A more interesting revenue comparison between M$ and Linux might be to related hardware sales. While PC sales are only now stablizing after months of shrinkage, Linux hardware sales (from the likes of IBM et. al.) probably continue to do just fine even in a slow economy because they can give the OS away for free (which is why, of course, IBM supports Linux in the first place).
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A more interesting revenue comparison between M$ and Linux might be to related hardware sales. While PC sales are only now stablizing after months of shrinkage, Linux hardware sales (from the likes of IBM et. al.) probably continue to do just fine even in a slow economy because they can give the OS away for free (which is why, of course, IBM supports Linux in the first place).