Windows 10 Build 10036 is a pre-release build of the Microsoft Windows 10 operating system. This build leaked on 2015-03-14. It was a candidate for release to Windows Insiders, however due to a few major bugs that seriously affected usability, Microsoft decided that it would not be released. These bugs include (but are not limited to): The x64 Pro compile was leaked on 2015-03-14 to OSBetaArchive.