POP3 is an invalid server name, but often filled in as the server name
if you don't supply one. Ask your email provider (who is probably
also your internet provider) for their instructions for setting up to
use their email servers. If they haven't written instructions for
Windows Mail yet, use their instructions for Outlook Express but
under Windows Mail instead. The instructions are probably
somewhere on their web site. Or, you could tell us who your email
provider is and see if anyone here already knows where to find the
instructions.