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When I try to mark an email as Not Junk in Outlook 2013, I typically get a dialog that says The operation cannot be performed because the message has been changed.
This happens about 90% of the time. The account in question is a Gmail account linked via IMAP. I can (obviously) mark the email as not spam successfully using Gmail's web interface. How can I fix this problem so I can mark items as Not Junk from Outlook itself?