Comment 14 for bug 810622

I have a similar problem, and it has nothing to do with google.

Thunderbird 7.0.1 with Lightning 1.0b7 on Win7 x32, CalDAV or iCal calendar on Zimbra 6.0.6.

Steps to reproduce *my* problem:
1. Create a (second) local calendar in lightning
2a. Create a CalDAV calendar in lightning using http://my.server.tld/dav/USER/CalendarName OR
2b. Create an iCal calendar in lightning using http://my.server.tld/home/USER/CalendarName
3. Let an Outlook user send you an invite

Actual results with iCal calendar (2b):
In both the preview window and when I open the mail as new window or tab, it is formatted like lightning formats invitation mails, with a blue bar on top saying "this mail contains a calendar event", but without the buttons for accepting/declining. I cannot do anything with this invitation except view it in the mail. I could also drag its attachment (*.ics) to the calendar/tasks pane; this will create a "new calendar event" dialog, pre-filled with the actual event data, but this of couse won't let the organizer know that I want to accept/decline.

Actual results with CalDAV calendar (2a):
This time, the accept/decline buttons appear in the blue list, but when I click accept, I get a dialog saying "select calendar". Unfortunately, this dialog ONLY LISTS MY TWO LOCAL CALENDARS, which doesn't help me because I need it in the remote calendar. Again, I could always drag the .ics attachment to the sidebar, creating a new event, making myself the organizer.

Expected results with both iCal and CalDAV:
I click accept, a dialog lets me select any of my (non-readonly) calendars, including CalDAV and iCal ones, asking me whether I want to send a notification mail, event is then added to the chosen calendar.