Most users that I know have several email accounts at various email providers. I’m using about ten email accounts actively in Thunderbird and web interfaces and always thought that there must be a way to sync the contact information. Late last night I discovered the Zindus (via Download Squad) Thunderbird extension which syncs the Gmail (and Google Reader, Google Calendar) contacts with the Thunderbird address book.
The Thunderbird add-on can be installed as usual by downloading the file to the computer and installing it from the Tools > Add-ons menu in Thunderbird. Before it can be used it has to be configured. It actually provides two different possibilities to sync the contacts. Both, Google and Zimbra, require a server address, username and password to function properly. I cannot really say much about Zimbra because I’ve never heard about it before. It seems to be a service that gives access to several mail accounts in one interface.
After adding the required information a test connection can be used to see if the connection to the server is successful. By default auto sync is enabled which means that the contacts will automatically be synced.

Please note that syncing means that both the Gmail account as well as the Thunderbird address book will contain the same contacts in the end. Auto Sync is trigged by two parameters that can be configured in the Thunderbird config (Tools > Options > Advanced > Config Editor), they are:
- extensions.zindus.system.as_timer_delay_on_start – the number of seconds after startup
- extensions.zindus.system.as_timer_delay_on_repeat – the number of seconds after the first auto-sync
The following information are synced between Gmail and Thunderbird:
- Full Name
- Primary Email address and Second Email address
- Phone Numbers: Home, Work, Work Fax, Pager, Mobile
- Instant Messaging (AIM)
- Company and Title
- Notes
Zindus is compatible to the latest official version of Thunderbird and Thunderbird 3 alpha.
Related posts:
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13 Responses to “Sync Gmail Contacts with Thunderbird”
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[...] Zindus es una extensión para Thunderbird que te permite sincronizar la libreta de direcciones de este cliente con la de una cuenta de GMail o de Zimbra. Visto en gHacks. [...]
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[...] Sync Gmail Contacts with Thunderbird [...]


I tried, and Zindus keeps saying I have duplicates that don’t match at Google with Thunderbird. The ODD THING IS, I deleted all contacts at Google.
Zindus is buggy!
Zimbra is an open source messaging and collaboration software platform (like Microsoft Exchange) from Yahoo!
I would rather use GMX email service. It’s a free beta email service that allows you to have up to 10 different email addresses on one account. It also has a mail collector that allows you to import your mail from other services such as gmail and AOL. It interfaces with Thunderbird too. Like other services, it also has file storage.
First it told me I can’t have duplicates in gmail, which is frustrating, there should be an option to overlook those contacts and just sync the rest of them. Nevertheless, once I deleted them it worked well.
In my opinion, there should also be options for one-way syncs.
But so start far so good, useful add-on!
Worked GREAT for me! Just make sure one of your two address books is completely deleted before attempting.
Wow, that works GREAT! Thanks so much. I’ll be posting about this in my blog.
Dangerous! Deleted all my contacts from Gmail!
Doesn’t sync addresses very well. Not very useful if you want this feature.
ROCK ON! This is the gmail answer I have been looking for. Thanks Martin! =)
For some reason it’s only syncing the email user part of an email address and not the full name to the name field in Thunderbird…. most unhelpful.
It works perfect …. thanks