I’m surprised how long time it took for Google to get their acts together and introduce this feature. Given that Yahoo already offer this feature, Google probably felt the pressure to offer this too.
I’ve personally had a lot of issues with Gmail and their contacts management system. Perhaps my issue was rooted in the fact that I had my Mac OS Address Book configured to sync with my Gmail, but I ended up messing up my address book entirely. That said, I’m not sure if I should point the finger at Google or Apple, but perhaps this new feature in Gmail would have resolved the problem. Yet, I’m not taking any chances for now and have disabled the Address Book <-> Gmail sync entirely. (As a side-note, my problem was, in addition to regular duplicate contacts, that I ended up with a lot of duplicate contacts with only an email address — no name or any other data.)
If you want to remove your duplicate contacts, just go to your contacts section in Gmail and click ‘Find Duplicates’ as illustrated below.



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