Windows 10 build 9858
|Build of Windows 10|
Windows 10 build 9858 is an unleaked build of Windows 10. This build's existence was confirmed on 8 October 2014 as an ESD file name on WinStore.
On 21 October 2014, Gabriel Aul made a blogpost to Microsoft's "Blogging Windows" blog, which showed a screenshot of this build.