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Step One: With the Outlook calendar open, select the Open Shared Calendar option at the top.
Step Two: in the new window, type in the Calendar name or address. Select the calendar and click Open on the bottom right.
Step Three: The newly added calendar will appear under Shared Calendars on the bottom left hand corner.
Step Four: If you would like to remove a Shared Calendar, right click ( or Ctrl + left click) and select Remove from View.