Another important aspect to consider is that the NT security model is stricter than Linux. That is the concepts behind Windows NT security could lead to more strictly controlled system. However, the implementation has made Windows NT open to all sorts of attacks. The gaping holes in Internet Explorer are just a few examples. Linux Advantages Security has had years to be tested and verified.
Security is tied to the file.
Can reinstall without fear of having to replace security information manually. Can easily tell if a file has been changed on your system This includes mundane things like the permissions, but also includes more important things like the checksum. Can create tools easily to test for this vulnerability. Firewall functionality is built-in to the server. Can easily check if a new user has logged in changed the default password.