Hi, Have run across a problem not seen before. Looking for some help. Background: Outlook 2002 SP1, Exchange server 2003 6.5.7638, Windows Server 2003 R2 SP2. Problem: duplicate mail messages in the user’s Exchange mailbox. It only happen for about 2 hours during the evening. The user had closed down the client (on a laptop) a couple of hours before. Each of the duplicates have been internet based mail from various domains. When either of the entries are selected, the other is highlighted as well. Both become marked as read. If one is deleted, the other one is gone as well. Using Outlook to search for duplicates reveals no duplicates. Any suggestions? Have thought about moving the message(s) to a PST to see if it move both entities or just one.