[dragonwriter]

> If Microsoft open sourced Windows and Office they would instantly stop making money

If Microsoft open-sourced Windows and Office and offered enterprise technical support contracts at the same price they offered enterprise licensing contracts for the same level of support that was included in those contracts, they'd probably keep making money, though perhaps somewhat less (they'd probably decrease costs, though, as well, since both the administrative side of license management and building license enforcement mechanisms into all your software has a cost.)