Windows 10 build 10166
|Build of Windows 10|
|Timebomb||2015-10-01 (+90 days)|
Windows 10 build 10166 is a pre-RTM build of Windows 10. This build was released to Windows Insiders on 2015-07-09 only for the Fast ring. It is the last pre-release build of the original release of Windows 10 available officially from Microsoft. It isn't that different to previous builds.