1. Open the Outlook - either the desktop app or in a web browser.
2. Click on the "Calendar" icon located at the upper left corner of the screen.
3. Click on the "Add calendar" button.
4. Select "Add from directory".
5. Select account from drop-down menu. This will the account you are adding the shared calendar to, typically your own email account
6. Type the name of the calendar you want to add in the search bar.
7. Select the calendar from the search results.
8. From the drop-down, select where among your calendar groups you want to add the calendar.
9. Click on the "Add" button.