Release Notes: Most of the code has been rewritten for this version. Compatibility with IMAP clients has improved. The code is more stable and secure. An (optional) SMTP daemon is included for high-load installations with support for SPAM filtering. The configuration is much more flexible.
Release Notes: This release fixes a major security hole and improves performance.
Release Notes: A data consistency bug in the EXPUNGE command was fixed. PAM is no longer default.
Release Notes: Fixes to prevent stale locks, and support for partial body fetches and part specifiers.
Release Notes: This release has fixes for Netscape Communicator including moving messages and storing message flags.