RFC 5546, iCalendar Transport-Independent Interoperability Protocol (iTIP), has been published by the IETF as a Proposed Standard. This is the revision to RFC 2446 (iTIP) which has been underway for some time. RFC 5546 obsoletes RFC 2446. See http://tools.ietf.org/html/rfc5546. CalConnect congratulates everyone who was involved in progressing this work.