I have just spent far to much time trying to figure this out.. But I think the best approach may be to file a bug.

As I can reproduce this I have files bug 1237571

I encourage you to create a Bugzilla account if you do not already have one and add yourself to the cc list in the bug.

Actually, I did figure it out. The calendar was already published from Outlook. The trick was to subscribe to it. The procedure is not intuitive, but here's what you do, in Thunderbird:

1. Calendar Tab 2. File > New > Calendar 3. Select 'On the network' 4. Select 'iCalendar (ICS)' (default), and enter location, e.g.: https://mydom.com/calendars/Office_Calendar.ics (this has to be the actual name of the calendar on the WebDAV server.

That worked. I had the calendar owner add an event and a hour or so later (Outlook's default refresh rate) it popped up on my Lightning!

To set up the whole thing from scratch (WebDAV server), here's a link: http://noodlecode.net/2010/02/thunderbird-calendar-webdav, but I didn't need to set the server up -- already had that.

Give that a shot!

Now the question is how to PUBLISH my calendar! I'll probably post a question on that soon if my experiments fail. (Note, I did publish, but it never updates on the server with new events)

Just changing the webdav:\\ to HTTP:\\ will always work, as the prior is just a method o allow automation of the linking to a calendar application. That is why I filed the bug, Thunderbird should do that, it used to.

Personally I dislike using ics as they are read only. caldav is read write.

Since deep-sixing Exchange about a year ago our office has been living with WebDAV calendars which, yes, are read-only to the subscribers. The publisher, however, can update his/her own calendar and Outlook will update the server, and client-Outlooks will refresh the subscriber's copy. Not great, but without Exchange that's all Outlook has to offer.

I'm trying to move the office to Ubuntu and Thunderbird/Lightning but I have a problem. Even though Lightning let's me publish WebDAV calendars (as described above) it does not refresh future updates to the server, so no one sees anything other that what I initially published. Nevertheless, Lightning will update calendars published by others to which I've subscribed. Not being able to have *my* published calendars updated to the server when I make changes is a real problem. It means I cannot introduce Ubutnu/Thunderbird workstations gradually. I'd have to convert EVERYONE from WIN7/Outlook to Ubuntu so CalDAV could be used since a) Outlook does not support CalDAV and b) Lightning apparently only supports WebDAV as a subscriber. I've posted a message on this: https://support.mozilla.org/en-US/questions/1103384.

THIS, I think, *is* a bug. Getting subscribed updates to others' calendars is great, but what's up with not updating one's own published calendar on the server when one makes a change? If Lightning knows how to publish, it should know how to re-publish "on-change". Seems like a simple fix -- and an easy way to facility Outlook converts. I'll likely follow your advice and post a bugzilla!