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Apple, I believe, is the Nike of personal computing. Like Nike, it has always been about path-breaking style and revolutionary product developments coming together to deliver a clearly superior product to its consumers. That's why 'Air' is the appropriate brand name for the world's lightest personal computer from Apple. Just like it was the right name for the world's lightest shoe, from Nike. Right, so would 'Air' work just as well if it were tagged to an offering from Microsoft? Obviously not anymore. But what if Microsoft had launched the world lightest operating system (hypothetically speaking, of course) and chosen to call it Microsoft Air? I think not.
I think that after Nike usurped the word 'air' for itself, it needed a company like Nike to take the 'air' back from for other uses. A company like Apple. Not Microsoft.