I think I would have to say that Mac OS X is the most revolutionary OS overall up until whatever is released beyond this point.
But, if I were to have to stay on the PC platform, the most revolutionary OS would have to be Windows XP, purely due to the fact that XP brought the NT kernel and architecture to the common Windows user.
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But, if I were to have to stay on the PC platform, the most revolutionary OS would have to be Windows XP, purely due to the fact that XP brought the NT kernel and architecture to the common Windows user.