Windows 10 build 10166

Windows 10 build 10166 is the last Insider Preview of the original release of Windows 10, which was released to the Fast Ring on 9 July 2015. It is the last officially released pre-release build of this version, as it was followed by the final build on 15 July, although an RTM candidate, build 10176, has leaked online 5 days earlier. There are no significant differences from prior builds.