I have an imac, ipad2, iphone and Macbook Air. Since I upgraded to icloud, my Macbook Air Address Book has been suffering from duplicate contacts. Address Books of all other devices are fine.

After alot of googling, I finally found this thread that solved the problem.
- http://www.macobserver.com/tmo/forums/viewthread/81665/

I’ve rewritten the instructions a little more clearly.

1. First of all, BACKUP you Address Book from another computer that has the correct Address Book.
2. Open the faulty Address Book.
3. On Address Book navigation, go to Preferences.
4. In Preferences, deselect “Enable this account.”
5. In Preferences, click icloud icon and delete (by clicking minus sign).
6. Open System Preferences.
7. In System Preferences, go to icloud and re-check Address Book.

Voila! Open Address Book — there should be only one copy of each contact!

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