Several of the sites I visit use NT. And I can tell, since they give all sorts of errors on connection, too many users, and other problems all the time.
Realize, if you go with M$, you are under their basic "control the world" maxim, and they put limits on everything they allow you to do. Remember the famous "640k is all anyone will ever need" statement.
Also, look at what they just did to Java... tryint to control that "open" technology as well. "Write once, use forever" is just not in M$'s way of thinking. "Write forever, never use" is more like it.