPOSAL 2.

    PROPOSAL 2: To approve the authorization of an aggregate of 15 million shares of our Common Stock for issuance under our 2003 Employee Stock Purchase Plan.

    ¨ FOR

    ¨ AGAINST

    ¨ ABSTAIN

    THE BOARD OF DIRECTORS RECOMMENDS A VOTEFOR PROPOSAL 3.

    PROPOSAL 3: To ratify the selection of KPMG LLP as our independent auditors for the year ending December 31, 2003.2004.

    ¨ FOR

    ¨ AGAINST

    ¨ ABSTAIN

    THE BOARD OF DIRECTORS RECOMMENDS A VOTE OFAGAINSTABSTAIN ON PROPOSAL 4.3.

    PROPOSAL 4:3: To vote on the stockholder proposal to adopt and disclose an "equity policy" designatingrequesting that the intended useBoard of equity in management compensation programs and requiring that a portion of stock option grants be performance-based.

    ¨ FOR

    ¨ AGAINST

    ¨ ABSTAIN

    THE BOARD OF DIRECTORS RECOMMENDS A VOTEAGAINST PROPOSAL 5.

    PROPOSAL 5: To vote on the stockholder proposal toDirectors adopt a policy thatof expensing the cost of future employee and director stock options be recognized in our annual income statement.

    ¨ FOR

    ¨ AGAINST

    ¨ ABSTAIN

    (If you have selected Alternative A, please go directly to the signature line on this page.)

    B.¨ Deliver a proxy card to ___________________________ to act for and on behalf of the undersigned at the Annual Meeting with respect to all the exchangeable shares of Siebel Janna Arrangement, Inc. held by the undersigned on the record date for the Annual Meeting with all the powers that the undersigned would possess if present and acting thereat including the power to exercise the undersigned's voting rights at the Annual Meeting or any postponement or adjournment thereof.

    Executed on this _____ day of _____________, 2003.

    2004.

    Signature:
    Print Name:

    Signature:
    Print Name:

    NOTES:

    1. (1) A holder of exchangeable shares has the right to appoint a person to represent him or her at the Annual Meeting by inserting in the space provided the name of the person the stockholder wishes to appoint. Such person need not be a holder of exchangeable shares.

    2. (2) To be valid, this Voting Instruction Card must be signed and deposited with Computershare Trust Company of Canada, Corporate Trust Services, Attention: Manager of Client Services,Proxy Department, 100 University Avenue, 8th9th Floor, Toronto, Ontario, MFJM5J 2Y1 in the enclosed return envelope (postage prepaid if mailed in Canada) prior to 5:00 p.m., Toronto time, on June 9, 200321, 2004 or, if the Annual Meeting is adjourned, 48 hours (excluding Saturdays, Sundays and holidays) before any adjourned Annual Meeting.

    3. (3) If an individual, please sign exactly as your exchangeable shares are registered. If the holder is a corporation, this Voting Instruction Card must be executed by a duly authorized officer or attorney of the holder and, if the corporation has a corporate seal, its corporate seal should be affixed. If exchangeable shares are registered in the name of an executor, administrator or trustee, please sign exactly as the exchangeable shares are registered. If the exchangeable shares are registered in the name of the deceased or other stockholder, the stockholder's name must be printed in the space provided. This Voting Instruction Card must be signed by the legal representative with his or her name printed below his or her signature and evidence of authority to sign on behalf of the stockholder must be attached to this Voting Instruction Card. In many cases, exchangeable shares beneficially owned by a holder (a "Non-Registered Holder") are registered in the name of a securities dealer or broker or other intermediary, or a clearing agency. Non-Registered Holders should, in particular, review the section entitled "Non-Registered Holders" in the accompanying Notice to Exchangeable Stockholders and carefully follow the instructions of their intermediaries.

    4. (4) If a share is held by two or more persons, each should sign this Voting Instruction Card.

    5. (5) If this Voting Instruction Card is not dated in the space provided, it is deemed to bear the date on which it is mailed to the stockholder.








    NOTICE TO HOLDERS OF EXCHANGEABLE SHARES

    Our records show that, as of April 14, 2003,29, 2004, the record date for the determination of holders of exchangeable shares, you owned exchangeable shares of Siebel Janna Arrangement, Inc., an Ontario corporation. The exchangeable shares provide you with economic and voting rights which are, as nearly as practicable, equivalent to those of holders of shares of Common Stockcommon stock of Siebel Systems, Inc., a Delaware corporation (the "Company"), the U.S. parent of Siebel Janna Arrangement, Inc., including the right to attend and vote at meetings of the common stockholders of the Company. The Company will be holding its Annual Meeting of Stockholders (the "Annual Meeting") on June 11, 2003, to be held as an audio-only webcast,23, 2004, to: (1) elect threefour directors to hold office until the 20062007 Annual Meeting of Stockholders; (2) approve the authorization of an aggregate of 15 million shares of Common Stock for issuance under the Company's 2003 Employee Stock Purchase Plan; (3) ratify the appointment of KPMG LLP as the Company's independent auditors for the year ending December 31, 2003; (4)2004; and (3) vote againston the stockholder proposal to adopt and disclose an "Equity Policy" designatingrequesting that the intended use of equity in management compensation programs and requiring that a portion of stock option grants be performance-based; and (5) vote against the stockholder proposal toBoard adopt a policy that a significant portionof expensing the cost of future employee and director stock option grants to senior executives shall be performance-based.options in our annual income statement.

    At such Annual Meeting you will have voting rights, as described below, equal to the number of exchangeable shares you hold. You are permitted to instruct Computershare Trust Company of Canada, the Trustee under the Voting and Exchange Trust Agreement and First Supplemental Trust Agreement thereto among the Company, Siebel Janna Arrangement, Inc. and the Trustee, as supplemented, as to how the Trustee is to vote your exchangeable shares at the Annual Meeting. If you do not give voting instructions, the Trustee will not be entitled to exercise the voting rights attached to your exchangeable shares. Alternatively, you may instruct the Trustee to give you or a person designated by you a proxy to exercise the voting rights attached to your exchangeable shares during the meeting. The Trustee will then deposit this proxy with the Company. If you do not instruct the Trustee to give you or your designee a proxy, you or the person designated by you will not be entitled to vote during the meeting. If you instruct the Trustee to give you or your designee a proxy, in order to vote during the meeting, you or the person designated by you should log on to www.siebel.com/investor, at least 15 to 20 minutes prior to the start time to register to attend the meeting and should fax a completed proxy form (also enclosed) to the Company at (650) 477-5205 while the polls remain open. The proxy should be signed by the person whose name appears on the voting instruction form provided to the Trustee. Signed proxies received from persons named in a properly completed voting instruction form prior to the close of voting will be counted.

    To instruct the Trustee as to how you wish to exercise your voting rights, you must complete, sign, date and return the enclosed Voting Instruction Card to the Trustee by 5:00 p.m., Toronto time, on June 9, 200321, 2004 or if the Annual Meeting is adjourned, 48 hours (excluding Saturdays, Sundays and holidays) before any adjourned Annual Meeting. A return envelope (which is postage prepaid if mailed in Canada) is enclosed for that purpose. Whether or not you expect to attend the online annual meeting, please sign, date and return the Voting Instruction Card in the envelope provided to ensure that your exchangeable shares will be represented at the Annual Meeting.

    You have the right to revoke any instructions to the Trustee by giving written notice of revocation to the Trustee or by executing and delivering to the Trustee a later-dated Voting Instruction Card. No notice of revocation or later-dated Voting Instruction Card, however, will be effective unless received by the Trustee prior to 5:00 p.m., Toronto time, on June 9, 200321, 2004 or if the Annual Meeting is adjourned, 48 hours (excluding Saturdays and holidays) before any adjourned Annual Meeting.

    Non-Registered Holders

    Only registered holders of exchangeable shares of Siebel Janna Arrangement, Inc. are permitted to instruct the Trustee as to how to vote their exchangeable shares at the Annual Meeting or to attend and vote at the Annual Meeting via fax or by proxy as described above. You may be a beneficial owner of exchangeable shares (a "Non-Registered Holder") if your exchangeable shares are registered either:

    1. (1) in the name of an intermediary (an "Intermediary") with whom you deal with in respect of the exchangeable shares, such as, among others, banks, trust companies, securities dealers or brokers and trustees or administrators of self-administered Registered Retirement Savings Plans (RRSPs), Registered Retirement Income Funds (RRIFs), Registered Education Savings Plans (RESPs) and similar plans; or

    2. (2) in the name of a clearing agency (such as The Canadian Depository for Securities Limited) of which the Intermediary is a participant.

    The Company has distributed copies of the Notice of Meeting, the Proxy Statement dated May 12, 200321, 2004 and the Notice to Exchangeable Stockholders (collectively, the "Meeting Materials") to Intermediaries who are required to forward these Meeting Materials to Non-Registered Holders unless a Non-Registered Holder has waived the right to receive them. If you are a Non-Registered Holder who has not waived the right to receive Meeting Materials you will be given either:

    1. (1) a Voting Instruction Card which has already been signed by the Intermediary (typically by a facsimile, stamped signature) which is restricted as to the number of exchangeable shares beneficially owned by you but which is otherwise uncompleted. This Voting Instruction Card need not be signed by you. In this case, if you wish to direct the voting of the exchangeable shares held by you or attend and vote via fax during the Annual Meeting (or have another person attend and vote via fax on your behalf) you should properly complete the Voting Instruction Card and deposit it with Computershare Trust Company of Canada, Corporate Trust Services, Attention: Manager of Client Services,Proxy Department, 100 University Avenue, 8th9th Floor, Toronto, Ontario, MFJM5J 2Y1 prior to 5:00 p.m., Toronto time, on June 9, 200321, 2004 or if the Annual Meeting is adjourned, 48 hours (excluding Saturdays, Sundays and holidays) before any adjourned Annual Meeting; or

    2. (2) a voting instruction form which must be completed and signed by you in accordance with the directions on the voting instruction form (which may in some cases permit the completion of the voting instruction form by telephone).

    The purpose of these procedures is to permit you, as a Non-Registered Holder, to direct the voting of the exchangeable shares you beneficially own or to attend and vote at the Annual Meeting via fax or by proxy.Meeting. Non-Registered Holders should carefully follow the instructions of their Intermediaries and their service companies.

    A Non-Registered Holder may revoke a Voting Instruction Card or a voting instruction form given to an Intermediary at any time by written notice to the Intermediary, except that an Intermediary is not required to act on a revocation of a Voting Instruction Card or a voting instruction form that is not received by the Intermediary at least seven calendar days prior to the Annual Meeting.

    Information relating to the Company

    Exchangeable shares are exchangeable on a one-for-one basis for shares of Common Stockcommon stock of the Company and, among other things, you, as a holder of exchangeable shares, are entitled to receive dividends from Siebel Janna Arrangement, Inc. payable at the same time as and equivalent to, on a per-share basis, any dividends paid by the Company to holders of its shares of Common Stock.common stock. As a result of the economic and voting equivalency between the exchangeable shares and shares of Common Stockcommon stock of the Company, you, as a holder of exchangeable shares, will have a participating interest determined by reference to the Company and not Siebel Janna Arrangement, Inc. (i.e., the value of exchangeable shares is dependent on the assets and operations of the Company and not Siebel Janna Arrangement, Inc.). Accordingly, it is information relating to the Company that is relevant to you, and enclosed in this package is the Company's Proxy Statement for the Annual Meeting of Stockholders to be held on June 11, 2003,23, 2004, which you should read carefully.


    San Mateo, California
    May 12, 200321, 2004