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Kerio MailServer supports CalDAV which is an extension for the WebDAV interface designed for exchange of calendar data. For details on this protocol, see http://www.caldav.org/. CalDAV standard is defined in RFC 4791.
CalDAV is an HTTP-based protocol. Therefore, the HTTP(S) service is required in Kerio MailServer for its support.
The protocol can be used for synchronization of calendars, scheduling of meetings with assistance of the Free/Busy server and delegating of calendars to other Kerio MailServer users.