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Are you using 10.4 or 10.5? I'd think in 10.5 that moving the message shouldn't be a problem -- the messages have a URL (it's actually a GUID) associated with them, and thus when OF tries to connect back, Mail should be able to find the message regardless of where it is.

There is a longstanding but, and I don't know whether it has been fixed yet, but specifically messages that were sent from Microsoft Entourage don't work properly with the link back. Check to see what the user agent was that SENT the message to you. You may have to show all headers, but then you will see something like this as the User-Agent:

User-Agent: Microsoft-Entourage/

If you see something like that in common with the messages that aren't working, pile on with the feedback ;-)