Re: don't care what they call it...
The last couple of major Windows releases - both server and desktop - have had much lower vulnerability counts than competing OSs like OS-X, SUSE or Redhat - so maybe not.
Because you're including the entire collection of supporting software that comes with the OS. "Windows" is just the OS. SUSE and Redhat are distributions of 1000's of packages.
Perhaps we should take a look at the number of reported vulnerabilities in IE, PDF and Java plug-ins, Outlook, not to mention all the crap bundled with other "free" software, or pre-installed.
I also dread to think what could be found if the source code for any of this was released/leaked...