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# 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