Why aren blank passwords on Windows XP Home Edition flagged?
MBSA does not flag local user accounts with blank passwords for computers running Windows XP using simple file sharing (includes computers running Windows XP Home Edition and computers running Windows XP Professional that are not joined to a domain and that have simple file sharing enabled). By default, these computers do not allow accounts with blank passwords to log on to the computer remotely over the network or for any other logon activity except at the main console logon screen.