Cyrus IMAP 2.4.17-caldav-beta11 Release Notes
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2.4.17-caldav-beta11

* Properly do time range filtering on a recurring event where the
  recurring component isn't the first component in the iCalendar
  stream.

* Properly do time range filtering on an uncompleted task with no due
  time.

* Added short-circuits to calculation of recurring event time span.

* Faster free/busy calculation for non-recurring events.

* Added caldav_mindatetime and caldav_maxdatetime options.

Cyrus IMAP 2.4-caldav Releases