In Outlook 2007, go to the Tools menu and click on Account Settings.
Click on New from the Internet Calendar and enter the full URL (listed above) for the desired schedule.
Type the name of the calendar as you want it to appear in Outlook in the Folder Name field and click OK. The calendar will be listed under Other Calendars with the name you chose (it does not merge with My Calendar)
Click the down arrow to the right of Other Calendars located at the bottom of the menu on the left and select Add by URL.
Copy and paste the full URL (listed above) for the desired schedule into the pop up window. The new calendar will now appear and is accessible from the My Calendars menu located on the left hand side of the screen.