Can you right click on the root of one of the duplicates and choose "Close"?
If that doesn't work, see if the advice here helps:
http://www.outlook-tips.net/howto/ghosts.htm

"Simon Willcox" wrote in message
...
Hi, I hope someone can help me. I run Outlook 2003 connected to an
exchange server over RAS/VPN. When I open my client I can see my personal
folder & my server folder. All mail is automatically downloaded in to my
personal folder. Yesterday I got a message telling me some outlook files
were corrupt so i ran chkdsk and rebooted to fix the errors. Now when I
open the client I have personal, Server and personal again. The last is
identical to the first and they are both from the same file,
E:\work\Mail\swillcox.pst. I have tried renaming and creating a new one,
get the same problem. Has anyone else experienced this and what have you
done to overcome it?