We're having a time with recurring appointments. After editing them (ex: adding/removing an invitee) we frequently get the message "unable to to open or delete a recurring appointment" or "cannot open this item. The object could not be found". We're using Exchange 5.5 with NT 4.0. Normally, we end up having to recreate the appointment, but it's creating a real serious problem in the organization. Has anyone else run into this problem?