ICal

Internet Calendaring and Scheduling Core Object Specification - relevant for both sharing (Group Calendaring) and Data Synch

aka ICalendar http://en.wikipedia.org/wiki/ICalendar

http://www.ietf.org/rfc/rfc2445.txt

• 2009: replaced with http://tools.ietf.org/html/rfc5545

X Cal is the XML DTD spec related to it.

Some comparisons http://wmf.editthispage.com/discuss/msgReader$7900?mode=day to VCal

Apparently http://wmf.editthispage.com/discuss/msgReader$7904?mode=day MsOutlook (and MsEntourage) can work with ICal format.

pointers http://farm.tucows.com/blog/_archives/2004/11/2/173619.html

Oct'2011: Jon Udell on Time Zone issues.

Also Apple's Mac calendar software/service.

http://www.apple.com/ical/

There is some Group Calendaring potential, but it's not clear whether it's compatible with anything else.

http://www.apple.com/ical/share.html

http://apple.slashdot.org/apple/02/09/13/1843217.shtml?tid=177

http://www.macdevcenter.com/pub/a/mac/2002/09/20/ical_webdav.html