Hi all,I am running MS Exchange 2003 SP2. This morning all the emails are stucked in the Local Delivery Queue. In the event viewer, there are many application logs regarding to Exchange database background cleanup. I have already applied the hotfix in http://support.microsoft.com/kb/919417a few days back. Today, the background cleanup error messages appear again. Please help.Event Type:WarningEvent Source:MSExchangeIS Public StoreEvent Category:Background Cleanup Event ID:9791Date:10/27/2009Time:10:05:28 AMUser:N/AComputer:SERVERDescription:Cleanup of the DeliveredTo table for database 'First Storage Group\Public Folder Store (SERVER)' was pre-empted because the database engine's version store was growing too large. 0 entries were purged. For more information, click http://www.microsoft.com/contentredirect.asp.Event Type:WarningEvent Source:MSExchangeIS Mailbox StoreEvent Category:Background Cleanup Event ID:9791Date:10/27/2009Time:10:05:28 AMUser:N/AComputer:SERVERDescription:Cleanup of the DeliveredTo table for database 'First Storage Group\GROUP' was pre-empted because the database engine's version store was growing too large. 0 entries were purged. For more information, click http://www.microsoft.com/contentredirect.asp.

Try to follow these steps http://www.eggheadcafe.com/software/aspnet/29557859/event-id9791---event-sou.aspxRaj

how big is your Exchange database? what is the amount of physical memory on the server? does the OLM co-incide with the backup schedule. you would want to do a complete online defrag in one of the weekends, and also make sure that the backup schedule does not co-incide with the OLM schedule. this can cause your version store to grow too large and dismount the database.