Windows Longhorn build 4050 (private/lab06 demo.031018-2015)

Windows Longhorn build 4050 (private/lab06 demo.031018-2015) is a private build of Windows Longhorn. At this point, the high-resolution icons have been made, which wouldn't be used until Windows Server 2008 build 4066. While it has the same build number and lab as another build, this build was compiled a day earlier. This build was demonstrated at PDC 2003.