Windows Longhorn build 4067 (private/lddm dev tech(davidmo))

Windows Longhorn build 4067 is a Milestone 7 build of Windows Longhorn. It was shown during WinHEC 2004 when Jim Allchin used it to demonstrate the then-new Longhorn Display Driver Model (later renamed to the "Windows Display Driver Model").

A presentation photograph featuring two screenshots of this build was first shared by LucasB on 26 May 2021 — a high resolution version of the two screenshots were later leaked by ReflectiaX on the same day.