How to remove duplicate tasks in standard views of Outlook 2007?

[Dan]

I now have duplicate tasks being shown in any view. When I use the view
Outlook Data Files, it shows two Personal folders and duplicates

 

[Brian Tillman]

I now have duplicate tasks being shown in any view. When I use the
view Outlook Data Files, it shows two Personal folders and duplicates

You didn't import from another PST, did you? This is a sign of a corrupt
profile and often caused by importing from a PST. See if this helps:
http://www.outlook-tips.net/howto/ghosts.htm