See http://www.slipstick.com/addins/mail_duplicates.asp - some are free.

The best way to insure no dupes is to remove mail from the server.
Otherwise, anytime you make a new profile you will download everything
again.

--
Diane Poremsky [MVP - Outlook]
Need Help with Common Tasks? http://www.outlook-tips.net/beginner/
Outlook 2007: http://www.slipstick.com/outlook/ol2007/

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"Ganz Doof" wrote in message
...
Hi - I am using OL2007 on a Win Vista platform and it seems my Outlook
Inbox has a whole bunch of duplicate messages collected over time. Is
there a Free or Open Source tool to remove this dupes automatically? What
about some took to ensure that OL does not download the same message
twice?