Windows Longhorn/6.0.4089.private lab06 dev ux.040721-1800

Windows "Longhorn" build 4089 (with a build tag of 4089.private_lab06_dev_ux.040721-1800) is a Milestone 7 build of the Microsoft Windows "Longhorn" operating system.

One screenshot of this build has been released, which shows a prototype version of Windows Movie Maker based on the Windows Presentation Foundation.