As you may or may not know...Qualcomm has stopped updates of Eudora....
Some of the developers of Eudora over the years are working on
an open source version of Eudora...Presently called PENELOPE...
An actual alpha of Penelope has not yet been released (Maybe a couple of more weeks).
You can however download the Penelope extension for Thunderbird to add
a little bit of Eudora to your Thunderbird now...
Download the .xpi extension here and install in your Thunderbird if you want
to have some of Eudora look and feel back...
I used to use Eudora.
What functionality does the Add-on provide?
pretty much nothing but makes TB look like Eudora.
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As all of ya should know Micro$oft is the Evil Empire, and Windows (a.k.a. Winblows or Windoze) is their greatest general, so please make a difference and install Linux or FreeBSD on yer Windows comp.