This article was previously published under Q262456
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 Date: 5/8/2000 Time: 8:21:36 PM User: N/A Computer: Computer_name Description: 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 formaintenance.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)