Kerio Tech Version 6.5.2 - Manual (Page 359)

11.5 CalDAV support
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Apple iCal distinguishes between the following access rights levels:
• for reading only,
• full rights (administration).
As suggested above, delegated calendars with write rights will be understood by Apple iCal as
calendars with full rights access. However, users with these rights is not allowed to remove
the calendar.
For these reasons it is recommended to set either read or full access rights to your calendars
in Kerio WebMail.
Warning: Access rights apply to the entire account of the delegating user. If any user delegates
more than one calendar, the lowest access level is set for all these calendars. This implies that
if there is at least one calendar delegated with read rights, all delegated calendars will be
available for reading only.