- IMAP: Don't crash if IDLE command is pipelined after a long-running UID FETCH or UID SEARCH. - IMAP: Some FETCH command parameters were broken with in some OSes. - mbox: New mailboxes were created with UIDVALIDITY 1. - mbox: Don't write garbage to mbox if message doesn't have a body. - Maildir: Fixed using in-memory indexes when some required directory was missing. - auth: Don't assert-crash if trying to log in as master user but with empty login username. - Transaction log dotlocking ignored mail_nfs_index and dotlock_use_excl settings. - convert plugin / convert-tool: Fixed changing hierarchy separators in mailbox names when alt_hierarchy_char isn't set. - Several fixes to expire plugin / expire-tool - zlib: Give better error messages on failures.