If you select From Address Book, or From Room List do the following:.
Select where you want to add the calendar from.
Right-click on the name of your new Calendar Group.
On the left-hand side right-click My Calendars.
Create a Calendar Group To create a calendar group, do the following: It is suggested to create your calendar groups in Outlook Online. By creating a calendar group, you can see the availability of several people at once. Calendar groups help you determine when groups of people are available.
View several people’s availability at once by creating calendar groups, formerly called group schedules.