Sync Calendar with Mozilla Lightning
Lightning is a plugin for Mozilla Thunderbird e-mail client.
Select Create a new calendar on the Mozilla Thunderbird main window:
Select On the Network option:
Select CalDAV option and provide the full path to your calendar:
Note: that unlike many CalDAV and CardDAV clients Mozilla Lightning does not support discovery mechanism, you must provide a complete URL to your calendar.
On the next step provide the name of the calendar:
Enter your credentials: