Cyrus IMAP 2.4.17-caldav-beta10 Release Notes
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* DAV DB changes now occur in the mailbox API which means that
  replication works for calendars and addressbooks.

* IMAP XFER is now based on replication.

* Added support for free/busy query URL to CalDAV.

* Authentication for GET/HEAD requests is now done on-demand so that
  free/busy queries and/or calendar subscriptions can be done
  anonymously (subject to ACL).

* Added support for VAVAILABILITY, VPOLL, RSCALE to CalDAV based on
  current drafts (requires libical from git).

* Updated http_timezone.c to be compliant with current draft.

* Numerous other CalDAV fixes/enhancements.

Cyrus IMAP 2.4-caldav Releases