Calendar has been built on the technology of Zimbra, which was acquired by Yahoo!, using the
iCalendar (iCal) and CalDAV standards.
You can text your friends about that season finale of Lost, or put the premiere date of Ugly Betty on your
iCalendar. Oh, and it makes phone calls too.
HTML, hCard (based on the vCard format), and hCalendar (based on the
iCalendar format for events)--few standards are more well-known.
It's compatible with existing messaging systems (Out look, Mobile, IMAP,, POP,
iCalendar, RSS, etc.), and its consolidation feature means substantial reduction in managed storage.
Ximian Evolution also supports key data exchange and communications standards, such as IMAP, POP, SMTP, LDAP and
iCalendar, and features QuickSearch, vFolders, threaded e-mail view, in-line text editing and synchronization with Palm* handhelds.
Users of the mobile data service can now utilise the
iCalendar feature to access and manage their calendars from their mobile phone.