MAPI call “OpenMsgStore” failed error in Exchange Server

MAPI is Messaging Application Programming Interface and in MS Exchange Server, MAPI uses different interface methods.

“OpenMsgStore” is one of the methods associated with IMAPISession interface that is used to open a message store in Exchange Server mailbox. This method results a reference that is passed to ImsgStore object for further access. After that we get access to our mailbox email items (received or sent).

There are instances when this method fails. Whenever method fails, an application log is generated that records Exchange Server computer events, which can be analyzed for knowing the root cause of failure. Corruption in the message store is the foremost reason for this behavior.

You may encounter the given event log description displaying in the application event log of Exchange Server computer:

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

Event ID for this error is 9175 and is specific to Microsoft Exchange Server 2000 and 2003.

Cause

Reason for this situation to occur is that the IS (Information Store) is not running or the mailbox store fails to mount. The Information Store may stop due to the following possible reasons:

• You might be using an expired evaluation version of Exchange Server
• The store is dismounted and/or corrupted
• The partition storing the IS files is less than or equal to 10 MB in size
• Information Store is in dirty shutdown state

Solution

Following points are recommended in such situations:

• Use the activated version of Exchange Server
• Backup your store and run ESEUTIL/p command to repair it. The command can delete the corrupted pages and cause data loss.
• Check for IS partition is greater than 10 MB in size
• Replay all the transaction log files for the affected mailbox store

If all these points help you in repairing of Exchange Server, then it’s well and good. Otherwise you would be requiring professional Exchange Recovery software. They scan the corrupt database and repair the same efficiently and effectively. The software recovers deleted Exchange mailboxes, permanently deleted emails from the mailbox folders, and displays these items in Red color.

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