If you use both the email client Mozilla Thunderbird and Google Mail (Gmail) you may need a way to keep both address books in sync so that they can be accessed from both software programs. It's unfortunately not that easy to synchronize the address books with the default options at hand.
The Thunderbird add-on gContactSync tries to make it easier by providing an uncomplicated way to synchronize the contact data. You have to enter your gmail login credentials details into Thunderbird after installing the add-on and make some configuration changes, for example the interval of the synchronization.
Some of you may not like the idea of using your credentials for this, but it is unfortunately the only option in this case.
Thunderbird unfortunately saves contact information in a format that is different from Gmail's format whcih means that you need to make adjustments to avoid issues in this regard.
By default, each informational bit about the address, like street and zip code are sorted into different lines in Thunderbird. This means that users have to change those information in Gmail to fit the layout in Thunderbird.
That's a bit problematic especially if a lot contacts with address information have been added to Gmail. The process is explained in this flash tutorial. Once that has been done the Google contacts can be imported into Thunderbird and the Thunderbird contacts can be synced with Google Mail by dropping them in the new address book that gets created in the process.
As far as options go that the extension makes available, there are plenty.
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