My Verizon DSL with link to MSN not working

As of this afternoon I am unable to access my MSN hotmail account and get e  mail messages and I cannot use my contacts set up under MSN.  I have had a link to MSN from Verizon for several years; but suddenly this PM, I have been unable to get into the MSN system.  Does anyone know what may have caused this?  I have been on the telehpne for over 2 hours with both Verizon and MSN staffers and neither group were helpful.  Each pointing a finger at the other.