AstraZeneca UK Selects Siebel Pharma to Create ''One Clear View of the Customer''.

SAN MATEO, Calif. -- Leading Pharmaceutical Company in the UK Standardizes on Siebel Pharma to Increase Market Share, Customer Satisfaction, and Operational Efficiency

Siebel Systems, Inc. (NASDAQ:SEBL), a leading provider of business applications software, today announced that AstraZeneca UK has selected Siebel Pharma, including Siebel Pharma Analytics and Siebel Pharma Handheld, to create a comprehensive view of its customers across multiple channels and disciplines. The leading pharmaceutical company is deploying the Siebel applications to its sales and marketing professionals, executives, and medical information team members.

AstraZeneca is one of the world's leading pharmaceutical companies, providing innovative, effective medicines designed to fight disease in important therapeutic areas such as oncology, respiratory medicine, gastrointestinal medicine, and cardiovascular medicine. "As AstraZeneca UK launches new brands, acquires more customers, and enters new markets, the process of managing customer relationships becomes more and more complex," said Claire Price, Head of i-Solutions, AstraZeneca UK. "In this competitive market companies have to use the best technologies to stay ahead."

Siebel Pharma is the only software suite specifically designed to meet the customer-centric business process requirements of the pharmaceutical industry. The application provides best-in-class functionality to support business processes in field sales and management, account management, medical affairs, customer service, and marketing. Siebel Pharma enables pharmaceutical companies to capture every customer interaction across multiple channels, including call centers, marketing and field sales departments, and the Web. By integrating all critical customer-facing functions and analyzing customer information, Siebel Pharma ensures that organizations are prepared to maximize customer value, while delivering superior service. For more information on Siebel Pharma, please visit www.siebel.com/pharma.

Siebel Pharma Analytics delivers flexible and easy-to-use pharmaceutical analytical capabilities for managers and executives with the power to measure and evaluate business performance across customers, products, sales, marketing, and service and close the gap between strategy and execution. Siebel Pharma Handheld provides sales representatives a comprehensive tool for targeting, call planning, and call reporting that can be deployed as a companion device or a stand-alone client.

Siebel Systems pioneered the industry-specific application model and today delivers 23 industry applications and more than 100 industry-specific solution sets. These solutions, which include Siebel Pharma, enable companies to establish a single, enterprise-wide view of their customers and execute key customer-facing business processes more efficiently and effectively.

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. For more information about Siebel Systems, Inc., please visit www.siebel.com.

For more information on Siebel Systems solutions and services, please visit our Web site: CRM -- http://www.siebel.com/crm; OnDemand Solutions -- http://www.crmondemand.com; Industry CRM -- http://www.siebel.com/industry-crm; Call Center and Service -- http://www.siebel.com/call-center; Sales Force Automation -- http://www.siebel.com/sales-force-automation; Marketing Automation -- http://www.siebel.com/marketing-automation; Business Intelligence -- http://www.siebel.com/business-intelligence; Integration Solutions -- http://www.siebel.com/integration-solutions; CRM Services -- http://www.siebel.com/crm-services.

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.