Windows Server 2008 build 4031 is a pre-reset build of Windows Server 2008. On 23 January 2020, this build was listed on a thread by UX.Unleaked blog founder Grabberslasher to be released to BetaArchive's FTP server, and was later released in the ninth set of his 33 Longhorn/Vista builds on 1 February 2020, alongside the main lab compile of 4085, the x86 version of 4083, the main lab compile of this build, its Lab06_n counterpart and build 5520. Unlike build 4028, this build uses the older i386 installation method.