Windows 10 Build 9909 [updated] <2027>

Because this is a pre-release build, it is no longer supported by Microsoft and is intended strictly for historical research or hobbyist use.

More pages were moved from Control Panel, but the UI was less mature. The build had a mix of old/new dialogs.

The Start menu had a translucent “Acrylic-like” effect (predecessor to later transparency). The “All Apps” view was redesigned. windows 10 build 9909

More intriguingly, build 9909 still acknowledged the existence of Windows Phone. Buried in the system files were references to "MdmSvc" (Mobile Device Management) and early notification synchronization between a phone and PC—features that would not fully materialize until the "Project Rome" updates years later. It was a hint that Microsoft genuinely believed Windows 10 Mobile would be competitive.

: 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 Because this is a pre-release build, it is

Here’s a concise guide to , a leaked development version from early 2015.

Some features were disabled by default but could be enabled (e.g., “Spartan” browser – later Microsoft Edge). The Start menu had a translucent “Acrylic-like” effect

ISO images of this build can still be found on archival sites like The Internet Archive .

: It began the transition away from traditional menus by removing the Windows Update link directly from the classic Control Panel. Community Perspectives

In the community of "build hunters"—collectors who archive pre-release software—Build 9909 has become something of a "white whale."