I remember a HP machine (@600Mhz) which my company bought circa 2001 that came with an install CD that had both NT 4.00 and Windows 2000 and the user could deci

I remember a HP machine (@600Mhz) which my company bought circa 2001 that came with an install CD that had both NT 4.00 and Windows 2000 and the user could decide to install the one or the other, a few machines had initially NT 4.00 due to some accounting software that did not run (for whatever reasons) on Windows 2000, while some had 2K installed. Of course the NT 4.0 was a bit faster, but not that much with "common" programs (Office and similar). The occupation on disk of the OS was however 3x (NT 4.00 was around 180 MB, 2K around 650 MB).