When reviewing the logfile after migrating a GroupWise mailbox or an archive into an Exchange mailbox or a PST file, the following error might be seen:
12:09:19 ERROR: [5002-21-162-80020009] Unable to migrate attachment 'Mime.822' of message "Messagesubject' in folder 'Foldername'
12:09:19  Exception occurred.
12:09:19 Source: Attachment.Object
12:09:19 Description: Could not save attachment to a file
The GroupWise message item might not have an attachment at all but active HTML content.
This error might be harmless and can be disregarded.