Windows Longhorn build 4002 (Lab06 N)

Windows "Longhorn" build 4002 is one of the first Milestone 4 builds of the Microsoft Windows "Longhorn" operating system. This build makes use of the Desktop Composition Engine seen in earlier Milestone 3 builds 3706 and 3718, which makes it one of the last builds to use full DCE in the M4 stage.

Unlike later Milestone 4 builds, build 4002 uses the old setup based routine instead of the newer one based on the WIM installation format. This is the first Milestone 4 build to use the new background unlike build 4001, which still uses the old M3 background.

This build hasn't leaked, but details were given by Grabberslasher at his UX.Unleaked blog. WinUnleaked also had images of the build.