Windows Neptune build 5111.6

Microsoft Neptune 5.50.5111.6 is an unleaked Neptune build, seen in a Channel9 video.

The video shows the Microsoft archives and various things kept there. The disc containing this build is first seen at about 15:45 on the desk with other Windows merchandise and packaging. The Neptune project is discussed briefly at around 21:05.

The labels on the disc say "Neptune 5111.6" and "Dec 1999" at the top, with the Microsoft logo at the bottom and copyright information most likely below it. The build itself is a recompile of build 5111.1, but it is unknown if this build was ever distributed outside Microsoft (though that is a possibility) or what the changes since 5111.1 are.