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CalDAV Application: Thunderbird

    1. Install the Lighning Addon

    In order to use calendar functionality in Thunderbird, you need to install the Lightning add on. Go to Add-ons in the menu, search for Lightning and install it.

    2. Add a calendar

    Right click on the calendar sidebar and select New Calendar.

    3. Select calendar type

    On the first page of the New Calendar wizard select On the Network and click Next.

    4. Type the calendar location

    Set Format to CalDAV and in the Location field type the Alternate URL that you can find in the connection details of your Roundcube calendar. (Make sure to use the Alternate URL, not the URL.) Click Next.

    5. Type the calendar location

    Type the name of the calendar as you want it to appear in the calendar list on the sidebar. Click Next.

    6. Authenticate

    Type the username that you got when creating the CalDAV connection in Roundcube and the password that you chose. Click OK.

    7. Done

    You should now see your Roundcube calendar in the calendar list on the sidebar and its events in the calendar grid.