It's understandable that MS engineers would enjoy working on a greenfield OS, but what MS are selling is legacy compatibility. If they stop offering that produc

It's understandable that MS engineers would enjoy working on a greenfield OS, but what MS are selling is legacy compatibility. If they stop offering that product, customers will just walk away. They should keep Windows Windows and offer the new one as a "boot to Office", not mentioning any reference to operating systems at all, to set expectations right. That one could really fly with a certain market segment (RDP thin clients are a thing). That's assuming they can get Office proper to work on the new API, it might be the one codebase that is more entangled with legacy windows APIs than any other.