Control Calendar Sharing
Supported on: At least Windows Server 2008 R2 or Windows 7
Registry
HKCU
software\policies\microsoft\office\16.0\outlook\options\calendar Options
payloadcalendardetailspolicy enum - Prevent Calendar Sharing
->
32768 - Allow calendar sharing with 'Availability Only' detail level
->
16384 - Allow calendar sharing with 'Availability Only' and 'Limited Details' detail level
->
8192
Description
By default, users can share an entire calendar by saving it in the iCalendar format, or share a snapshot of a calendar by using e-mail. This setting allows you to specify the detail level in the shared versions of calendars, or to disable sharing of calendars.