Originally Posted by TCD
I really wonder where you get your information from. Windows 3.11 has user accounts. Windows 95 has user accounts. I hope that is not what you call 'relatively recently'.
3.11 and 95 had user accounts but there were no access privileges so it wasn't really a multi-user OS in the sense that we are talking about here. They were really all just GUIs that ran on top of DOS!
Windows NT was multi-user from the start but the general home consumer had to wait until Windows XP.