Microsoft Windows Server 2003 for Small Business Server Microsoft Exchange Mail Store unmounts

At 08:59hrs this morning I got a call from a customer who was unable toreceive e-mail. Logging into their server I discovered that there wereindeed messages stuck in the Local Delivery queue. I checked theApplication event logs and found the following event log EventType:ErrorEventSource:MSExchangeSAEventCategory:MAPI Session EventID:9175Date:8/05/2012Time:9:12:31AMUser:N/AComputer:***DELETED***Description:TheMAPI call ‘OpenMsgStore’ failed with the following error: Theattempt to log on to the Microsoft Exchange Server computer hasfailed.

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