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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 |
Keywords: KB259197, kbinfo