The background calendaring agent failed to logon to the MDB, or create a session object on the MDB:. The error code is .The rendering of large calendars with the web client or Microsoft Internet Explorer for the mailbox with GUID: will be slower.For more information, click http://www.microsoft.com/contentredirect.asp.

Details
Product: Exchange
Event ID: 8255
Source: EXCDO
Version: 6.5.6940.0
Message: The background calendaring agent failed to logon to the MDB, or create a session object on the MDB:<GUID>. The error code is <error code>.The rendering of large calendars with the web client or Microsoft Internet Explorer for the mailbox <mailbox name> with GUID:<GUID> will be slower.For more information, click http://www.microsoft.com/contentredirect.asp.
   
Explanation
This event can occur when drive M is being scanned by antivirus software, or is being backed up by backup software.
   
User Action
Check that the Exchange Server directories and drive M are not being scanned by antivirus software. Also ensure that the Exchange Server folders and drive M are not being backed up by any kind of backup application. If the events continue to be generated, make a list of the mailboxes that are affected. This information is available in the description section of the event. You can then export these mailboxes to PSTs and import them back.

Related:

Leave a Reply