Actually the line of discussion is server load, not whether you need to buy more servers because you spend more money rebooting the one you have.
Now I applaud dell they are eating their own dog food, they sell mainly windows server so to runn *nix would be as embarassing as well, when MS was caught using the tcp/ip stack from BSD. Windows can be made to be a decent server, as I have said we run it as our front end but all the horse paower in the back is either a Mainframe or Unix both of which scale batter and have better uptime..