This is good to hear. Perhaps this will provide a free solution equivalent to what I use now.
I use a commercial product from a Canadian company that is very similar to Eudora in concept, does it's own HTML rendering (no MSIE or scripting vulnerabilities), has better, more-flexible filtering than Eudora, it's own scripting language, and has very fast indexing. (Earlier versions had some issue with speed of rendering mailbox lists, but this seems to have been resolved.)
I did have to purchase a third-party program to convert my Eudora mail files, as the built-in conversion is awful.
One of the frustrations I had with Eudora was the lack of a scripting language. The "stationery" feature is quite weak and inflexible. I tried using it for semi-automated responses, and it just didn't cut it. (i.e. do Reply With using stationery files for "no such user here", "we didn't send that spam", "I need more details to reset your password", etc.) The problem is you have no control over the order of the original message and the reply. Sometimes you want one first, sometimes the other.