Microsoft was about to start testing x64 emulation on ARM devices running Windows 10. However, this had no chance to happen until December. Microsoft has finally announced that the feature is now available with Insider Preview Build 21277.
Windows 10 on ARM will soon allow running traditional desktop apps, but only 64-bit. Microsoft is working to add support for x86 applications via a special emulation layer. This will allow the OS to get a variety of software which wasn't previously available on ARM.
Recent Microsoft announcements about Windows 10 arriving on ARM64-based devices and its support for x86 apps has attracted a lot of attention in the tech industry. Many are speculating about the potential success of such devices compared to the ones running Windows RT and whether x86 emulation and support for 32-bit classic apps could make a difference. And now, as sources close to Microsoft and its partners told Digitimes, some OEMs already working on such devices for test purposes.