Windows 10/10.0.9901.winmain prs.141202-1718

Windows 10 build 9901 (with a build tag of 9901.winmain prs.141202-1718) is a pre-release build of the Microsoft Windows 10 operating system. This build leaked on December 14, 2014. This is the first build to include working Cortana. It also has a Store Beta and a Camera Beta.