I am not receiving messages on msn.com account on one computer

I can receive messages on my Iphone and my old backup computer.  Both are Windows 7 computers.  I have used outlook connector to configure email account.  I can send easily from this computer but simply does not receive.  I found a message several days ago that Outlook was having trouble synching with Outlook.com.  I use Office 2007 and Outlook program in it.  Gmail and bellsouth emails work fine as does send feature on msn account simply quit receiving a couple of days ago for no apparent reason.  Help please.