S

schema: See directory schema.
security identifier (SID): A unique name that identifies a user logged on to the Windows NT security system. A security identifier can identify an individual user or a group of users.
server: A computer that provides shared resources to network users.
server application: An application written to run as a service of Windows NT Server on Microsoft Exchange Server. These applications are usually gateways, add-ins, or mailbox agents.
service: The services of Microsoft Exchange Server include the information store, the directory service, the message transfer agent (MTA), and the directory exchange agent (DXA). New services are also provided by new applications.
service provider: A component that allows client applications to use the services of the messaging system. A service provider typically offers address book, form management, message store, or transport services.
service control manager: A Windows NT Server process that manages all the services in the Windows NT Registry. See the Win32 Programmer’s Reference.
site: One or more Microsoft Exchange Server servers that provide services to a set of users. Sites can be centrally managed and can span physical locations.
site proxy address: The portion of a proxy address that corresponds to the site rather than to an individual user. For example, @trager.com might be the site proxy address for the Trager company.
Simple Mail Transfer Protocol (SMTP): The messaging standard used by the Internet to transfer mail.
SMTP address: An address within a foreign system whose type is SMTP.
source extractor: A program that reads directory, information store, or scheduling information from a foreign system and writes it into an intermediate file format (or into memory) so that it can be imported into a database of Microsoft Exchange Server.
synchronizer: Within ICS, a set of methods that export changes from an information store. See IExchangeExportChanges.
synchronization: See directory synchronization and incremental change synchronization.
synchronization state: A list of the hierarchy and content changes exported from and imported to a public folder. Using the synchronization state, the synchronizer can send any necessary delete requests for, and prevent duplicate exports of already exported data. This mechanism also lets the information store track imported data to prevent duplicate imports and re-exporting of imports. The developer of the synchronization system must choose a format for storing synchronization state information designed for use by both the collector and the synchronizer. The synchronization state should be supported through the Win32 IStream interface.