When migrating to Exchange 2010 the above MAPI error is seen in the log file & migration fails. It is confirmed that the mailbox can be opened using Outlook under the service account credentials.
This can be due to Outlook 2003 being installed on the migration machine. Although it is possible to open mailboxes on Exchange 2010 using Outlook 2003, the migration tool requires the CDO components from Outlook 2007.
Uninstall Outlook 2003 from the migration machine & install Outlook 2007.
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