When I first heard about Windows RT, I got it confused with the old IBM RT PC, but they are not related. Instead, RT is a version of Windows 8 that will run on mobile devices that have ARM CPUs (instead of the familiar Intel/AMD CPUs that we see on desktops and laptops). One downside is that existing Windows applications, those developed prior to Windows 8, will not run on Windows RT without some conversion work. But Microsoft plans to release an ARM-compatible version of Office to help lead the way. Windows RT is an effort by Microsoft to get Windows into the mobile device market. The benefit to users will be Windows’ huge pool of applications. We’ll see how well it works out.