ref the fix for email and dns problems as in the services status page.
Customers using Windows machines may still be seeing the symptoms of this problem due to cached information on their system. To resolve this, we advise anyone experiencing problems to flush their DNS resolver cache and reboot their machines and equipment.
The following can be run from a command line interface (In Windows 2K/XP, click Start > Run, Type 'cmd' and click OK) to achieve this:-
All I get after doing this is
The host 'mail.force9.net' could not be found. Please verify that you have entered the server name correctly. Account: 'mail.force9.net', Server: 'mail.force9.net', Protocol: POP3, Port: 110, Secure(SSL): No, Socket Error: 11001, Error Number: 0x800CCC0D Yes I have tried with and without anti-virus software running.
As far as I can tell the dns resolves to 255.255.255.255