One of the perhaps the biggest but easily overlooked revelations Microsoft's BUILD 2017 developer conference didn't happen on stage or with any major press release. It, instead, happened in a 13-minute long video over at Microsoft's Channel 9 site. This video confirms once and for all what developers and perhaps users as well have been hoping for. Windows 10 on ARM will fully support "legacy" win32, a.k.a. x86, software at "nearly" native speeds and without any changes to the programs themselves.