Rated 3 out of 5 stars

Worked great until approx May 2021. Then I presume Google moved the goalposts and now all I get is:
gContactSync Refresh Token
Authorisation Error
Error 401: disabled_client
Sign in with Google temporarily disabled for this app. This app has not been verified yet by Google in order to use Google Sign In.

I believe the developer needs to register the app with Google, but as he has not done so (despite my writing to request it some while ago) I am left up a creek with no paddle. Perhaps he has become discouraged with all the mindless changes Google and Thunderbird keep throwing at him -- I wouldn't blame him. All the other sync add-ons have fallen by the wayside too. But with no way of syncing my PC, laptop and phone any more, disaster and chaos looms. Mailspring doesn't seem to do a good job with contacts, eM Client syncs but you can't enter an address in UK format. I tried syncing via Outlook.com but that has become complicated and the phone doesn't sync changes... Huge despair here. Been going on for months and my address book is in deep doo doo.

Rated 1 out of 5 stars

Flat out doesn't sync. Sad.

Rated 3 out of 5 stars

Este excelente AddOn ( gcontactsync) foi o meu principal motivo por usar e gostar do Thunderbird por muito anos! Fico decepcionado por não ter mais atualizações e também nenhum outro desenvolvedor para dar continuidade a esse importante projeto! Infelizmente terei que abandonar o TB!

Rated 5 out of 5 stars

gcontactsync add on was the reason i used TB..pitty it hasn't been updated to 78. While I thank Josh for making this add on available...i do hope he gets the time to update it in the future..stay safe Josh..waiting for your update.

This user has a previous review of this add-on.

Rated 1 out of 5 stars

An addon on the feature that Tbird critically lacks now is killed by Tbird.

Tbird follows Fx faggot way: SJW above quality.

RIP Tbird. You was a great client...

This user has a previous review of this add-on.

Rated 4 out of 5 stars

I am the author of Google-4-TbSync, but I agree with Stephen J. Cowley to thank Josh Greenen for his useful work over the years: gContactSync did a superb job until TB 68.

Rated 5 out of 5 stars

gContactSync has been a great Add-on for TB <= 68; thanks to Josh Geenen for all his work. For TB >= 78 I have started using Google-4-TbSync. This Add-on is under development, but it seems to work, and when I reported a bug to the developer he fixed it in a couple of days.

Rated 3 out of 5 stars

Serait bien, s'il fonctionnait avec TB 78...
Please! une version fonctionnelle!

Rated 3 out of 5 stars

Super programme, mais ne fonctionne plus avec les dernières versions de Thundebird .... Dommage

Rated 5 out of 5 stars

Componente fondamentale con un account GMAIL. Non aggiornerò THUNDERBIR fino a quando non uscirà una versione compatibile

Rated 5 out of 5 stars

Without this addon, Thunderbird is useless for someone with a GMail Account!

Mozilla (or whatever organisation manages Thunderbird these days) should hire/pay that add-on developper and make this add-on standard, just like they did for Lightning.

Also, they should stop breaking their API, because everytime they do that, they just shrink the amount of add-ons that can be used, and therefore agressively diminish Thunderbird's attractiveness. Version 78 was the nail in the coffin. I have been using it since the mid-2000. Now I switched to another email client. Thunderbird you killed this add-on... and committed suicide!

Rated 5 out of 5 stars

Sans carnet d'adresse, Thunderbird est beaucoup moins attrayant.
Tout le monde sait ce que représente le transfert de carnet d'adresses: pertes et dégâts en perspectives!
gContactSync permet de travailler très efficacement.
Un upgrade vers la version78 de Thunderbird est souhaitée...
A moins que vous ayez d'autres propositions compatibles avec Thunderbird pour l'hébergement d'un carnet d'adresses en ligne.:-)

Rated 5 out of 5 stars

Gcontactsync is so essential to me that I will NEVER update to a Thunderbird version that doesn't support it. Its author deserves praise and payment! And if he doesn't feel like continuing to update, then Thunderbird should stop breaking the addon with their updates! Gcontactsync ROCKS!

Rated 5 out of 5 stars

Hi this extension has saved my life until now! Simply great!
But PLEASE PLEASE PLEASE release an update for TB 78.
If you relase it as permanent license I'll pay for it for sure!

Rated 5 out of 5 stars

Ein tolles Add-on! Benutze sie seit Jahren. Würde mich sehr freuen, wenn es auf Thunderbird 78.7.1 funktionieren würde! Vielen Dank für die tolle Arbeit!

Rated 1 out of 5 stars

Doesn't work with Tbird 78

Question to IGG that posted the comment below:
What best alternative to TBird did you find?

This user has 2 previous reviews of this add-on.

Rated 1 out of 5 stars

Funktioniert seit einiger Zeit nicht mehr und wird nicht aktualisiert.

Rated 5 out of 5 stars

It is a great complement for Thunderbird and it is urgent to get the update for the newest Thunderbird version. Please!!!!!

Rated 4 out of 5 stars

Great add-on, I've used it for years without a flaw!
Can you please update so it'll work with TB 78 release, thanks!

Rated 1 out of 5 stars

Does not work with Thunderbird 78!
Can we please have this updated, or source available for someone to make it compatible with the latest Thunderbird.

There are no other ways to sync Google contacts automatically with Thunderbird, it is a feature I need, so I am having to use another email client!