I originally posted this at http://www.318.com/TechJournal A key aspect of any groupware solution is the ability to share calendars. Leopard server brings the long-awaited ability to share calendars to the Mac OS X Server platform. Leopard uses CalDAV as the back end protocol for Calendar sharing. CalDAV is currently supported by Facebook, Novell Evolution, Zimbra, Drupal, Microsoft Exchange, Kerio and now Mac OS X Server. CalDAV looks at each event as an HTTP resource, giving users the ability to view events in a web browser. Each event is stored in the iCalendar format. A typical event in the iCalendar format: BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Apple Calendar//Calendar1//Charles Edge BEGIN:VTODO DTSTAMP:19980130T134500Z SEQUENCE:2 UID:uid4@host1.com ORGANIZER:MAILTO:riaa@us.gov…