Shortly after Build 5111 was compiled, Microsoft merged the Neptune team with the "Odyssey" team (the business successor to Windows 2000). This unified project became , which was released in 2001 as Windows XP
Neptune was conceived as a consumer OS based on the Windows NT kernel (unlike Windows 95/98’s DOS-based architecture). That shift promised greater stability, improved security, and better support for modern hardware—features that would later become standard in Windows XP. Neptune’s UI experiments focused on simplifying setup and making common tasks friendlier for nontechnical users. Windows Neptune Build 5111.iso
The "Windows Neptune Build 5111.iso" is classified as in archival communities, though it remains the intellectual property of Microsoft Corporation. Shortly after Build 5111 was compiled, Microsoft merged
: One of the first builds to experiment with multiple users logged in simultaneously without closing programs. Neptune’s UI experiments focused on simplifying setup and