Merge pull request #232 from mailcow/Braintelligence-TB-CalCardDAV

Add another way of connecting Cal/CardDAV to TB

docs/client/client-thunderbird.md

@@ -54,3 +54,28 @@ Automatic configuration of calendars and address books in Thunderbird is not cur
 <div class="client_variables_unavailable" markdown="1">
 Automatic configuration of calendars and address books (from step 9 onward) in Thunderbird is only supported if your server administrator has enabled [SOGo Connector](https://mailcow.github.io/mailcow-dockerized-docs/third_party-thunderbird).
 </div>
+
+## Different method of connecting Cal-/CardDAV in Thunderbird with automatic detection of address books and calendars
+
+Instead of using SOGo Connector you can use a combination of
+
+- https://addons.thunderbird.net/de/thunderbird/addon/tbsync/ and
+- https://addons.thunderbird.net/de/thunderbird/addon/dav-4-tbsync/
+
+1. To add your Cal-/CardDAV accounts go to `Tools` and find TbSync
+
+![TbSync](../images/thunderbird-tbsync.png)
+
+2. You can add new accounts via the CalDAV & CardDAV provider:
+
+![TbSync - CalDAV & CardDAV Provider](../images/thunderbird-tbsync-caldav.png)
+
+3. Choose "Automatic Configuration". Use your mail address as account and username. Use your mail password as DAV password. The server URL is your MAILCOW_HOSTNAME (specifying any protocol is not necessary, just enter the full domain).
+
+4. Now tick the checkbox for "Enable and synchronize this account" in the synchronization status tab:
+
+![TbSync - Enable](../images/thunderbird-tbsync-enable.png)
+
+5. Several available resources should appear in the same window area now. Tick all checkboxes of the resources (address books and calendars) that you want to sync. Choose a synchronization period (in minutes) in the same window area before clicking on "Synchronize now". If you leave the sync at "0" it will only sync manually so choose at least 30 minutes for periodic synchronization.
+
+If you want to manually synchronize you can find this option under "Account actions" - the dropdown-menu where you added the Cal-/CardDAV account (step 2).