Windows 10 - Build 9909

: It is well-regarded by collectors for being a mix of older and newer designs, specifically being the last build to feature the Charms bar from Windows 8 while also enabling the new XAML-based Start menu by default. Window Borders : This was the final build to use the thicker Windows 8.x-style title bars for Win32 applications. Control Panel Shifts

Build 9909 was succeeded shortly after its leak by Build 9926 , which became the official "January Technical Preview" and introduced more polished features like the Cortana search bar. windows 10 build 9909