Not sure what you mean...
Windows Mail is an email program that can access POP and IMAP email server
accounts.
It cannot access http (webmail) accounts.
If you want to access Hotmail, you can use the newer Windows Live Mail beta. http://get.live.com/betas/maildesktop_betas
I assume that what you are really asking is, what email account settings
should be entered into Windows Mail?
That depends totally on who your Internet service or mail provider is.
Do you have an email address besides the @yahoo.com one?
US-based free Yahoo email accounts are webmail only, and therefore
can not be used with Windows Mail.
If you want to set up your ISP email, let us know who your ISP is.
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