Hello List, I've had troubles upgrading from 1.4.6 to 2.0.3 as well : duplicates all over the place, not only in Contacts but in mailboxes as well. I went to IRC for help and was directed to this message : http://lists.ximian.com/archives/public/evolution/2004-September/039343.html (thank you guenther!)
If you still have your 1.4.x data (you DO have a backup right ?), check the part that deals with manually forcing migration. This worked flawlessly for me, and I hope this can be of any help to other people as well. Cheers, Romain Riviere
