Event 9175: The MAPI Call 'OpenMsgStore' Failed with the Following Error

Applies to: Microsoft Exchange Server 2003 Enterprise EditionMicrosoft Exchange Server 2003 Standard Edition


The following event may be logged in the Application event log on a computer that is running Exchange 2000 Server or Exchange Server 2003:
Event Type:Error
Event Source:MSExchangeSA
Event Category:MAPI Session

Event ID:9175
Time:8:21:36 PM
The MAPI call 'OpenMsgStore' failed with the following error:

The Microsoft Exchange Server computer is not available. Either there are network problems or the Microsoft Exchange Server computer is down for maintenance. The MAPI provider failed.
Microsoft Exchange Server Information Store
ID no: 8004011d-0526-00000000


This issue can occur if the information store is not running. When the information store is stopped and the System Attendant is still running, the System Attendant keeps the MAPI session active. This issue can also occur if a mailbox store failed to mount.


To resolve this issue, verify that the information store is running. If the store is not running, attempt to start it. If the information store is running, and the event is still logged, verify that the mailbox stores are mounted. If they are not mounted, attempt to mount them.

How to Start the Microsoft Exchange Information Store Service (MSExchangeIS)

How to Mount an Exchange Store


Microsoft has confirmed that this is a problem in Microsoft Exchange 2000 Server and Microsoft Exchange Server 2003.