I have a client who is having a strange problemn with Outlook. They are connected via Exchange. I had to remove over 3000 duplicate calendar items. Everything seems fine for about a week, then the duplicates start creeping back in. After the 2nd week there is about 700 back. SO I user my duplicate remover program, and we are fine for another week. After running it, I can logon from a diff pc and see that the dupes are gone. Why would they come back in to exchange. No other user is having this issue. Also, sometimes if we add a recurring appt, it disappears the next day. Any suggestions are appreciated. This is on a vista pc, quadcore, 500gb hadd, 6gb ram, gigabit ethernet