Cyrus IMAP 2.4.11 Release Notes
Changes to the Cyrus IMAP Server since 2.4.10
fixed replication recovery from different messages at the each end
Bug #3489 - fixed quotalegacy handling of prefixes so only exact subfolders match
Bug #3498 - fixed deletion of users quota files with unixheriarchysep enabled, thanks Leena Heino
Bug #3491 - NOOP and UNAUTHENTICATE for timsieved, thanks Dilyan Palauzov
Bug #3492 - better response codes for timsieved, thanks Dilyan Palauzov
Bug #3497 - fix cmd syslog from master, thanks Kristof Katus
Bug #3503 - compilation of perl libraries on dragonfly and freebsd, thanks OBATA Akio
Bug #3451 - allow CC to have spaces
Bug #3505 - fix sync_reset, thanks David Carter
Bug #3506 - use literal+ for sync_(client|server), thanks David Carter
Bug #3300 - use portable function for TCP constants, thanks OBATA Akio
Bug #3507 - fix replication recovery with non-delayed expunge, thanks Julien Coloos
Bug #3495 - improved duplicate suppression, thanks Kristof Katus
Bug #2772/3463 - fixed crashes in THREAD by correcting folding of references headers
Bug #3439 - fix ugly syslog message for vacation
Bug #3499 - options to disable namespaces to reduce load on big servers with no shared folders. Thanks Olivier ROLAND
Changed skiplist to truncate old files after checkpoint, which can save disk space on tmpfs or small ssds when old copies were held open by other processes
Made Cyrus more robust against corruption in mailboxes.db data, so it will return an error rather than crashing on invalid entries
Fix for CVE-2011-3208, a remotely exploitable buffer overflow in nntpd - thanks Coverity