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I enabled the iCal module that came with Calendar. The little iCal calendar icon appears underneath my mini-calendar. When I click on it, I get a pop up asking me to either open or save calendar.ics. I chose to open it with Microsoft Outlook and when I did, the calendar is empty even though I have a bunch of events on the calendar on my website. How does iCal work? Do I have to do more than enable the module?