One user out of over 500 has a problem. But this one user does tend to use each and every feature of the software and report every fault, so it doesn't mean others don't have the same problem. We use MS Exchange 2010, MS Office 2010 including MS Outlook 2010. The problem has been since we upgraded to this setup from Exchange and Office 2003.
Outlook 2010 will crash (close) when the user tries to decline a meeting that has already been accepted on his behalf by a PA and he tries to include comments. We can reproduce the problem on OWA, but it doesn't happen if he doesn't try to comment.
The secretary was set as a delegate on the old system. After this problem was experienced, we have changed this on Exchange 2010 to give her Full Access Permission. We have also run mailbox and calendar cleanup on both the user and his PAs accounts.
My answer was to not comment when declining and to send a seperate email. He didn't like that and as he is a rather senior manager I need a better response. Any ideas?