Seems they will be working with the <
Mozilla Group>
New versions ( and upgrades, if any ) will be free, but if you act now, you can pay $19.95!
Of course, I dumped a download of Thunderbird just this week, never did take a look of it and needed to reuse the drive space.
Whatever I eventually replace Eudora with must be able to use SpamSieve or something as good.