I'm having an intermittent problem where email is queuing in the Local Delivery folder (2 or 3 mornings a week) - force connection and restart of the Information Store service temporarily resolves the problem. Event Manager reports the following -
The MAPI call 'OpenMsgStore' failed with the following error:
The attempt to log on to the Microsoft Exchange Server computer has failed.
The MAPI provider failed.
Microsoft Exchange Server Information Store
ID no: 8004011d-0512-00000000