Isn't Thunderbird a POP3 or is it one of those IMAP things?
It will access POP mailboxes.
I use Thunderbird. My favorite was and will always be Eudora but
Qualcomm stopped supporting Eudora and the team went to Thunderbird.
There is a Eudora add on for Thunderbird but all it does is change the
icons to the old Eudora style.