In this guide we will explain how to sync NextCloud calendar and contacts with your Thunderbird (this guide is valid for Thunderbird on Linux, macOS and Windows)

Synchronizing NextCloud with Thunderbird

Thunderbird is a feature-rich and mature mail client that can be turned into a full-fledged Personal Information Manager (PIM). Since version 102, it supports address book synchronization via CardDAV and automatic discovery of calendars and address books available on the server.

Alternative: Using the TbSync addon

For this method, you need to have two add-ons installed:

  1. TbSync.
  2. TbSync provider for CalDAV and CardDAV.

When they are installed, go to Extras/Synchronisation settings (TbSync) if you are on Windows, or Edit/Synchronisation settings (TbSync) if on Linux, then:

  • In the account manager choose “Add account / CalDAV / CardDAV account
  • In the next window, go with the default called Automatic configuration and click next
  • Enter an account name (which you can freely choose), a user name, a password, the URL of your server, and click next
  • In the next window, TbSync should have auto-discovered the CalDAV and CardDAV addresses. When it has, click Finish
  • Check the Enable and synchronize this account box. TbSync will now discover all address books and calendars your account has access to on the server
  • Check the box next to each calendar and address book you want to have synchronized, set how often you want them to be synchronized, and push the button synchronize now
  • After the first successful synchronization is complete, you can close the window.

Henceforth, TbSync will do the work for you. You are done with the basic configuration and can skip the next sections unless you need a more advanced address book.

Alternative: Using the CardBook add-on (Contacts only)

CardBook is an advanced alternative to Thunderbird’s address book, which supports CardDAV. You can have TbSync and CardBook installed in parallel.

  1. Click the CardBook icon in the upper right corner of Thunderbird:../../_images/cardbook_icon.png
  2. In CardBook:
    • Go to Address book > New Address book Remote > Next
    • Select CardDAV, fill in the address of your Nextcloud server, your user name and password


  3. Click on “Validate”, click Next, then choose the name of the address book and click Next again:../../_images/addressbook_name.png
  4. When you are finished, CardBook synchronizes your address books. You can always trigger a synchroniZation manually by clicking “Synchronize” in the top left corner of CardBook:../../_images/synchronize_cardbook.png

The old method: Manually subscribing to calendars

This method is only needed if you don’t want to install TBSync.

  1. Go to your Nextcloud Calendar and click on the 3 dots menu for the calendar that you want to synchronize which will display an URL that looks something like this:
  2. Go to the calendar view in Thunderbird and right-click in the calendar menu to the left (where the names of the calendars are) to add a New Calendar.
  3. Choose On the Network:../../_images/new_calendar.png
  4. Choose CalDAV and fill in the missing information:
  5. ../../_images/CalDAV_calendar.png