Outlook Desktop Application
(Scroll down for Outlook Web)
Right-click on "My Calendars" in the left panel. Select "Add Calendar" and then "Open Shared Calendar."
Type in the first part of the name of the calendar you wish to import and select OK.
Then select the calendar from the resulting list.
Login to your account at www.office.com
Select the calendar icon at the bottom of the navigation panel to go to your calendar
Select "Import Calendar" from the left panel.
Select "From Directory"
Begin typing the name of your calendar as provided by your school. Then select the name of your calendar.
Select My Calendars.
Your new calendar will now appear in your calendar list.