02 April 2006 20:30
RFC 2446: iCalendar Transport-Independent Interoperability Protocol (iTIP) - Scheduling Events, BusyTime, To-dos and Journal Entries - S. Silverberg, Microsoft - S. Mansour, Netscape - F. Dawson, Lotus - R. Hopson, ON Technologies - November 1998
"This document specifies an Internet protocol based on the iCalendar object specification that provides scheduling interoperability between different calendar systems".
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