Rated 5 out of 5 stars

As of version 0.11, this addon is now broken in Thunderbird 52, just in case anyone is still running this old version of Thunderbird for compatibility reasons with indispensable legacy addons and is wondering why tbsync has forgotten your CalDAV / CardDAV account information and has become unresponsive. It isn't tbsync, it's this. Rolling back to version 0.10 solves the problem.

Thanks for catching this. I updated the min version setting to TB60.

Rated 5 out of 5 stars

It's a great add-on! You only need to install create a new account and synchronize the contacts and calendars.

This review is for a previous version of the add-on (0.10). 

Rated 5 out of 5 stars

In a world with a lot of "standards" this Addon saves time, stress and simply makes me happy! Thanks al lot for this great tool! I use Thunderbird together with Adressbooks/Calendars from Outlook (work) Nextcloud (privat) and als works really well!

This review is for a previous version of the add-on (0.8.29). 

Rated 5 out of 5 stars

I needed a replacement for Sogo Connector, which I used with an older fork of Thunderbird. This addon along with TBsync completely replaces the old connector, and works like a charm with Thunderbird 60. I'm able to sync my calendar and contacts.
Initially there were some problems, it did not properly cooperate with my Radicale server, but thanks to the authors helpful attitude, the issues were fixed lightning fast :)
If I could, I'd add 10 stars.

This review is for a previous version of the add-on (0.8.28).