Connecting to shared calendars on ical server using the Lightning extension for Thunderbird

To access a shared resource/location calendar on a iCal server from the Lightning extension for you’ll need the GUID for the calendar you wish to access, see my previous post on how to obtain it.

Once you’ve obtained the GUID, construct a url using the following convention (assuming you’re connecting to the server via SSL)
https://yourserver.somewhere.local:8443/calendars/__uids__/your-shared-cal-guid/calendar/
Switch to Thunderbird, go to File > New > Calendar…
Select “On the Network” from the wizard & press continue
Select “CalDAV” as the format & for the location specify the URL you constructed using the convention above & press continue.
Once you’ve specify a name for the shared calendar & pressed continue you should have access to the shared calendar.