Hi, Has anybody seen the problem in Exchange 2000 SP3 & Post SP3 Rollup (Outlook XP) where group calendar items disappear from some users but not all users. It is not the same users each time. It is random. The group can be 20 people or it can be 3. Usually it is not the sender of the appointment but 1 or more of the recipients. This does not happen all the time. There is no trace of the deleted appointment. Any thoughts would be appreciated. Goran