Status of Exchange 2000 Server and Exchange Server 2003 components on a server cluster (259197)

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Component	Functionality	Notes
Exchange system attendant	Active/active	Multiple virtual servers for each node.
Information store	Active/active	After failover, each node is limited to four storage groups.
Message transfer agent (MTA)	Active/passive	One instance for each cluster. The MTA is in only one cluster group.
POP3	Active/active	Multiple protocol virtual servers for each node.
IMAP	Active/active	Multiple protocol virtual servers for each node.
SMTP	Active/active	Multiple protocol virtual servers for each node.
HTTP	Active/active	Multiple protocol virtual servers for each node.
NNTP	Not supported
Key Management Service	Not supported	(This component does not run on Exchange 2003 at all.)
Full-text indexing	Active/active
Instant Messaging	Not supported	(This component does not run on Exchange 2003 at all.)
Chat	Not supported	(This component does not run on Exchange 2003 at all.)
Exchange Connector for Novell GroupWise	Not supported
Exchange Connector for Lotus Notes	Not supported
Exchange Connector for Lotus cc:Mail	Not supported	(This component does not run on Exchange 2003 at all.)
Exchange Connector for Microsoft Mail	Not supported
Exchange Connector for IBM OV/VM (PROFS)	Not supported
Exchange Connector for SNADS	Not supported
Microsoft Exchange Event	Not supported
Exchange Conference Server (ECS)	Not supported	(This component does not run on Exchange 2003 at all.)
Exchange Calendar Connector	Not supported

Microsoft Exchange Conferencing Server Service Pack 1 has a built-in failover mechanism that is separate from MSCS. The mechanism permits you to install and to define a backup conferencing server. If the active host server fails, a polling mechanism alerts the backup server and it assumes the role of the active host server.