Microsoft just launched a version of Windows 10 that will run on low-powered ARM hardware. Unlike Windows RT, the version of Windows 8 that powered the original Surface and Surface 2, this is a full version of Windows 10 with an emulation layer that allows it to run traditional desktop apps from outside the Windows Store.
Why Is Microsoft Putting Windows 10 on ARM? - ARM is a different type of processor architecture from the standard Intel x86 and 64-bit Intel architecture used on PCs today. (Even AMD produces chips that are compatible with Intel’s architecture.) Mobile devices like the iPhone, iPad, and Android phones—along with many other smaller devices—have ARM chips instead of Intel chips inside them.