Couple of very old workhorses are still pulling their ploughs. I’ve used both, not in a long while. I’m not good about getting my email, for one thing.
Pegasus mail
http://www.pmail.com/
Eudora
http://www.eudora.com/
one I’ve never heard of:
http://www.claws-mail.org/win32/
and an “About” page:
http://email.about.com/od/windowsemailclients/tp/free_email_prog.htm
I’m trying an e-mail program called Postbox. So far it looks like it will do the trick. The interface is similar to Thunderbird, and it loaded my Thunderbird address book and letters without hesitation. The only drawback I see is a minor one — it’s shareware, so after a 30-day trial I’ll have to pay $9.95.