A google search for "NATO HPWS" returns none of the technical articles I would expect to see about a popular web server. In fact it returns nothing but stories about this particular domain. I really don't know what to make of this, but it sure doesn't look like an actual NATO server, and if I had to guess, I would say the site is probably actually running apache or some other common server, but lying in its http headers.
Ditto. This particular story, actually.
And yeah, on the microsoft bit I was guessing, since the page seems to have a lot of microsoft ads. It certainly isn't in Brussels.
Your guess is the name is as bogus as Ms. Dingbatter? Not the first time I have seen a blind alley like this when it comes to this kind of propaganda.
And I'm not surprised that most servers are unix-based, despite MS's attempts to break into the server market. I don't know about most places, but our host - sasktel - still has the option to request unix.