I have an issue with a few users that when they decline a meeting request it
sends out a cancellation for every attendee for that meeting. I've checked
mailbox and delegate permissions for the originator of the meeting and the
person declining the meeting isn't listed.

Server is Exchange 2k3, and users are mixed between Outlook between 2003 and
2007.

It started with one user, but lately I've noticed about 5 others are now
cancelling meetings when they decline.

Does anyone know of any settings in Active Directory, Outlook, or Exchange
2k3 that would be causing this?