Siebel ERM Delivers Market-Leading Portal Architecture with Every Siebel 7 Application

Next-Generation Architecture Provides Maximum Deployment Flexibility and Lowest Total Cost of Ownership

SAN MATEO, Calif. June 26, 2002 - Siebel Systems, Inc. (Nasdaq: SEBL), the
world's leading provider of eBusiness applications software, today announced
that the next-generation portal architecture embedded in every Siebel 7
application streamlines customer deployments, increases user acceptance, and
reduces the total cost of ownership. The Siebel 7 Portal Architecture
provides Siebel customers with ultimate deployment flexibility by both
enabling external applications to be seamlessly displayed within the Siebel
7 portal and by enabling access and display of content from any Siebel 7
application through any other third-party portal.

"Siebel customers rely on us to not only provide industry-leading
applications that drive corporate performance, but also to provide an
architecture that allows them to utilize their existing applications," said
Stacey Lawson, Vice President and General Manager for Siebel ERM. "Many
companies are looking to standardize on an industry-leading portal
architecture, while other companies already have portals and are looking for
rich applications to make them more useful. The Siebel 7 Portal Architecture
enables our customers to benefit from the rich Siebel 7 application suite
while leveraging existing systems and business processes. Providing our
customers with the ability to deploy a single, unified interface to their
users streamlines implementation and helps ensure long-term deployment
success."

Siebel 7 Delivers Market-Leading Portal Capabilities

The Siebel 7 Portal Architecture delivers best-of-class portal capabilities,
enabling Siebel 7 customers to deploy out-of-the-box applications to
employees, customers, and partners.

· Role-Based Corporate Communications Based on Company and User
Preferences - Enables companies to streamline and personalize communications,
news, and company information based on business rules and company
guidelines. Sophisticated role-based personalization exposes only relevant
information and application functionality to users. For example, all
employees may see general benefits information, while managers may have
greater access to employee compensation information for their direct
reports. End users can also personalize and customize their portal
experience by creating a profile of their preferences such as desired news,
competitive information, weather, stock updates, internal and syndicated
content, page layout, applications, etc.

· Built-In Single Sign-On and Authentication - Simplifies the end user
experience by providing employees with a single logon and user experience
across many different applications. The Siebel Portal Architecture offers a
native single sign-on solution that employs centrally managed domain hosts
with end user-managed login credentials. It also has validated integrations
with all leading third-party single sign-on and authentication providers.

· Streamlined Presentation Layer and Data-Level Integration - Supports
the display of third-party applications and content directly through Siebel
applets. Out-of-the-box connectors provide a flexible, easy-to-use
environment for creating additional third-party display applets.

· Sophisticated Knowledge Management and Rich Content - Provides rapid
access to the most relevant content, people and organizational and industry
knowledge. For instance, after searching on "Acme, Inc.," employees receive
rich information about the company, including external news, research
reports, services requests, sales opportunities, and any employees that may
have worked for the company. Delivering robust third-party industry news and
content in multiple languages ensures that employees always have the latest
information on their customers, business initiatives, or areas of interest.

· Configurable, Interactive Workflow - Streamlines common business
processes by enabling organizations to define, automate, and manage
consistent, yet personalized workflows. A graphical drag-and-drop user
interface simplifies rapid customization of workflows, including the flow of
Web pages and user interactions based on user events and conditions,
enabling company business processes and rules to be updated in real time.
Siebel 7 Architecture Extends Evolution of Corporate Portals
In addition to embedding traditional portal capabilities in all Siebel 7
applications, the Siebel Portal Architecture introduces next-generation
capabilities that are driving the evolution of the corporate portal.

· Smart Web Architecture - Provides a zero-footprint, highly interactive
Web client that operates in a Web browser. Organizations gain the cost
savings associated with administering a zero-install Web-based application,
while providing users with the rich, interactive, productive experience
usually available only from a desktop application. Users can invoke familiar
user interface metaphors, such as dragging and dropping elements on a page,
selectively updating portions of a page based on the data that changes,
selecting a record to edit inline, validating data entry without making a
server round trip, and automatically saving information when focus shifts to
another part of the application.

· Prepackaged Business Process Integration - Universal Application
Network, the industry's first standards-based, vendor-independent
application integration solution, delivers out-of-the-box solutions for
mission-critical business processes such as customer, partner, employee, and
product life cycle management and order management. These prepackaged
business processes are extensible and independent of the underlying
applications and support both intra- and inter-enterprise processes
providing organizations with choice, flexibility, and scalability while
reducing costs, complexity, and time to deployment.

· Seamless Offline Access - Allows users to work with or without a
network connection and ensures that all offline modifications are
automatically updated the next time the user connects through Siebel
Systems' patented data synchronization technology.

· Market-Leading Session Management - Captures application sessions as
users navigate in and out of multiple applications, minimizing interruptions
and providing a fluid user experience. Siebel Systems' market-leading
session management capabilities enhance network utilization, performance,
and end user satisfaction.

"Siebel ERM allows us to focus our employees on our core business," said Jay
Sarles, Vice Chairman and Head of Wholesale Banking, FleetBoston Financial.
"The ERM 'Business Advisor' differs from a traditional employee portal in
that it provides a rich set of applications and information for business
purposes. This makes it easy and compelling for wholesale banking employees
to access the news, company, and market information they need every day to
best serve our customers. In fact, we have projected a return on investment
of 300 percent from our Siebel ERM deployment. The products have been
integral in supporting our new programs and channels to increase
cross-selling and drive increased revenue."

Siebel 7 Portal Architecture Ensures Lowest Total Cost of Ownership
The Siebel 7 Portal Architecture delivers the lowest total cost of ownership
by reducing customization, integration, maintenance, and scalability costs.
Unlike traditional portal frameworks that simply provide a toolkit
environment for accessing underlying content and software applications, the
Siebel 7 Portal Architecture enables customers to leverage the
out-of-the-box, pre-integrated business processes and applications in Siebel
7, minimizing the need for custom development and reducing the cost of
maintenance.

With the Siebel 7 Portal Architecture, customers can utilize their existing,
heterogeneous systems alongside Siebel 7's industry-leading applications.
Universal Application Network provides a standards-based, customer-centric
solution that solves the complex multi-application integration problem
within and across the enterprise in a highly cost-effective way. The result
is a vendor-independent solution that dramatically reduces the need for
customization, minimizes complexity, speeds deployment, and delivers a low
total cost of ownership.

About Siebel Systems 
Siebel Systems, Inc. is the world's leading provider of eBusiness
applications software. Siebel Systems provides an integrated family of
eBusiness applications software, enabling multichannel sales, marketing, and
customer service systems to be deployed over the Web, in call centers, in
the field, through reseller channels, and across retail and dealer networks.

Siebel Systems' sales and service facilities are located in more than 32
countries. For more information, please visit Siebel Systems' Web site at
www.siebel.com.

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Media Contact:
Cassie Divine
Access Communications for Siebel Systems, Inc.
415-844-6248
cdivine@accesspr.com