Siebel Systems to Present at UBS Software & IT Services Conference

Business Wire, May 19, 2004

Business Editors/High-Tech Writers

SAN MATEO, Calif.--(BUSINESS WIRE)--May 19, 2004

Siebel Systems, Inc. (Nasdaq:SEBL), a leading provider of business applications software, today announced that two of its executives will be presenting at the UBS Software & IT Services Conference on Tuesday, May 25, 2004. Ken Goldman, Senior Vice President, Finance & Administration and Chief Financial Officer, will present at 8:00 a.m. Eastern/5:00 a.m. Pacific, and Mike Betzer, Vice President and General Manager, CRM OnDemand, will participate in a panel discussion titled "Hosted CRM: To Be or Not To Be" at 9:10 a.m. Eastern/6:10 a.m. Pacific. The UBS Software & IT Services Conference is taking place at The Pierre Hotel in New York, NY.

Live and archived Webcasts of the discussions will be available at http://www.siebel.com/investor.> About Siebel Systems

Siebel Systems, Inc. is a leading provider of business applications software, enabling corporations to sell to, market to, and serve customers across multiple channels and lines of business. With more than 4,000 customer deployments worldwide, Siebel Systems provides organizations with a proven set of industry-specific best practices, CRM applications, market-leading analytics products, and business processes, empowering them to consistently deliver superior customer experiences and establish more profitable customer relationships. Siebel Systems' sales and service facilities are located in more than 30 countries.

Siebel is a trademark of Siebel Systems, Inc. and may be registered in certain jurisdictions. All other product and company names mentioned are the property of their respective owners and are mentioned for identification purposes only.

Except for the historical information contained herein, this press release contains forward-looking statements that involve risks and uncertainties. The success of the agreements and products described above and the future operating results of Siebel Systems may differ from the results discussed or forecasted in the forward-looking statements due to factors that include, but are not limited to, risks associated with new versions and new products, the availability of Siebel Systems' products and services, implementation of products and services, existence of errors or defects in products, rapid technological change, dependence on the Internet, significant current and expected additional competition and the need to continue to expand product distribution and services offerings. Further information on potential factors that could affect the financial results of Siebel Systems are included in Siebel Systems' Annual Report on Form 10-K, Quarterly Reports on Form 10-Q and its other filings with the Securities and Exchange Commission, which are available at www.sec.gov. Siebel Systems assumes no obligation to update the information in this press release.