microsoft By nikkistg Nov 20, 1985 Windows 1.0 x86 – 16-bit Dec 9, 1987 Windows 2.0 x86 – 16-bit May 22, 1990 Windows 3.0 x86 – 16-bit Aug 24, 1996 Windows NT 4.0 IA-32, DEC Alpha, MIPS, PowerPC Jun 25, 1998 Windows 98 IA-32 Oct 25, 2001 Windows XP IA-32 Nov 8, 2006 Windows Vista for Business use IA-32, x64 Jan 30, 2007 Windows Vista for Home use; released in fifty countries IA-32, x64 Oct 26, 2012 Windows 8 IA-32, x64 Jul 22, 2015 Windows 7 IA-32, x64