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Event ID: 8255 Source: EXCDO

The background calendaring agent failed to logon to the MDB, or create a session object on the MDB:<MDB>. The error code is <error code>. The rendering of large calendars with the web client or Microsoft Internet Explorer for the mailbox <mailbox> with GUID:<GUID> will be slower.
As per Microsoft: "This event can occur when drive M is being scanned by antivirus software, or is being backed up by backup software". See MSEX2K3DB for additional information about this event.
This problem could appear when the exchange store is down.

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