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Error during mailbox migration Exchange 2003 to Exchange 2007

June 7, 2010 by Wayne Small Leave a Comment

I was doing a migration today for a client and whilst using the Exchange Management Console on Exchange 2007 to move their mailboxes, I got the following error for 9 of the users mailboxes. 

Error was found for Username(user mail address) because: Error occurred in the step: Opening source mailbox. Failed to open mailbox with error: ClassFactory cannot supply requested class, error code: -1056749262

A little investigation showed that this was due to the users account being disabled.  I used the Active Directory Users and Computers MMC to enable the users accounts.  You then need to wait around 30minutes for AD replication to take place, and you MIGHT also need to restart the Information Store on the source server.

Further issues were found with some other users that had their mailbox permissions totally messed up. These had to be manually fixed before they could be relocated to the new server.

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Filed Under: Blog Tagged With: Migration, SBS 2008

About The Author

Wayne has been working with Microsoft Server products in the SMB market for over 20 years. He has a passion for technology and been a Microsoft MVP for over 15 years. Read More…

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