Outlook 2000

I have a user who’s email doesn’t show up in the Sent Items folder after she sends it. I’ve tested it myself, sending myself a test message. I receive the mail and can reply back but it doesn’t display in the Sent Items folder. It just stopped working for anything sent after Aug 1. I’ve checked the virus definition dates and it’s getting the latest ones from the server (8/1/2003 rev21).

Any ideas?