Release Notes: This release offers new features, enhancements and bugfixes. Please read the release notes before upgrading from an earlier version. New features include full support for shared mailboxes and IMAP ACL extension and support for several other IMAP extensions. New plugins: Virtual mailboxes, Autocreate, and Listescape.
Release Notes: This new major version includes various major enhancements, bugfixes, and security fixes.