“When choosing group calendaring and scheduling software, many
organizations adopt one of the well-established commercial packages
like Microsoft Exchange and Outlook, Lotus Notes, or Novell
GroupWise. Their perceived simplicity is appealing: you don’t have
to think about file formats or write configuration files for server
software. However, by choosing an application that is built to
comply with Internet standards, you can eliminate the risk of being
locked into a client whose features don’t meet your organization’s
needs, while maximizing the flexibility and interoperability of
your calendaring software.“The Internet Mail Consortium is responsible for the established
calendaring and scheduling Internet standards, including iCalendar
(RFC2445), iTIP (RFC2446), and iMIP (RFC2447)…”