Efforts to improve Interoperability
[12] IETF CALSIFY, Charter for IETF iCalendar Simplification Working Group.
http://www.ietf.org/html.charters/calsify-charter.html.[13] CalConnect CC 0606:2006, CalConnect. Timezone Registry and Service Recommendations. First edition. 2006. CalConnect.[14] CalConnect CC/R 0602:2006, CalConnect. iCalendar Timezone Problems and Recommendations. First edition. 2006. CalConnect.[15] CalConnect CC/R 0604:2006, CalConnect. iCalendar Recurrence Problems and Recommendations. First edition. 2006. CalConnect.