How to open a shared calendar
To access the shared calendar, do the following:
If you use the Windows Outlook client, then it will open automatically for you though it can take a couple of hours.
Sign into your mailbox using Outlook on the web, and then select calendar.
Click on add calendar on the left-hand side.
In From directory, search for the shared calendar you want to open.
Select which folder you would like to add the calendar.
Click add.
You will now see the shared calendar on the left-hand side.