Windows 8 build 8509

Windows 8 build 8509 is a pre-RTM build of Windows 8, which was released to Microsoft partners participating in the Ecosystem Engineering Access Program (EEAP), as indicated by the  branch. It was first shown running on a Lenovo ThinkPad Tablet 2 reviewed by tech review website Booredatwork.com.The ARM32 compile of this build under the Hebrew (Israel) localization was later uploaded onto the Internet Archive on 20 February 2023.

This build includes Microsoft Office 2013 build 4128.1015 (HomeStudentPre edition) preinstalled, with setup files in the  directory.