1961 CTSS 1964 OS/360 (announced) 1965 Multics (announced) OS/360 (shipped) Tape Operating System (TOS) 1966 MS/8 1967 CP/CMS ITS WAITS 1969 ACP (IBM) TENEX Unix 1970 DOS/BATCH 11 (PDP-11) 1971 /A> 1972 MFT MVT RDOS SVS VM/CMS 1973 Alto OS RSX-11D RT-11 VME 1974 MVS (MVS/XA) 1976 /A> TOPS-20 1978 Apple DOS 3.1 (first Apple OS) TripOS VMS 1979 Apple DOS 3.2 1980 Apple DOS 3.3 OS-9 QDOS SOS XDE (Tajo) (Xerox Development Environment) Xenix 1981 MS-DOS 1982 SunOS (1.0) Ultrix 1983 Lisa OS Coherent ProDOS 1984 Macintosh OS (System 1.0) QNX UniCOS 1985 AmigaOS Atari TOS MIPS OS Microsoft Windows 1.0 1986 GS-OS HP-UX 1987 Arthur IRIX (3.0 is first SGI version) Minix /A> (1.0) Microsoft Windows 2.0 1988 A/UX (Apple Computer) LynxOS MVS/ESA OS/400 1989 AIX NeXTSTEP (1.0) RISC OS SCO Unix (release 3) 1990 BeOS (v1) O/A> 1991 Linux 1992 Solaris (2.0 is first not called SunOS) Windows 3.1 1993 Plan 9 FreeBSD NetBSD Windows NT 3.1 (First version of NT) 1995 Digital Unix (aka Tru64 ) OpenBSD OS/390 Windows 95 1997 Mac OS 7.6 (first officially-named Mac OS) 1998 Windows 98 1999 Mac OS 8 2000 AtheOS Mac OS 9 Windows 2000 Windows ME 2001 Mac OS X Windows XP z/OS 2002 Syllable 2003 Windows Server 2003