Unbelievable! I may have missed something, but when Eudora opened it looked exactly the same as Thunderbird2.0.0.6 with Penelope. All my accounts were there, as well as the very unusual Theme. The only difference is that I was given a box with e-mail checked .
When I went back to TB2.0.0.6 I found that it was still the default mail, but I could not get any of my IMAP accounts, which I could a couple of hours ago. But, after I checked my stored passwords, the IMAP accounts started working fine.
At this point, I don't know if having Eudora will really be helpful, or will created problems.
I double checked, and Eudora uses my Thunderbird2.0.0.6 profile, no question asked.
The IMAP accounts' passwords were there, but Eudora did not seem to believe me. I deleted and added them again. Other than a couple of links in All Users, there is no trace of Eudora in Documents and Settings. I am not complaining, because I have nine accounts more or less ready to go, but Eudora is TB2.0.0.6 with Penelope. I would not be able to tell them apart,except for the Help|About...
Interestingly, I am using the profile manager switch, i.e. -p to select the profile for TB2.x, out of four possible profiles. But, Eudora goes for the right on, immediately.
UserAgent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a7) Gecko/2007080210 GranParadiso/3.0a7