Thunderbird is a free email application that’s easy to set up and customize - and it’s loaded with great features! Download Thunderbird — English (US) Windows 64-bit. Windows MSI 64-bit. Notable CardDAV clients are Apple Contacts (OS X), iOS devices, BlackBerry devices running QNX, CardDav-Sync for Android, and Thunderbird (via the SOGo Connector). Below is a list of knowledge base articles for connecting to MDaemon via various popular CardDAV clients. Read Product Reviews. Powered by Spiceworks. CardDAV is available in TB, but it doesn't currently support Google OAuth2 authentication. I just tested with TbSync 2.19 and Provider for CalDAV & CardDAV 1.24. Adding a contact in the Google address book in TB, or adding a contact in Google Contacts, syncing works both ways after the account is synced in Tools/Synchronization Settings (TbSync). These notes apply to Thunderbird version 87 beta 3 released March 16, 2021. Windows: Windows 7 or later. Mac: macOS 10.12 or later. Linux: GTK+ 3.14 or higher. Thunderbird since version 86.0b1 is using a new implementation of the message sending code that is easier to maintain and more flexible. As with any major change, bugs are bound to happen.
I recently updated to version 78 of Thunderbird. I was using gContactSync (which is no longer compatible). I have switched to TBSync.
Now my question:
In my Thunderbird Address Book. I have my contacts in groups/folders. i.e. Family, Friends, and Business. In my Google account I have the same set up but with labels. I had to do a lot of messing about to get gContactSync to maintain the groups.
I am concerned if I turn on the sync in TBSync for the Address Book that it will trash one or both the address books in Thunderbird and in Google! Would this happen?
Thunderbird Carddav Account

Also what is the difference (in TBSync) between 'Contacts' and 'Address Book'? Contacts seems to be read only.
Thunderbird Carddav Adressbuch
Thanks.
