See http://www.slipstick.com/addins/contacts.htm#dupe for tools to help with this.

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Sue Mosher, Outlook MVP
Outlook and Exchange solutions at http://www.slipstick.com
Author of
Microsoft Outlook Programming: Jumpstart
for Administrators, Power Users, and Developers
http://www.slipstick.com/books/jumpstart.htm
> Is there a way to consolidate duplicate contacts? Let's
> say I have Contact1 John Doe with an email address and
> Contact2 John Doe with phone number. Both are the same
> contact and I want to merge them. Any thougts?
> Thanks!