Please unlock your Caps Lock key.
Is your Yahoo account a free one, a paid one, or sponsored through your
ISP (AT&T or Verizon)? The bad news is that US-based free Yahoo accounts
have webmail access only, no POP access. Windows Mail handles POP mail
but not Yahoo webmail. Yahoo's solution is to pay them for premium
"Mail Plus" service, see:
http://help.yahoo.com/l/us/yahoo/mail/original/mailplus/overview/index.html
which then requires you to use these 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 these other
solutions that will work with Windows Mail:
* Use the email address assigned to you by your ISP.
* Use a free Gmail, AOL, or Hotmail/Live account.
You can also continue to use Yahoo's webmail:
http://mail.yahoo.com
If you need more help with any of these solutions, just ask.