Offline Enables Address clients to Book (OAB) download Retrieval File full and Format incremental versions of the OAB. Standards Support Protocol Extensions Exchange servers support a number of different standard protocols for e-mail (POP3, SMTP, IMAP4, and WebDAV) and directory information (LDAP). The protocol extensions in this table describe extensions to these standards primarily for authentication and authorization. Protocol extension Short name Description name Internet Provides an Message authentication Access mechanism Protocol based on the , Version 4 a mechanism (IMAP4) to allow a to Extensions access a mailbox, and support for the IMAP UIDPLUS extension described in . Lightweight Extends Directory LDAPv3, which Access enables Protocol directory (LDAP) access. Version 3 Extensions Post Office Extends POP3, Protocol as described in Version 3 , which (POP3) enables the Extensions listing and downloading of mail. Simple Mail Extends SMTP Transfer standards to Protocol facilitate (SMTP) authentication Extensions and negotiation between a client and a server and to enable the
Offline Address Book (OAB) Retrieval File Format Enables clients to download full and incremental versions of the OAB. Standards Support Protocol Extensions Exchange servers support a number of different standard protocols for e-mail (POP3, SMTP, IMAP4, and WebDAV) and directory information (LDAP). The protocol extensions in this table describe extensions to these standards primarily for authentication and authorization. Protocol extension name Description Short name Internet Message Access Protocol Version 4 (IMAP4) Extensions Provides an authentication mechanism based on the , a mechanism to allow a to access a mailbox, and support for the IMAP UIDPLUS extension described in . Lightweight Directory Access Protocol (LDAP) Version 3 Extensions Extends LDAPv3, which enables directory access. Post Office Protocol Version 3 (POP3) Extensions Extends POP3, as described in , which enables the listing and downloading of mail. Simple Mail Transfer Protocol (SMTP) Extensions Extends SMTP standards to facilitate authentication and negotiation between a client and a server and to enable the