Follow the steps below to add a calendar to Outlook

First, navigate to the lower left-hand corner of outlook and click on the calendar tab.

At the top of the calendar page click on the 'open calendar' tab

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From the drop down list select the 'from address book' option.

-After you select 'from address book' a pop will appear.
-In the search bar, search for the calendar you are trying to add.
-Select the calendar and press the calendar button at the bottom so that it is added to the lower box.
-You can select multiple calendars to add at one time if you have more than one to add.
-Click ok

-After you have added the calendars you will see them appear to the left.
-You can click the check box to show/hide each calendar for easy viewing