1. First, you must remove your old calendars if they are present. In Outlook, right- click on the calendar you wish to remove and select “Delete Calendar”. The calendar should no longer be visible after this.
From calendars, right-click on “My Calendars”, select “Add Calendar”, then click “From Address Book”.
In the “Select Name: Global Address List” dialog that appears, type in the name of the calendar you are adding, then double-click the calendar name in the results list.
Ensure the calendar name appears in the “Calendar” field, and click “OK”
The calendar should now appear in your “My Calendars” list.