I am well known here, I hope, as a Microsoft apologist of sorts. I think they make the best products for most implementations, and I love most of their products.
However, Hotmail is, I believe, the single largest email system in the world. It has more mailboxes for a single domain/mx than any other on earth.
And, quite honestly, we must admit that Windows, all of it designed to run on x86 platforms, just won't scale up to the kind of system required to make something like that work. (Yes, I know NT 4 would run on Alpha systems, but it still doesn't scale as well as VMS would on the same systems).
Microsoft continues to make inroads into enterprise level computing. Certainly the ability to run Microsoft.com, one of the top five Internet sites in the world in terms of hits and traffic, so securely and quickly as it has been run for so many years on IIS, is tribute to the scalability of some Microsoft products. But they're not all there yet.
Exchange is my favorite Microsoft product of all (though XP is a close second), and if I had a million mailbox installation that I had to make, I would seriously doubt if it would be an Exchange based system. Sendmail starts looking VERY attractive at those levels of scale.
And Hotmail has, what, 60 million + mailboxes???
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