Re: "The only way to do serious computing - servers, supercomputers, science?"
Hi, I'm working for a pretty substantial financial services firm. Just one anecdotal data point but FWIW: we have lots of web servers including app servers used by clients and a whole heap of middleware / db / MQ and whatnot, as well as the usual departmental file & print, AD etc. The production estate's roughly 3:1 Windows to Linux. (Desk-side, including servers, is 100% Windows.)