Try one of these: http://www.slipstick.com/addins/contacts.htm#dupes

Signature
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Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. Due to
the (insert latest virus name here) virus, all mail sent to my personal
account will be deleted without reading.
After furious head scratching, Simon asked:
| I have just reinstalled information from a repaired PDA and synched
| into Outlook on the desktop. The problem is that all the appointments
| have duplicated! How do I resolve conflicting appointments without
| deleting each one?