Windows NT 3.1 build 475

Windows NT 3.10.475.1 is mentioned in an internal Microsoft e-mail from 1993-08. Apparently, this build was delivered to Novell in 1993-06 to test their NetWare Client for NT. The e-mail also claims Novell had also received the April 1993 beta sometime earlier.

It was found on 2017-02-25 and uploaded to BetaArchive. This build refers itself in the boot screen and Winver as build 4755.