Hillert and Co. Selects Siebel CRM OnDemand for Integrated Marketing Campaigns

Siebel Enables Marketing Agency to Deliver Improved Campaign Management to Customers

SAN MATEO, Calif.-November 7, 2005 - Siebel Systems, Inc. (NASDAQ: SEBL), a leading provider of customer-facing solutions, today announced that Hillert and Co., an integrated marketing communications agency, has selected Siebel CRM OnDemand as its hosted CRM solution. The agency anticipates benefiting from Siebel’s out-of-the-box campaign management and integrated analytic functions.

Hillert specializes in creating and delivering integrated communications campaigns for its customers. As a full-service marketing firm, Hillert is composed of three divisions-advertising, interactive marketing, and mobile marketing. Founded in 1999, Hillert has offices in Munich and Frankfurt, Germany.

"Today, marketing is no longer effective without professional IT support. With Siebel CRM OnDemand, we have dramatically shortened the timeline between campaign planning and realization" said Christian Ehl, Managing Director of Hillert and Co. "Thanks to Siebel partner T-Systems, our hosted CRM system was up and running within two weeks. We also greatly appreciate the option of being able to switch at any time in the future to an on-premise Siebel solution, without the loss of data, interruption to business velocity, or additional cost"

Using the hosted CRM solution, Hillert is able to plan, operate, and then evaluate every step of an integrated marketing campaign and to maintain a view of the "big picture"-an understanding of how every element in a campaign can impact the campaign’s overall success. Through the adoption of Siebel CRM OnDemand, Hillert is able to focus on providing its customers with fully optimized communications campaigns and can evaluate the value-add from each step.

Siebel’s hosted software solutions and deployment capabilities are a critical enabler of its new Customer Adaptive Solutions Applications Strategy and Architecture. Companies embracing Siebel Customer Adaptive Solutions will be able to more effectively and quickly anticipate customer needs, realign their customer-facing business processes for systemic and consistent improvement, and direct the right actions across their businesses to maximize customer satisfaction and profitability.
About Siebel CRM OnDemand

Siebel CRM OnDemand is a hosted CRM offering delivered over the Web and accessible from an Internet browser at a fixed price per user per month. Customers can deploy Siebel CRM OnDemand quickly, easily, and affordably without any up-front IT investments. Hosted by IBM, Siebel CRM OnDemand delivers complete sales, marketing, and service functionality; built-in customer analytics; virtual call center technology; embedded best practices; and world-class hosting services and support. Siebel CRM OnDemand is now available for purchase. For more information, visit www.crmondemand.com.
About Siebel Systems

Siebel Systems is a leading provider of customer-facing solutions that deliver demonstrable business results and long-term competitive advantage. Siebel’s multichannel offerings allow organizations to intelligently manage and coordinate all customer interactions across the Web, contact center, field sales/service force, branch/retail network, and indirect and partner distribution channels. Siebel solutions draw upon the company’s best-in-class capabilities in customer relationship management (CRM), business intelligence, and customer data integration and can be deployed as licensed software or as a hosted service. Siebel solutions are tailored to the unique needs of 23 industries and incorporate industry-specific business processes, best practices, and business insight. They are the product of more than $2 billion in R&D investments and reflect over 11 years of experience with more than 4,000 organizations. Together with its extensive global network of alliance partners, Siebel provides the people, process, and technology expertise critical in driving business value from the deployment of customer-facing solutions. Over 3.4 million users worldwide in organizations of all sizes depend on Siebel solutions to deliver dramatic improvements in how they identify, acquire, retain, and serve customers. For more information, visit www.siebel.com.


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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.

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Shabana Khan

Siebel Systems, Inc.

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