Remember the Lumia 2520, or the Surface 2? What's a Windows RT? Painful questions that no one can answer, except for Microsoft and those who diligently bought their RT tablets back in 2013. Hey, not that the tablets themselves were any bad. Quite the contrary, they ruled from a technical and design standpoint. It was the operating system and high price tags that did them in. Windows RT began with good intentions - it was to take advantage of the ARM architecture's power efficiency and small components to let Microsoft and its partners produce thinner, longer lasting Windows devices.