One of our users was having exchange difficulties so I got the bright idea of moving their messages off to a PST file and then deleting their profile and making a new one then transferring the messages back. It all worked out great and it even seemed to fix some problem, but now if anyone replies to a old email there is a send error as exchange can't seem to find the user anymore despite being setup with the exact same name/email. Is there a way to add some kind of alias or something that would fix this problem? My guess is that there is some kind of unique identifier that wasn't duplicated but I really don't know.
I have access to their account before it was deleted. So I can look up settings.