When we wrote about Eudora Pro 4.2.1 recently (see "Eudora Pro Continues to Deliver" in TidBITS 488 and TidBITS 489 ), only the updater for existing owners of Eudora Pro 4.0 was available. Qualcomm has now released both the full commercial package of Eudora Pro 4.2.1 and a 30-day time-limited demo version. The full commercial package includes both the Macintosh and Windows versions of Eudora and costs $50 (a $10 rebate is currently available). The demo version is a 7.7 MB download. If you’re using a previous version of Eudora, Qualcomm recommends making a backup of your Eudora Folder because new features in Eudora Pro 4.2 have caused some file and folder locations to change, making reversion complex. Eudora Pro 4.2.1 requires a 68020 Macintosh or better with at least System 7.1 and 900K of free RAM.