O/Look Express 6 – The joys!

Hi all, one of the sites users is experiencing problems with deleting items from her Inbox within Outlook Express. When she clicks the delete button, the item doesn’t move to Deleted Items. Instead, it is still viewable. It isn’t until the user closes down Outlook then goes back in that the E-Mail moves itself. The machine is running on a LAN, connects via POP3 and is running IE6 (the latest update off windowsupdate.microsoft.com) Can anyone suggest anything?