bill - 8:33 am on Oct 21, 2010 (gmt 0)
Are you talking about the security of the Windows Live account? Microsoft doesn't use the MSN name for much more than its portal website these days. MSN Messenger is now Windows Live Messenger for example.
When you speak of phones, are you talking about phone numbers listed within your Live account, or are you interested in the upcoming Windows Phone 7 systems?