You receive duplicate messages from the server each time you send and receive.

Issue : You Receive Duplicate Messages When You Download E-Mail from the Server in Outlook Express

Cause: This behavior can occur if the Pop3uidl.dbx file is damaged.

Solution: To resolve this behavior, rename the Pop3uidl.dbx file, and then restart Outlook Express. Follow these steps:

1. Click Exit on the File menu to quit Outlook Express.
2. Click Start, point to Search, and then click For Files or Folders.
3. In the Search for files or folders named box, type Pop3uidl.dbx, and then click Search Now.
4. Under Search Results, right-click the Pop3uidl.dbx file, and then click Rename.
5. Type Pop3uidl.old, and then press ENTER.
6. To start Outlook Express, click Start, point to Programs, and then click Outlook Express.