Unable to move mailboxes from Exchange 2000 to Exchange 2007
Posted on 2009-04-22
I have been just installed Exchange 2007 into our production environment and Im ready to start moving some old mailboxes off our Exchange 2000 server onto the new Exchange 2007 server. The first mailbox I want to move is my test user. When I try to move the mailbox, I get the following message:
Error was found for Jones, Bob (email@example.com) because: Error occurred in the step: Opening source mailbox. Failed to open mailbox with error: ClassFactory cannot supply requested class, error code: -1056749262.
I have done some research on this and everything I have read instructs me to make sure the user account for the mailbox Im moving is not disabled and that the user shows up in the global address list. I have done all this and the account is active and the user is not being hidden from the GAL.
Any ideas what else may be causing this error?