How to backup my emails from yahoo mail?

I would like to backup all emails (sent and received) from my yahoo mail. I would prefer to back it up (without deleting the original emails) to Mozilla Thunderbird.Thanks.

You might try the webmail add-on/plugin/extenstion for Thunderbird to see if it fits your needs.

http://miniupdates.com/2008/09/04/mozilla-thunderbird-addonwebmail-integrate-webmail-with-thunderbird/