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"Apple's iCal Leopard page reveals that the upcoming Leopard version of iCal will support a subset of CalDAV, the distributed authoring and versioning calendar protocol. CalDAV allows collaborative creation and maintenance of shared calendars and events. With the new iCal, you won't have to send around a memo saying \"give me your open dates in November\". Instead, you can use iCal's \"Auto Pick\" capabilities to select a meeting time when everyone is free using their shared CalDAV calendars. (And, if your office uses an iCal room reservation system, you can even pick the room and block out the time you need it.) Of course, this new technology only works if everyone in the office--including that Jim-guy in the corner office who still refuses to switch from Windows--is in on the calendaring system."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2007/06/15/leopard-watch-ical-with-caldav/>