Event ID: 9108
Event Type: Information
Event Source: MSExchangeSA
Event Category: (13)
Description: Offline Address List is being generated for \Global Address List.
Event ID: 9126
Event Type: Error
Event Source: MSExchangeSA
Event Category: (13)
Description: OALGen encountered error [0x80004005] while calculating this OAL. This OAL will not be available for client download. (\Global Address List)

Event ID: 9175
Event Type: Error
Event Source: MSExchangeSA
Event Category: MAPI Session
Description: The MAPI call ‘OpenMsgStore’ failed with the following error: The information store could not be opened. The logon to the Microsoft Exchange Server computer failed. MAPI 1.0 ID no: 80040111-0286-00000000

İlgili KB: http://support.microsoft.com/kb/315250/en-us