> since I started having more than one writable calendar in Lightning, all
> event invitations from all mail accounts will always go to one calendar.
> Regardless that each calendar has it own mail account/address configured.
> Deleting or deactivating the one calendar which got all events will now
> hide all the accept/decline-Buttons in event invitation mails, even if
> there is a writable calendar having this mailaccount configured.

> So I started debugging in the source code and found out, that in
> file modules/calItipUtils.jsm the function isSchedulingCalendar() yields
> false for the calendar where I say it should say true. Reason is that
> calendar.getProperty("organizerId") returns null for it. Debugging
> further shows up that the getProperty-Function
> (modules/calProviderUtils.jsm@768) is not called. When I now activate
> (or even add when I deleted it before) the calendar, which eats up all
> event invitations, then I notice that the getProperty("organizerId")
> function IS called.

> Thats the current point I am at. Is there someone out there who could
> give me a hint what could have triggered that behaviour?