# Cyrus IMAP 2.4.17-caldav-beta10 Release Notes

- 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