[coob]

The other day I connected my phone to WMDC on vista after syncing with a Activesync 4.5 machine at work. WMDC said uh oh, you can do that and removed all my contacts on my phone.

Another quick way is to export contacts to a file on your desktop outlook, then delete all of them in desktop outlook. When you go to reimport them back in, outlook should ask you what you want to do with dups. If you do this, use the Windows (CSV) format.