|Message:||Calendaring agent failed with error code thread id while expanding recurring appointments.|
|The Event 8207 indicates that the Calendaring Agent on the Exchange Server
encountered an unexpected problem while processing a recurring appointment in the Calendar folder of the mailbox. This failure can occur for a variety of reasons and the error code in the Description section of the event will indicate the underlying cause of
the failure to delete. For example, error 0xfffffa1d maps to JET_errColumnNotFound. Please use the ERROR.EXE program from the Exchange 2000 CD to get details on the error.This error is seen if there is a corruption of the Calendar items in a mailbox or if the Calendar Folder on the mailbox is not accessible due to permissions issues or if there is a corruption in the database that the mailbox is homed on. Also, if the Exchange Installable File System (IFS) Drive (also called M Drive) is being scanned by a file level Virus Scanner (or has been scanned so in the past), then this error might be seen.
Ensure you have applied the latest Exchange 2000 Service pack. Service packs
might include fixes for the EXCDO component (or other related components) and
may fix the problem.
Re-register the following DLL files using the REGSVR32.EXE program:
Check to see if any kind of File Level Antivirus Scanner is scanning the M
Drive. If so, configure the Antivirus software to exclude the M Drive (and also
the Exchange Database and log directories) from a file level scan. You may have
to reboot the server after making this change. Contact the Antivirus vendor for
If the errors persist after the above changes, then you may have to run some
maintenance utilities on the Exchange 2000 databases. Please contact Microsoft
Product Support Services before performing this action.