US-based free Yahoo accounts have webmail access only, no
POP access. Windows Mail handles POP mail but not webmail.
There are two Yahoo solutions:
1. How did you access Yahoo mail before? If you are happy with
webmail via your browser, you can continue to use that.
2. Pay Yahoo to get their premium "Mail Plus" service:
http://help.yahoo.com/l/us/yahoo/mail/original/mailplus/overview/index.html
and use the special settings for that service:
http://help.yahoo.com/l/us/yahoo/mail/original/mailplus/pop/pop-14.html
If you are OK with using a non-Yahoo email address, you have three other
solutions:
* Use the email address assigned to you by your ISP.
* Get a free Gmail account.
* Get a free Hotmail/Live account, and use it with the Windows Live Mail email program.