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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.

:ref:`imap-release-notes-2.4-dav`
