If Microsoft has an OS based on Linux and with good UI and MS support this rocks! Today it's not about OS, but about cloud services and Software used by users.... Email, Calendar, something more valuable... Anyway, Linux is about free configuration, make API for anything you wish, that is important for a user or (heavy-user). iOS and Apple already done this I think. (in some way, You can't change Apple Binary code, but You have API-s to change the behavior of MAC-OS in real world). It's complicated story anyway.