First, you must remove your old calendars if they are present. In Webmail, right- click on the calendar you wish to remove and select “Remove”. The calendar should no longer be visible after this.
From calendars, right-click on “My Calendars”, select “Open Calendar”.
In the “Open Calendar” dialog that appears, start typing in the name of the calendar you are adding and click on “Search contacts and directory” if your calendar doesn’t automatically appear.
Once you see your calendar, select it and click “Open”.
Your calendar will then be available. If there is no data, please see the “I added a calendar and it is empty” section.