EPD - Office 365 - Calendar - Setting Public Permissions
How to change the permissions to limited availability to aid in meeting scheduling.
There are four permission levels that can be set to control the privacy of the calendar in Office 365. EPD recommends Availability only.
Not shared: This setting keeps the calendar completely private. Only the user can see the events and availability of their calendar. This is the default permission level.
Availability only: It is preferred that all EPD users select this setting. It allows others to view blocks of time as Free, Busy, Tentative, or Away, which greatly aids the scheduling of meetings.
Limited details: This setting allows others to view event subjects and locations. If an individual event is set to private, it will appear as "Private Appointment" to other viewers.
Full Details: This setting allows others to view event subjects, locations, attendees, and descriptions. Like the Limited details setting, individual events set to private appear as "Private Appointment."