Event Category:MAPI Session
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
How to Start the Microsoft Exchange Information Store Service (MSExchangeIS)
How to Mount an Exchange Store