Trying to integrate Zimbra calendars in Lightning, I ran into a couple of problems. So far I’ve found four different ways to do it in the internet: ICS: http://zimbrahost.example.com/home/USERNAME/CALENDARNAME ICS: webcal://zimbrahost.example.com/home/USERNAME/CALENDARNAME ICS: webcal://<USERNAME>:<PASSWORD>@zimbrahost.example.com/home/USERNAME/CALENDARNAME CalDAV: http://zimbrahost.example.com/dav/USERNAME/CALENDARNAME Now the ICS solutions don’t work properly for me, the calendar entries are loaded but Lightning is unable to write…