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CloseReview for Google Contacts by Jay
Rated 4 out of 5 stars
Excellent Sync - even Postal addresses!
Syncs almost all Contact fields between Gmail and Thunderbird.
Add-ons options allows Postal Address conversion from Gmail free-form to Thunderbird fields addresses - Suggest set "use line breaks" and ensure all postal addresses are of same format.
On downside - Thunderbird expects Firstname and Lastname to be populated - to form main "Name" entry - Add-on populates Display Name only. - will be 5 stars when this is fixed!
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