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<< I'm not sure about now, but Hotmail also used to run on Apache and some Unix variant. >>
FreeBSD. Microsoft bought it and didnt switch from the WORKING solution for a while 🙂 >>
Actually, they still haven't switched. They tried. They marched in a legion of their people with practically unlimited budget, but they found out that W2K is simply incapable of handling the workload. The front-end servers were switched to W2K, so the website runs on Windows, but the actual behind the scenes work (the REAL work) is done with FreeBSD.
EDIT: typos etc.