User A will invite UserB and UserC to a meeting. When the invite is sent, UserD (Ex Employee who was very nosy) gets invited also. (Since UserD is no longer here, an undeliverable message comes back to UserA, which is very annoying.) This happens for every invite sent by UserA and UserC - it never happens for UserB!
I am fairly certain this is something stored in the server somewhere, because since UserD has left, all of the workstations have been changed. I want to stop this activity, but dont know where in exchange to look.