In Exchange 2010, you might come across the following error message logged consistently in the event log for a mailbox:

Mapi session exceeded the maximum of 250 objects of type “objtMessage”

Exchange 2010: mapi session exceeded the maximum of 250 objects of type "objtmessage"
Exchange 2010: Mapi session exceeded the maximum of 250 objects of type "objtMessage" 1

The best option will be to investigate outlook add-ins or AV or something scanning the mailbox on the machine.

Take note this will affect access to the mailbox.

Hope it helps.

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