Well, almost [[:-)]].
The Register is reporting that Microsoft is throwing in the towel as far as NT 4 is concerned on the latest security flaw to affect Windows 2000, XP, and NT 4. They quote Microsoft as saying ‘The architectural limitations of Windows NT 4.0 do not support the changes that would be required to remove this vulnerability.’
So, NT by its very architecture is a security problem. Notice how this has never happened with a *nix based system.