Antenna Launches A3 Solution for Siebel CRM OnDemand; Demonstrates Latest Wireless Solution at Siebel SMB Launch Event; Joins Siebel SMB Alliance Program.

JERSEY CITY, N.J. -- Antenna Software, Inc., a leading provider of wireless software solutions for the mobile enterprise, has announced it will deliver its award winning Antenna A3 solution for Siebel CRM OnDemand. In addition, Antenna Software, a validated Siebel CRM partner for over three years, has also joined the new Siebel SMB Alliance Program. Siebel Systems, Inc. (NASDAQ: SEBL) is the industry-leading provider of CRM solutions. E[acute accent]Antenna A3 delivers real-time wireless access to the critical Siebel CRM OnDemand features: account, contact, opportunity, service request and calendaring/task management to the most popular handheld devices including RIM BlackBerry(R), Palm Treo(TM) , Pocket PC-based PDAs, and Smartphones. E[acute accent]"Antenna's A3 solution solves the critical business challenges for field sales teams - full mobility, guaranteed access, and ease of use" said Jim Hemmer, CEO, Antenna Software, Inc. "Antenna has been the leader in delivering Enterprise-Class wireless solutions to Field Forces for over a decade. Now, combined with Siebel CRM OnDemand we look forward to providing the same benefits and positive return to small-and-medium sized businesses world-wide." E[acute accent]By combining the functionality and ease-of-use of Siebel CRM OnDemand, with the rich mobile services of Antenna A3, field sales teams have real-time access to critical account data, contacts, new leads, notifications, messages, alerts, and team activities, so they can not only stay mobile and productive, but have complete visibility and control over the entire sales process. E[acute accent]Most importantly, Antenna A3 is the only mobile enterprise solution that delivers true end-to-end support for wireless application deployment. By managing all the critical failure points of a mobile solution including multiple devices, carriers, and networks, Antenna A3 ends finger pointing among multiple vendors, allows organizations to focus on their business goals instead of complex infrastructure, and delivers impressive ROI very quickly. E[acute accent]"Tight integration between turnkey wireless solutions and enterprise systems is critical for workforce efficiency and competitive advantage," said Eugene Signorini, Yankee Group Wireless/Mobile Enterprise & Commerce program manager. "Antenna A3's streamlined delivery of mobile content from Siebel's OnDemand system provides significant value to organizations seeking a rapid return on their investment in wireless technology." E[acute accent]"We are pleased to add Antenna Software's proven mobile services to our comprehensive network of expert providers," Catherine Cherubino, Vice President Alliances, SMB, OnDemand, at Siebel Systems. "Antenna's proven technology enhances Siebel's solutions by meeting distinctive sales channel requirements and accelerating the sales process on an enterprise-wide level." E[acute accent]In order to provide an even wider range of front-office solutions for SMBs, Siebel Systems is extending its industry-leading alliance program to companies who have complementary solutions tailored for SMBs. By choosing Siebel SMB solutions and validated partner solutions, Siebel Systems' SMB customers can pursue a best-in-class strategy incorporating a variety of tailored offerings that are optimized for their business requirements. E[acute accent]The Siebel Validation Program applies rigorous technical scrutiny to evaluate the integration of third-party solutions with Siebel business applications. Solutions that meet the strict testing criteria are validated and documented by the Siebel Validation Program. Antenna Software has been a validated Siebel Partner since 2001.

E[acute accent]About Antenna Software

E[acute accent]Antenna Software is the largest, privately held mobile enterprise software solutions provider in North America with thousands of users worldwide. Headquartered in Jersey City, New Jersey, Antenna's products provide proven, powerful mobile solutions, which integrate enterprise-class business applications with global wireless network communications and management capabilities. Antenna supports a growing client base of leading service organizations throughout the world. Key customers include Pitney Bowes, L-3 Communications Security and Detection Systems, Siemens, Verizon, and Fujitsu.

E[acute accent]Except for the historical information contained herein, this press release contains forward-looking statements that involve risk or uncertainties. 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 customer relations, such as the availability of Siebel Systems' products and services, customer implementation of products and services, relationships with customers, third-party vendors and systems integrators, concentration of revenues in a relatively small number of customers, existence of errors or defects in products, ability to successfully manage growth, 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. E[acute accent]Siebel is a trademark of Siebel Systems, Inc. and may be registered in certain jurisdictions. All other product and firm names mentioned are the property of their respective owners and are mentioned for identification purposes only.