I've recently installed Lightning 4.0.4.1 with Thunderbird 38.4.0 on Ubuntu 15.10. I want to publish my calendar to a WebDAV server. The WebDAV server is Linux Slackware 14.0 with Apache 2.4.16.

I have published my calendar: right-click on calendar > Publish Calendar, then enter the URL and click 'Publish'. The "Publish Calendar" dialog stayed up forever (I actually went away for a few hours and it was still there when I cam back), but it did appear to correctly publish the calendar to the server.

First problem: Later, I updated my calendar with a new event, but it has never update the .ics file on the server. Why?

More question: with Outlook, I could specify a date range of events to publish, detail level (Availability only, Limited Details, Full Details), and configure update-to-server frequency. Are any of these settings available with Lightning? If not, what are the defaults?

How do I invite people to share my calendar? I can find no "share" option.

Where is my calendar physically stored?

More info ... for subscribing to a published calendar with Thunderbird/Lightning there is apparently no "invite" action. You just do:

1. Calendar Tab
2. File > New > Calendar
3. select "On the network"
4. select 'iCalendar (ICS)' (default)
5. enter location, e.g.: https://mydom.com/calendars/Office_Calendar.ics

For Outlook, you need to paste the URL webcals://mydom.com/calendars/Office_Calendar.ics into I.E. and it runs some wizard to add the calendar to Outlook. I just tried this and it works.

Someone correct me if I'm wrong. Otherwise, that's one question down.

Now, why won't my published calendar update itself on the server?