I believe that Davey Jones is on the right track. I am a Network Engineer with a MS in IT Architecture - I have been trouble shooting all day. Here is what I know - it does not affect all my computers that connect wirelessly - I believe this to be merely incidental at this point. It affects all browsers tried. The same computer can connect to another wireless network and it works fine, but when go back to my current setup I cannot connect to hotmail.com. What I believe to be key - I added a wireless router with WAN connection set to DHCP while the Modem from ATT is set at PPOE for the DSL connection. I believe that the mismatch of protocols DHCP and PPOE on the two separate devices is sending up a port/authentication flag that Hotmail cannot properly resolve - the same is happening to other sites of similar types. I haven't tried to locate my PPOE account info yet to try reconfiguring the router to use PPOE instead of DHCP on the WAN end of things.