Also - Cairo/WinFS failed because their requirements were not achievable, and there was no real market demand for them. Just like natural language input for th

Also - Cairo/WinFS failed because their requirements were not achievable, and there was no real market demand for them. Just like natural language input for the general market (no one outside of very specific niches actually wants to interact with a computer using voice). What value would a "filesytem" that understands contacts add to a web-server or load balancer? All it does is couple application-specific domains and complexity into layers of the system where they don't belong. No one is debating that it would be nice for all computers to have a unified understanding of what a document and what a contact is, but those are orthogonal requirements to what a filesystem needs to do.