Windows 10 build 9841 (fbl release)

Windows 10 build 9841 (with a build tag of 9841.fbl release.140912-1613) is a pre-release build of the Microsoft Windows 10 operating system. The build was demonstrated by Microsoft on 2014-09-30 and released as a technical preview on 2014-10-01.

This build is the first publicly available build of Windows 10. It was demoed on 2014-09-30 at a closed press conference and released to the public the next day. It replaces the start screen with the start menu.

To run this build your system requires at least: 1 GHz or faster processor, 1 GB or more RAM (for x86) or 2 GB or more (for x64), at least 16 GB of HD space, and a DirectX 9 graphics device with a WDDM driver. The reporting feature also requires a Microsoft account.

Features
This build is quite rough, both in terms of functionality and UX. However, this is to be expected considering the earliness of Windows 10 at this stage.