Tried that back in the day. With it's multiple windows and resultant screen clutter, I thought it stunk. Maybe I tried too soon, before it was refined. (??)
No, that's why it was discontinued. It needed a complete re-write and its developer couldn't see a big enough return for the investment necessary to do so.
Eudora couldn't handle HTML and had a number of other flaws too.
There were, not one, but two separate projects to create a new Eudora. Users didn't like either, and both folded.
This is one of those cases where users bonded with the old product, and because nothing else is that old product, they hate anything else. Users look back with rose-colored glasses. But if you go back and run them, products like Eudora, WordPerfect/Mac, FullWrite, AppleWorks, etc., weren't as awesome as folks seem to remember.