Stoal,
I have one correction, my user has Outlook 2000. Does your user use OWA to access email, use a laptop, would they possibly have setup multiple *.ost files? I'm just looking for some commonality to my problem. The NT account doesn't seem to matter. The settings of the email account don't seem to be the key because I made a copy of her exchange email account and the copy works, even when linked to her nt account. We are going to try to break another account by using OWA (although that hasn't worked so far) and by setting up multiple .ost files for synchronization. For support documents try looking under exchange extensions. The out of office assistant is part of the exchange extensions. As you know there isn't much on it, but there is some info on the extensions. Also I tried reinstalling the out of office add-in, but that didn't help either.