Outlook - Shared Calendars
This article details how to view a Shared Calendar that you have access to.
Windows - Outlook app
In the Outlook application, click on the Calendar tab at the bottom left
At the top of the app, click the Home button
Click Add Calendar
Click Open Shared Calendar
Type in the email address of the owner of the Calendar
You will now see the calendar appear in the left column underneath Shared Calendars