- Microsoft wins and extends its desktop dominance into phones, online services, tablets and social networking.
- Microsoft loses, and becomes vulnerable to desktops using other operating systems such as Apple's Macs and Google's (GOOG) Chromebooks.
- Meh. Users resist upgrading, and we go on as we have been.
NEW YORK ( TheStreet) -- When I last wrote about Microsoft's ( MSFT) Windows 8, I described its Metro user interface as "one interface to rule them all," because it can be adapted to PCs, tablets, phones, and even game machines. I suggested it might do for Microsoft what Linux did for IBM ( IBM): unify disparate product lines. But it turns out it's more than that. Metro is making Microsoft the most interesting stock in the world. That's because, according to former Apple ( AAPL) and Palm executive Michael Mace, this is the most important rollout Microsoft has had since Windows 3.0 more than 20 years ago, and an entire industry is on the line. There are three possible outcomes: