Oddly enough, Microsoft had a dual operating system approach back in the 1990s. It developed Windows CE for small devices like PocketPCs (PDAs like the iPaq) an

Oddly enough, Microsoft had a dual operating system approach back in the 1990s. It developed Windows CE for small devices like PocketPCs (PDAs like the iPaq) and tablets, and for Windows Mobile smartphones. CE was also the base for Windows Automotive.