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CAS integration can be achieved through the CasifiedCalendarAdapter.
Banner integration
Yale currently produces an iCal feed of student course schedules from bannerweb, protected with the PL/SQL CAS client. This feed is then included in the calendar portlet using the CasifiedCalendarAdapter. A description of how one might produce iCal feeds in bannerweb and protect them with Proxy CAS will be added to this space in the near future.
Microsoft Exchange
Yale is planning to design a Microsoft Exchange calendar adapter sometime in the first half of 2008.