Your sync software is to blame here. Outlook only acts as a source and/or
destination just like your Palm Pilot. Your sync software is responsible for
not creating duplicates. Contact the vendor of the sync software for
support.

Signature
Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
Outlook FAQ, HowTo, Downloads, Add-Ins and more
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> Everytime I sync my Palm Pilot Tungsten E2 with my Outlook 2003, all of my
> contacts and calendar entries get duplicated. There must be a way to stop
> this from happening. Please help!