I have a strange problem with an individual user on our network. For some reason, he is unable to send or respond to meeting invites. The options are greyed out, He can create calendar entries, however if he adds and invitee he can no longer send or save the meeting.
We are running Entourage 2008 on about five Mac's and he is the only one having this problem. Entourage is at version 12.3.1 (110725), higher than the previously documented fix as described here (http://www.tuaw.com/2008/10/30/microsoft-releases-office-2008-update-to-fix-entourage-issue/
). I have also tried stopping the Microsoft Database Daemon, deleting his Microsoft User Data, then reconfiguring Entourage for him.
Using Exchange's web interface also works fine, or our Citrix implementation, so it doesn't seem to be a problem with his account.