I have one person who I have been unable to receive e-mails from. I have looked at everything, that I know to check. Can someone help?

I still need you to check your account settings even though you already tried to resolve this on your end. You can visit these solution posts for the steps on how to do this:

http://windowslivehelp.com/solutions/settings/archive/2009/02/18/not-receiving-e-mail-from-contacts.aspx 

http://windowslivehelp.com/solutions/settings/archive/2009/03/03/how-to-set-or-change-reply-address.aspx

Note: I've moved your post to the Mail Delivery forum because this is the appropriate one for it.