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The Cyrus IMAP server has CalDAV, CardDAV, and WebDAV modules.[1] [1] https://www.cyrusimap.org/imap/download/installation/manage-dav.html https://www.cyrusima

• chrismorgan 5y ago
  And JMAP, which makes an excellent foundation for client development, web and otherwise. Cyrus implements the calendaring and contacts drafts, counterparts to CalDAV and CardDAV. (See https://datatracker.ietf.org/doc/active/#jmap https://datatracker.ietf.org/doc/active/#jmap for the active drafts. JMAP working group minutes from IETF-111 last month say of jmap-calendars, “hopefully finalise by end of the year” <https://tools.ietf.org/wg/jmap/minutes https://tools.ietf.org/wg/jmap/minutes>. JSCalendar, which it also depends on, was published last month as RFC 8984.) Fastmail’s web app—mail, calendar, contacts and everything else—is built on JMAP, though it doesn’t yet support offline synchronisation which JMAP is well designed to support. (Fundamentally, JMAP is an object synchronisation protocol, not an email protocol or anything like that.)
  • hammyhavoc 5y ago
    Is there anything better than Fastmail currently in the JMAP space?