Out of Office Assistant won't load

I just completed a migration from 5.5 to Exchange 2000 using NETIQ Migrator. Quite a few of my users now can't open OOA. Some of these users had the assistant enabled during the migration. They get an error: The OOA could not be displayed. A required action was not successful due to an unspecified error.

I have tried repairing and reloading Outlook XP, It's fully patched with SP2. My Exchange server has SP3.
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SimonL-UKConnect With a Mentor Commented:
A rule could of been corrupted on the migration.  Use the Mailbox Manager to delete the OOF/OOA rules - I think you need to search for OOFRULES
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