Infrastructure That Siebel CRM Desktop Uses
The following image illustrates the infrastructure that Siebel CRM Desktop uses.

Explanation of Callouts
The infrastructure, as shown in this image, that Siebel CRM Desktop uses includes the following items:
Siebel Database. Stores information about opportunities, contacts, service requests, accounts, and so on.
Siebel Server. Runs the server components for Siebel CRM Desktop and manages synchronization sessions with the Siebel Application Interface. Hosts the processes that Siebel CRM Desktop requires to support synchronization and handles incoming synchronization requests from the client through the Siebel Application Interface. For more information, see How Siebel CRM Desktop Uses the Siebel Enterprise.
Web Server. Acts as the Web server that establishes a user session with the Siebel Server. Handles incoming requests to Siebel Web services and helps route the client synchronization request to the proper component in the Siebel CRM infrastructure that supports the Web service. For more information, see About the Web Service API.
Laptop or Desktop. The computer where Siebel CRM Desktop is installed. Oracle implements Siebel CRM Desktop as the Outlook add-in. Siebel CRM Desktop deploys a binary add-in during installation that supports integration with Outlook, custom user interface capabilities, and the Synchronization Engine. Siebel CRM Desktop metadata is available in Outlook after you download and install the customization package from the Siebel Server. Siebel CRM data is available on the client computer after the first synchronization finishes. The customization package includes features that allow synchronization and customization. For more information, see Customizing the First Run Assistant.
Messaging Infrastructure. Handles local email, calendar items, contacts, and To Do items. The messaging infrastructure provides support for mobile access and Web access to information and for storing data. For more information, see How Siebel CRM Desktop Stores Siebel CRM Data.