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 disc contains the labels "Neptune 5111.6" and "Dec 1999" at the top, and Microsoft logo at the bottom with copyright information most likely below it.

The build itself is a recompile of build 5111.1. It is unknown if this build was ever distributed outside Microsoft (though that is a possibility) or what the changes since 5111.1 are.