Windows NT 5.0

Windows NT 5.0 is what Windows 2000 was titled prior to Beta 3. It is notable for being "overused" in Windows Never Released.

There is also EUR Version, which was created by Windows NT EUR Group. It is Windows 2000, but with NT 5.0 branding. yta also created Windows NT 5.0 SP4, a version of Windows 2000 SP4 that replaced the branding with NT 5.0 Beta 2's branding.