Eudora 5.1 is nice! I had been using an old old Eudora Lite (i.e., free, but fewer features), as it was getting less stable, I'd occasionally look at the Eudora site for new versions of Eudora Lite, and not really seeing them -- until superstart Lee Goddard told me that it's not a different download now, but just a mode that you put Eudora in. (Under "Help", "Payment & Registration", you either choose ad-mode, no-ad mode (with a reg code you pay for), or no-ad-but-fewer-features Lite mode.) Who knew?
Software is a happy time.