User1 is using Outlook 2003. When any user tries to send user1 a meeting request, user1 receives it, BUT any user sending the meeting request gets a message back (delivery failure) saying that ANOTHER user's address isn't recognized. Now, this unrecognized user address is a user whos account was disabled and her mailbox removed. This user once had permissions to User1's calendar. I removed this user from all of User1's folders and removed her from all groups. Why is "any user" getting a delivery failure message, even though a request isn't even being sent to this disabled account?