We are running an exchange 2000 server with Outlook 2002 clients. I have
only one user who is having an issue:

He will create an appoinment to several users. The appoinments go out fine.
But if he recalls, changes or updates the appointment, an error message gets
generated as an email stating that several users do not exist. The list
fluctuates a little, but there are 2 in the list that are always on the list.
I have racked my brain and cannot find a resolution to this issue. I have
performed a re-install of Office, a repair install of office, deleted cache,
deleted contact list and checked it, defragged, checked for malwayre, used
every search parameter I can think of and I am unable to find anything even
close to tis issue.

Can someone please assist us with this, this user is really on my back about
it, this feature is probably the only one he really knows how to use the
best! LOL

Any help would be appreciated.