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Microsoft Exchange Server version 5.5 includes the following enhancements and new features.
Updated database structure for the information store and directory Microsoft Exchange Server uses an updated database that provides more robust data storage capabilities. Because of the new database structure, the information store is limited only by your system's hardware capacity.
Ability to retrieve deleted items from mailboxes and public folders Users can now retrieve deleted items in mailboxes and public folders if you set a deleted item retention period for the information store, mailbox, or public folder. Users can recover deleted items by using the Recover Deleted Items command in Microsoft Outlook(tm) version 8.03 or later. Recovered items are copied to the Deleted Items folder using mailboxes, or to the selected folder using public folders. For more information about retrieving deleted items, see Chapter 5, "Setting Up Mailboxes," Chapter 6, "Configuring Public Folders," and Chapter 8, "Setting Up Server Core Components and Properties."
IMAP4 Microsoft Exchange Server supports Internet Message Access Protocol Version 4rev1 (IMAP4rev1). For information, see Microsoft Exchange Server Operations.
Writeable LDAP Microsoft Exchange Server enables users to make changes to the directory by using Lightweight Directory Access Protocol (LDAP). For information, see Microsoft Exchange Server Operations.
Enhanced protocol support for the Internet Mail Service The Internet Mail Service supports the following protocols: ETRN, Secure Multipurpose Internet Mail Extensions (S/MIME), Secure Sockets Layer (SSL), and Simple Authentication and Security Layer (SASL). For information about how to configure these protocols for the Internet Mail Service, see Microsoft Exchange Server Operations.
Support for MHTML Microsoft Exchange Server supports MIME Hypertext Markup Language (MHTML), which is the MIME encapsulation of aggregate documents, such as an HTML document with inline pictures.
Microsoft Exchange Scripting You can install the Microsoft Exchange Event Service to support customized public folder workflow applications that you develop. For example, you can develop an application that performs an action when a specified event occurs in a public folder. For more information, see Chapter 6, "Configuring Public Folders."
Container level search control You can restrict users' access to Address Book views. For example, if you are hosting multiple companies on a single Microsoft Exchange Server computer, you can prevent users of one company from viewing the Address Book views of another company. For more information, see Microsoft Exchange Server Operations.
Support for multiple and differential offline Address Books Users can also download differential entries in offline Address Books, so that only changes that occurred since the last download are downloaded. For more information, see Chapter 7, "Setting Up Your Site."
Advanced security You can set multiple password policies that prevent administrators from making changes to the Key Management (KM) server without authorization from one or more other administrators. Microsoft Exchange Server also supports trusted messages sent between organizations so that users can verify the source of messages sent from another organization. For more information, see Microsoft Exchange Server Operations.
Microsoft Cluster Server Microsoft Exchange Server supports Microsoft Cluster Server, which is included with Windows NT® Server. Microsoft Cluster Server provides fault tolerance in the event of hardware and software malfunctions. It ensures that if a Microsoft Exchange Server computer fails, another is available so mail delivery is never interrupted. Microsoft Cluster Server must be installed on the Microsoft Exchange Server computer to enable support for clustering.
Microsoft Exchange Chat Service Microsoft Exchange Server now includes chat services that enable users to interact with each other online, in real time. For more information, see What's New: Microsoft Exchange Chat Service and Microsoft Exchange Chat Service Operations.
SNMP Madman MIB Microsoft Exchange Server supports the Mail and Directory Management Management Information Base (MADMAN MIB) for use with Simple Network Management Protocol (SNMP) monitoring agents. For more information, see Microsoft Exchange Server Maintenance and Troubleshooting.
Lotus cc:Mail DB8 migration The Lotus cc:Mail source extractor supports Lotus cc:Mail version 5.x (DB6), and version 6.0 and version 8.0 (DB8). For more information, see Microsoft Exchange Server Migration.
Address space and routing enhancements Microsoft Exchange Server gives you more control over message routing. The Address Space property page on connectors has been enhanced to enable scoping restrictions on each address space specified. Each address space can be configured so that the connector routes messages that originate from anyone in the organization, routes only messages that originate from within the home site, or routes only messages that originate within the home server location. In addition, each MTA can be configured to use only the least-cost routes to deliver mail, so that if the least-cost route is not accessible, messages are returned with a non-delivery report (NDR). For more information, see Microsoft Exchange Server Operations.