Since the upgrade to Kerio Connect 8.1.X, it seems to be not possible to create an event in a public calendar and send out invitations for that event with CalDAV-Clients or via Webmail.
We tried this on different platforms with different clients, if we create such an event with Apple Calendar or Thunderbird, we get in both cases an error 403 with some kind of Access Denied message.
With version 7.X this was not a problem with either CalDAV-Clients nor Outlook via KOFF or Webmail.
It is even possible with Kerio Connect 8.2.1 to send invitations for an event in a public calender when u use the lagacy webmail or Outlook 2010 with KOFF.
So why ist it not possible to send invitations with the current Webmail or via Caldav from Thunderbird or Apple Calendar?
- Pavel Dobry (Kerio)
Shared and public calendars in CalDAV are presented as "shared" calendars according to CalDAV specification. As such, they are not intended for maintaining meeting invitations but only plain events. For sending an invitation the meeting has to be placed in user's calendar or in delegated calendar of other user.
Public calendar cannot be an organizer of the meeting because it cannot process the responses from meeting attendees.
So the answer is that CalDAV clients are not designed to have meeting invitations in shared calendars.
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