Eudora recently posted Eudora 5.1.1, the first official release of its email client for Mac OS X, as noted by VersionTracker. Eudora is available as a free download and can run in a free, fully feature ad-supported mode, a paid mode (US$39.95), or the free Lite mode that lacks ads. Eudora 5.1.1 is also available for Mac OS 8/9.