I wonder what open source group calendaring solution people are using that works with Apple devices and Linux.
ATM we use Apple's CalendarServer but this one seems to have trouble with the existing Linux clients (Evolution, Thunderbird/Lightning). Also, invites do not really work, and sometimes appointments appear on calendars of persons that were never invited.
I just can't believe that everybody is using Exchange nowadays. There has to be someone who has a working CalDAV solution with around one hundred users.
What do you use?