I’ve moved completely from Outlook Express to Thunderbird
Thunderbird just rocks. My trasition has been very very smooth. I have imported all my old mails into thunderbird with out any pain. Message filtering in thunderbird is supirior to OE. I’m using gotmail to forward my Hotmail mails to yahoo account and using Yahoo POPS to access yahoo mail from within thunderbird.
If you don’t know, Thunderbird is a stand-alone mail client, created as a redesign of the Mozilla mail component. Check why Thunderbird is superior .