# Timeline of operating systems

"none" is preferred when the title is sufficiently descriptive; see [[WP:SDNONE]]
This article presents a timeline of events in the history of computer operating systems from 1951 to the current day. For a narrative explaining the overall developments, see the History of operating systems.

## 1950s

* 1951
** LEO I 'Lyons Electronic Office' was the commercial development of EDSAC computing platform, supported by British firm J. Lyons and Co.
* 1953
** DYSEAC - an early machine capable of distributing computing
* 1955
** General Motors Operating System made for IBM 701
** MIT's Tape Director operating system made for UNIVAC 1103
* 1956
** GM-NAA I/O for IBM 704, based on General Motors Operating System
* 1957
** Atlas Supervisor (Manchester University) (Atlas computer project start)
** BESYS (Bell Labs), for IBM 704, later IBM 7090 and IBM 7094
* 1958
** University of Michigan Executive System (UMES), for IBM 704, 709, and 7090
* 1959
** SHARE Operating System (SOS), based on GM-NAA I/O

## 1960s

* 1960
** IBSYS (IBM for its 7090 and 7094)
* 1961
** CTSS demonstration (MIT's Compatible Time-Sharing System for the IBM 7094)
** MCP (Burroughs Master Control Program) for B5000
* 1962
** Atlas Supervisor (Manchester University) (Atlas computer commissioned)
** BBN Time-Sharing System
** GCOS (GE's General Comprehensive Operating System, originally GECOS, General Electric Comprehensive Operating Supervisor)
* 1963
** ADMIRAL
** AN/FSQ-32, another early time-sharing system begun
** CTSS becomes operational (MIT's Compatible Time-Sharing System for the IBM 7094)
** JOSS, an interactive time-shared system that did not distinguish between operating system and language
** Titan Supervisor, early time-sharing system begun
* 1964
** Berkeley Timesharing System (for Scientific Data Systems' SDS 940)
** Chippewa Operating System (for CDC 6600 supercomputer)
** Dartmouth Time-Sharing System (Dartmouth College's DTSS for GE computers)
** EXEC 8 (UNIVAC)
** KDF9 Timesharing Director (English Electric) – an early, fully hardware secured, fully pre-emptive process switching, multi-programming operating system for KDF9 (originally announced in 1960)
** OS/360 (IBM's primary OS for its S/360 series) (announced)
** PDP-6 Monitor (DEC) descendant renamed TOPS-10 in 1970
** SCOPE (CDC 3000 series)
* 1965
** BOS/360 (IBM's Basic Operating System)
** DECsys
** TOS/360 (IBM's Tape Operating System)
** Livermore Time Sharing System (LTSS)
** Multics (MIT, GE, Bell Labs for the GE-645) (announced)
** Pick operating system
** SIPROS 66 (Simultaneous Processing Operating System)
** THE multiprogramming system (Technische Hogeschool Eindhoven) development
** TSOS (later VMOS) (RCA)
* 1966
** DOS/360 (IBM's Disk Operating System)
** GEORGE 1 & 2 for ICT 1900 series
** Mod 1
** Mod 2
** Mod 8
** MS/8 (Richard F. Lary's DEC PDP-8 system)
** MSOS (Mass Storage Operating System)
** OS/360 (IBM's primary OS for its S/360 series) PCP and MFT (shipped)
** RAX
** Remote Users of Shared Hardware (RUSH), a time-sharing system developed by Allen-Babcock for the IBM 360/50
** SODA for Elwro's Odra 1204
** Universal Time-Sharing System (XDS Sigma series)
* 1967
** CP-40, predecessor to CP-67 on modified IBM System/360 Model 40
** CP-67 (IBM, also known as CP/CMS)
** Conversational Programming System (CPS), an IBM time-sharing system under OS/360
** Michigan Terminal System (MTS) (time-sharing system for the IBM S/360-67 and successors)
** ITS (MIT's Incompatible Timesharing System for the DEC PDP-6 and PDP-10)
** OS/360 MVT
** ORVYL (Stanford University's time-sharing system for the IBM S/360-67)
** TSS/360 (IBM's Time-sharing System for the S/360-67, never officially released, canceled in 1969 and again in 1971)
** WAITS (SAIL, Stanford Artificial Intelligence Laboratory, time-sharing system for DEC PDP-6 and PDP-10, later TOPS-10)
* 1968
** Airline Control Program (ACP) (IBM)
** B1 (NCR Century series)
** CALL/360, an IBM time-sharing system for System/360
** Real-Time Executive (RTE) – Hewlett-Packard
** THE multiprogramming system (Eindhoven University of Technology) publication
** TSS/8 (DEC for the PDP-8)
** VP/CSS
* 1969
** B2 (NCR Century series)
** B3 (NCR Century series)
** GEORGE 3 For ICL 1900 series
** Multics (MIT, GE, Bell Labs for the GE-645 and later the Honeywell 6180) (opened for paying customers in October)
** RC 4000 Multiprogramming System (RC)
** TENEX (Bolt, Beranek and Newman for DEC systems, later TOPS-20)
** Unics (later Unix) (AT&T, initially on DEC computers)
** Xerox Operating System

## 1970s

* 1970
** DOS-11 (PDP-11)
* 1971
** EMAS
** Kronos
** RSTS-11 2A-19 (First released version; PDP-11)
** RSX-15
** OS/8
* 1972
** B4 (NCR Century series)
** COS-300
** Data General RDOS
** Edos
** MUSIC/SP
** OS/4
** OS 1100
** Operating System/Virtual Storage 1 (OS/VS1)
** Operating System/Virtual Storage 2 R1 (OS/VS2 SVS)
** PRIMOS (written in FORTRAN IV, that didn't have pointers, while later versions, around version 18, written in a version of PL/I, called PL/P)
** Virtual Machine/Basic System Extensions Program Product (BSEPP or VM/SE)
** Virtual Machine/System Extensions Program Product (SEPP or VM/BSE)
** Virtual Machine Facility/370 (VM/370), sometimes known as VM/CMS
* 1973
** Эльбрус-1 (Elbrus-1) – Soviet computer – created using high-level language uЭль-76 (AL-76/ALGOL 68)
** Alto OS
** CP-V (Control Program V)
** RSX-11D
** RT-11
** VME – implementation language S3 (ALGOL 68)
* 1974
** ACOS-2 (NEC)
** ACOS-4
** ACOS-6
** CP/M
** DOS-11 V09-20C (Last stable release, June 1974)
** Hydra – capability-based, multiprocessing OS kernel
** MONECS
** Multi-Programming Executive (MPE) – Hewlett-Packard
** Operating System/Virtual Storage 2 R2 (MVS)
** OS/7
** OS/16
** OS/32
** Sintran III
* 1975
** BS2000 V2.0 (First released version)
** COS-350
** ISIS
** NOS (Control Data Corporation)
** OS/3 (Univac)
** VS/9 (formerly RCA's TSOS, later named VMOS)
** Version 6 Unix
** XVM/DOS
** XVM/RSX
* 1976
** Cambridge CAP computer – all operating system procedures written in ALGOL 68C, with some closely associated protected procedures in BCPL
** Cray Operating System
** DX10
** FLEX
** TOPS-20
** TX990/TXDS
** Tandem Nonstop OS v1
** Thoth
* 1977
** 1BSD
** AMOS
** KERNAL
** OASIS operating system
** OS68
** OS4000
** RMX-80
** System Support Program (IBM System/34 and System/36)
** TRSDOS
** Virtual Memory System (VMS) V1.0 (Initial commercial release, October 25)
** VRX (Virtual Resource eXecutive)
** VS Virtual Memory Operating System
* 1978
** 2BSD
** Apple DOS
** Control Program Facility (IBM System/38)
** Cray Time Sharing System (CTSS)
** DPCX (IBM)
** DPPX (IBM)
** HDOS
** KSOS – secure OS design from Ford Aerospace
** KVM/370 – security retro-fit of IBM VM/370
** Lisp machine (CADR)
** MVS/System Extensions (MVS/SE)
** OS4 (Naked Mini 4)
** PTDOS
** TRIPOS
** UCSD p-System (First released version)
* 1979
** Atari DOS
** 3BSD
** CP-6
** Idris
** MP/M
** MVS/System Extensions R2 (MVS/SE2)
** NLTSS
** POS
** Sinclair BASIC
** Transaction Processing Facility (TPF) (IBM)
** UCLA Secure UNIX – an early secure UNIX OS based on security kernel
** UNIX/32V
** DOS/VSE
** Version 7 Unix

## 1980s

* 1980
** 86-DOS
** AOS/VS (Data General)
** Business Operating System
** CTOS
** MVS/System Product (MVS/SP) V1
** NewDos/80
** OS-9
** RMX-86
** RS-DOS
** SOS
** Virtual Machine/System Product (VM/SP)
** Xenix
* 1981
** Acorn MOS
** Aegis SR1 (First Apollo/DOMAIN systems shipped on March 27)
** CP/M-86
** iMAX – OS for Intel's iAPX 432 capability machine
** MCS (Multi-user Control System)
** MS-DOS
** PC DOS
** Pilot (Xerox Star operating system)
** UNOS
** UTS
** V
** VERSAdos
** VRTX
** VSOS (Virtual Storage Operating System)
** Xinu first release
* 1982
** Commodore DOS
** LDOS (By Logical Systems, Inc. – for the Radio Shack TRS-80 Models I, II & III)
** pSOS
** QNX
** Stratus VOS
** Sun UNIX (later SunOS) 0.7
** Ultrix
** Unix System III
** VAXELN
* 1983
** Coherent
** DNIX
** EOS
** GNU (project start)
** Lisa Office System 7/7
** LOCUS – UNIX compatible, high reliability, distributed OS
** MVS/System Product V2 (MVS/Extended Architecture, MVS/XA)
** Novell NetWare (S-Net)
** PERPOS
** ProDOS
** RTU (Real-Time Unix)
** STOP – TCSEC A1-class, secure OS for SCOMP hardware
** SunOS 1.0
** VSE/System Package (VSE/SP) Version 1
* 1984
** AMSDOS
** CTIX (Unix variant)
** DYNIX
** Mac OS (System 1.0)
** MSX-DOS
** NOS/VE
** PANOS
** PC/IX
** ROS
** Sinclair QDOS
** QNX
** SINIX
** UNICOS
** Venix 2.0
** Virtual Machine/Extended Architecture Migration Assistance (VM/XA MA)
* 1985
** AmigaOS
** Atari TOS
** DG/UX
** DOS Plus
** Graphics Environment Manager
** Harmony
** MIPS RISC/os
** Oberon – written in Oberon
** SunOS 2.0
** Version 8 Unix
** Virtual Machine/Extended Architecture System Facility (VM/XA SF)
** Windows 1.0
** Windows 1.01
** Xenix 2.0
* 1986
** AIX 1.0
** Cronus distributed OS
** FlexOS
** GEMSOS – TCSEC A1-class, secure kernel for BLACKER VPN & GTNP
** GEOS
** Genera 7.0
** HP-UX
** SunOS 3.0
** TR-DOS
** TRIX
** Version 9 Unix
* 1987
** Arthur (much improved version came in 1989 under the name RISC OS)
** BS2000 V9.0
** IRIX (3.0 is first SGI version)
** MDOS
** MINIX 1.0
** OS/2 (1.0)
** PC-MOS/386
** Topaz – semi-distributed OS for DEC Firefly workstation written in Modula-2+ and garbage collected
** Windows 2.0
* 1988
** A/UX (Apple Computer)
** AOS/VS II (Data General)
** CP/M rebranded as DR-DOS
** Flex machine – tagged, capability machine with OS and other software written in ALGOL 68RS
** GS/OS
** HeliOS 1.0
** KeyKOS – capability-based microkernel for IBM mainframes with automated persistence of app data
** LynxOS
** Mac OS (System 6)
** MVS/System Product V3 (MVS/Enterprise Systems Architecture, MVS/ESA)
** OS/2 (1.1)
** OS/400
** RISC iX
** SpartaDOS X
** SunOS 4.0
** TOPS-10 7.04 (Last stable release, July 1988)
** Virtual Machine/Extended Architecture System Product (VM/XA SP)
** VAX VMM – TCSEC A1-class, VMM for VAX computers (limited use before cancellation)
* 1989
** Army Secure Operating System (ASOS) – TCSEC A1-class secure, real-time OS for Ada applications
** EPOC (EPOC16)
** NeXTSTEP (1.0)
** OS/2 (1.2)
** RISC OS (First release was to be called Arthur 2, but was renamed to RISC OS 2, and was first sold as RISC OS 2.00 in April 1989)
** SCO UNIX (Release 3)
** TSX-32
** Version 10 Unix
** Xenix 2.3.4 (Last stable release)

## 1990s

* 1990
** AIX 3.0
** AmigaOS 2.0
** BeOS (v1)
** DOS/V
** Genera 8.0
** iS-DOS
** LOCK – TCSEC A1-class secure system with kernel and hardware support for type enforcement
** MVS/ESA SP Version 4
** Novell NetWare 3
** OS/2 1.3
** OSF/1
** RTEMS
** PC/GEOS
** Windows 3.0
** Virtual Machine/Enterprise Systems Architecture (VM/XA ESA)
** VSE/Enterprise Systems Architecture (VSE/ESA) Version 1
* 1991
** Amoeba – microkernel-based, POSIX-compliant, distributed OS
** GNO/ME
** Linux 0.01-0.1
** Mac OS (System 7)
** MINIX 1.5
** PenPoint OS
** RISC OS 3
** SUNMOS
** Trusted Xenix – rewritten & security enhanced Xenix evaluated at TCSEC B2-class
* 1992
** 386BSD 0.1
** Amiga Unix 2.01 (Latest stable release)
** AmigaOS 3.0
** BSD/386, by BSDi and later known as BSD/OS.
** LGX
** OpenVMS V1.0 (First OpenVMS AXP (Alpha) specific version, November 1992)
** OS/2 2.0 (First i386 32-bit based version)
** Plan 9 First Edition (First public release was made available to universities)
** RSTS/E 10.1 (Last stable release, September 1992)
** SLS
** Solaris 2.0 (Successor to SunOS 4.x; based on SVR4 instead of BSD)
** Windows 3.1
* 1993
** IBM 4690 Operating System
** FreeBSD
** NetBSD
** Novell NetWare 4
** Newton OS
** Nucleus RTOS
** Open Genera 1.0
** OS 2200 (Unisys)
** OS/2 2.1
** PTS-DOS
** Slackware 1.0
** Spring
** Windows NT 3.1 (First Windows NT kernel public release)
* 1994
** AIX 4.0, 4.1
** IBM MVS/ESA SP Version 5
** NetBSD 1.0 (First multi-platform release, October 1994)
** OS/2 Warp 3.0
** Red Hat
** RISC OS 3.5
** SPIN – extensible OS written in Modula-3
* 1995
** Digital UNIX (aka Tru64 UNIX)
** OpenBSD
** OS/390
** Plan 9 Second Edition (Commercial second release version was made available to the general public.)
** Ultrix 4.5 (Last major release)
** Windows 95
* 1996
** AIX 4.2
** Debian 1.1
** JN – microkernel OS for embedded, Java apps
** Mac OS 7.6 (First officially-named Mac OS)
** OS/2 Warp 4.0
** Palm OS
** RISC OS 3.6
** Windows NT 4.0
** Windows CE 1.0
* 1997
** AIX 4.3
** DR-WebSpyder 1.0
** EPOC (EPOC32)
** Inferno
** Mac OS 8
** MINIX 2.0
** Nemesis
** RISC OS 3.7
** SkyOS
** Windows CE 2.0
* 1998
** DR-WebSpyder 2.0
** Junos
** Novell NetWare 5
** RT-11 5.7 (Last stable release, October 1998)
** Solaris 7 (first 64-bit Solaris release – names from this point drop "2.", otherwise would've been Solaris 2.7)
** Windows 98
* 1999
** Amiga OS 3.5 (unofficial)
** AROS (Boot for the first time in Stand Alone version)
** Inferno Second Edition (Last distribution (Release 2.3, c. July 1999) from Lucent's Inferno Business Unit)
** Mac OS 9
** OS/2 Warp 4.5
** RISC OS 4
** Windows 98 (2nd edition)

## 2000s

| Year–month | Windows | Apple | BSD | Linux | Others |
| 2000–01 | | | | | |
| 2000–02 | Windows 2000 | | | | Solaris 8 |
| 2000–03 | | | FreeBSD 4.0 | Red Hat Linux 6.2E | AtheOS BeOS R5 |
| 2000–04 | Pocket PC 2000 | | | | |
| 2000–05 | | | | | MenuetOS |
| 2000–06 | Windows CE 3.0 | | OpenBSD 2.7 | | Plan 9 Third Edition |
| 2000–07 | Windows 2000 Service Pack 1 | | | | OS/400 V4R5 |
| 2000–08 | | | | Debian 2.2 | MorphOS 0.1 |
| 2000–09 | Windows Millennium Edition | Mac OS X Public Beta | | SUSE Linux 7.0 | |
| 2000–10 | | | | | z/OS z/VM MorphOS 0.2 |
| 2000–11 | | | | | |
| 2000–12 | | | NetBSD 1.5 OpenBSD 2.8 | | AmigaOS 3.9 HP-UX 11i |
| 2001–01 | | Mac OS 9.1 | | | |
| 2001–02 | | | | | MorphOS 0.4 |
| 2001–03 | | Mac OS X Cheetah (v10.0) | | | |
| 2001–04 | | | | | |
| 2001–05 | Windows 2000 Service Pack 2 | | | | AIX 5L 5.1 OS/400 V5R1 |
| 2001–06 | | | OpenBSD 2.9 | | |
| 2001–07 | | Mac OS 9.2 | | | eComStation 1.0 |
| 2001–08 | | | | | Haiku |
| 2001–09 | | Mac OS X Puma (v10.1) | | | |
| 2001–10 | Pocket PC 2002 Windows XP Windows XP 64-bit Edition 2002 | | | | Novell NetWare 6.0 |
| 2001–11 | | | | | |
| 2001–12 | | | OpenBSD 3.0 | | OS/2 4.52 |
| 2002–01 | Windows CE 4.x | | | | JX microkernel for Java Sanos microkernel for net appliances K42 microkernel for NUMA machines |
| 2002–02 | | | | | |
| 2002–03 | | | | Red Hat Enterprise Linux 2.1 AS | |
| 2002–04 | | | | SUSE Linux 8.0 | Plan 9 Fourth Edition |
| 2002–05 | | | OpenBSD 3.1 | | Solaris 9 (SPARC) |
| 2002–06 | | | | | |
| 2002–07 | | | | Debian 3.0 | Syllable 0.4.0 |
| 2002–08 | Windows 2000 Service Pack 3 | Mac OS X Jaguar (v10.2) | | | OS/400 V5R2 |
| 2002–09 | Windows XP Service Pack 1 | | NetBSD 1.6 | | OS2000 |
| 2002–10 | | | | | AIX 5.2 |
| 2002–11 | | | OpenBSD 3.2 | | MorphOS 1.0 |
| 2002–12 | | | | | MorphOS 1.1 |
| 2003–01 | | | FreeBSD 5.0 | | Solaris 9 (x86) JNode – JavaOS successor |
| 2003–02 | | | | | MorphOS 1.2 ReactOS 0.1.0 |
| 2003–03 | Windows XP 64-bit Edition 2003 | | | | MorphOS 1.3 |
| 2003–04 | Windows Server 2003 | | | | eComStation 1.1 |
| 2003–05 | | | OpenBSD 3.3 | Red Hat Enterprise Linux 2.1 ES | |
| 2003–06 | Windows 2000 Service Pack 4 Windows Mobile 2003 | | | | OpenVMS 8.0 |
| 2003–07 | | | | | |
| 2003–08 | | | | | Novell NetWare 6.5 MorphOS 1.4 |
| 2003–09 | | | | | HP-UX 11i v2 |
| 2003–10 | | Mac OS X Panther (v10.3) | | Red Hat Enterprise Linux 3 SUSE Linux 9.0 | |
| 2003–11 | | | OpenBSD 3.4 | Fedora Core 1 | |
| 2003–12 | | | | Linux 2.6.0 | XTS-400 |
| 2004–01 | | | | Linux 2.6.1 | ReactOS 0.2.0 |
| 2004–02 | | | | Linux 2.6.2, 2.6.3 | |
| 2004–03 | | | | Linux 2.6.4 | ReactOS 0.2.1 |
| 2004–04 | | | | Linux 2.6.5 | ReactOS 0.2.2 |
| 2004–05 | | | OpenBSD 3.5 | Linux 2.6.6 Fedora Core 2 | |
| 2004–06 | | | | | i5/OS V5R3 ReactOS 0.2.3 |
| 2004–07 | | | DragonFly BSD 1.0 | | |
| 2004–08 | Windows CE 5.x Windows XP Service Pack 2 | | | Linux 2.6.8 | AIX 5.3 eComStation 1.2 |
| 2004–09 | | | | | ReactOS 0.2.4 |
| 2004–10 | | | | Linux 2.6.9 Ubuntu 4.10 | |
| 2004–11 | | | OpenBSD 3.6 | Fedora Core 3 | |
| 2004–12 | | | NetBSD 2.0 | Linux 2.6.10 | |
| 2005–01 | | | | | Solaris 10 ReactOS 0.2.5 |
| 2005–02 | | | | Red Hat Enterprise Linux 4 | OpenVMS 8.2 z/VSE |
| 2005–03 | Windows Server 2003 Service Pack 1 Windows XP Professional x64 Edition | | | Linux 2.6.11 Novell Open Enterprise Server | MorphOS 1.4.4 |
| 2005–04 | | Mac OS X Tiger (v10.4) | DragonFly BSD 1.2 | Ubuntu 5.04 | ReactOS 0.2.6 MorphOS 1.4.5 |
| 2005–05 | Windows Mobile 5.0 | | OpenBSD 3.7 | | |
| 2005–06 | | | | Linux 2.6.12 Fedora Core 4 Debian 3.1 | |
| 2005–07 | | | | | |
| 2005–08 | | | | Linux 2.6.13 | ReactOS 0.2.7 MorphOS 1.4.5 Classic |
| 2005–09 | | | | | |
| 2005–10 | | | | Linux 2.6.14 Ubuntu 5.10 SUSE Linux 10.0 | ReactOS 0.2.8 |
| 2005–11 | | | FreeBSD 6.0 OpenBSD 3.8 | | |
| 2005–12 | | | NetBSD 3.0 | | ReactOS 0.2.9 |
| 2006–01 | | | DragonFly BSD 1.4 | Linux 2.6.15 | i5/OS V5R4 Solaris 10 1/06 |
| 2006–02 | | | | | |
| 2006–03 | Windows Server 2003 R2 | | | Linux 2.6.16 Fedora Core 5 | |
| 2006–04 | | | | | |
| 2006–05 | | | OpenBSD 3.9 | | SymbOS MINIX 3.1.2 |
| 2006–06 | | | | Linux 2.6.17 Ubuntu 6.06 (LTS) | Solaris 10 6/06 |
| 2006–07 | | | DragonFly BSD 1.6 | | |
| 2006–08 | | | | | BS2000/OSD v7.0 ReactOS 0.3.0 |
| 2006–09 | Windows CE 6.0 | | | Linux 2.6.18 | FreeDOS 1.0 OpenVMS 8.3 |
| 2006–10 | | | | Fedora Core 6 Ubuntu 6.10 Slackware 11.0 | |
| 2006–11 | | | OpenBSD 4.0 | Linux 2.6.19 | AmigaOS 4.0 Solaris 10 11/06 |
| 2006–12 | | | | | |
| 2007–01 | Windows Vista | | DragonFly BSD 1.8 | Bharat Operating System Solutions | |
| 2007–02 | Windows Mobile 6.0 | | | Linux 2.6.20 | Inferno Fourth Edition |
| 2007–03 | Windows Server 2003 Service Pack 2 | | | Red Hat Enterprise Linux 5 | ReactOS 0.3.1 |
| 2007–04 | | | | Linux 2.6.21 Ubuntu 7.04 Debian 4.0 | |
| 2007–05 | | iPhone OS 1 | OpenBSD 4.1 | Fedora Linux 7 | |
| 2007–06 | | | | | |
| 2007–07 | | | | Linux 2.6.22 Slackware 12.0 | |
| 2007–08 | | | DragonFly BSD 1.10 | | Solaris 10 8/07 |
| 2007–09 | | iPhone OS 1.1 | | | HP-UX 11i v3 ReactOS 0.3.3 |
| 2007–10 | | Mac OS X Leopard (v10.5) | | Linux 2.6.23 Ubuntu 7.10 | OpenVMS 8.3-1H1 |
| 2007–11 | Windows Home Server | | OpenBSD 4.2 | Fedora Linux 8 gOS | AIX 6.1, |
| 2007–12 | | | NetBSD 4.0 | | |
| 2008–01 | | | | Linux 2.6.24 | ReactOS 0.3.4 |
| 2008–02 | Windows Vista Service Pack 1 Windows Server 2008 | | DragonFly BSD 1.12 FreeBSD 7.0 | | |
| 2008–03 | | | | | IBM i 6.1 Singularity 1.1 |
| 2008–04 | Windows Mobile 6.1 Windows XP Service Pack 3 | | | Linux 2.6.25 Ubuntu 8.04 (LTS) | |
| 2008–05 | | | OpenBSD 4.3 | Fedora Linux 9 Slackware 12.1 | Solaris 10 5/08 OpenSolaris 2008.05 BS2000/OSD v8.0A |
| 2008–06 | | | | SUSE Linux 11.0 | MorphOS 2.0 ReactOS 0.3.5 |
| 2008–07 | | iPhone OS 2 | DragonFly BSD 2.0 | Linux 2.6.26 | |
| 2008–08 | | | | | STOP 6.5 ReactOS 0.3.6 |
| 2008–09 | | iPhone OS 2.1 | | | AmigaOS 4.1 z/OS V1R10 MorphOS 2.1 |
| 2008–10 | | | | Linux 2.6.27 Ubuntu 8.10 Android 1.0 | Solaris 10 10/08 OKL4 3.0 |
| 2008–11 | | iPhone OS 2.2 | OpenBSD 4.4 | Fedora Linux 10 | Singularity 2.0 ReactOS 0.3.7 Genode 8.11 |
| 2008–12 | | | | Linux 2.6.28 Slackware 12.2 | MorphOS 2.2 OpenSolaris 2008.11 |
| 2009–01 | | | | | |
| 2009–02 | | | DragonFly BSD 2.2 | Debian 5.0 Android 1.1 | ReactOS 0.3.8 |
| 2009–03 | | | | Linux 2.6.29 | |
| 2009–04 | | | NetBSD 5.0 | Ubuntu 9.04 Android 1.5 | ReactOS 0.3.9 |
| 2009–05 | Windows Mobile 6.5 Windows Vista Service Pack 2 | | OpenBSD 4.5 | | Solaris 10 5/09 |
| 2009–06 | | iPhone OS 3 | | Linux 2.6.30 Fedora Linux 11 Palm webOS 1 | AmigaOS 4.1 OpenSolaris 2009.06 |
| 2009–07 | | | | | ReactOS 0.3.10 |
| 2009–08 | | Mac OS X Snow Leopard (v10.6) | | Slackware 13.0 | MorphOS 2.3 |
| 2009–09 | | iPhone OS 3.1 | DragonFly BSD 2.4 | Linux 2.6.31 Android 1.6 | |
| 2009–10 | Windows 7 Windows Server 2008 R2 | | OpenBSD 4.6 | Ubuntu 9.10 Android 2.0 | Solaris 10 10/09 MorphOS 2.4 |
| 2009–11 | | | FreeBSD 8.0 | Fedora Linux 12 openSUSE 11.2 | |
| 2009–12 | | | | Linux 2.6.32 | ReactOS 0.3.11 |

## 2010s

| Year–month | Windows | Apple | BSD | Linux | Others |
| 2010–01 | | | | Android 2.1 | AmigaOS 4.1 Upd. 1 |
| 2010–02 | | | | Linux 2.6.33 | |
| 2010–03 | | | | | |
| 2010–04 | | iPhone OS 3.2 | DragonFly BSD 2.6 | Ubuntu 10.04 (LTS) | AmigaOS 4.1 Upd. 2 IBM i 7.1 |
| 2010–05 | | | OpenBSD 4.7 | Linux 2.6.34 Fedora Linux 13 Android 2.2 | eComStation 2.0 |
| 2010–06 | | iOS 4 | | | MorphOS 2.5 OpenVMS 8.4 |
| 2010–07 | | | | openSUSE 11.3 | |
| 2010–08 | | | | Linux 2.6.35 | |
| 2010–09 | | iOS 4.1 | | | Solaris 10 9/10 AIX 7.1 |
| 2010–10 | Windows Phone 7 | | DragonFly BSD 2.8 | Linux 2.6.36 Fedora Linux 14 Ubuntu 10.10 | MorphOS 2.6 ReactOS 0.3.12 |
| 2010–11 | | iOS 4.2 | NetBSD 5.1 OpenBSD 4.8 | Red Hat Enterprise Linux 6 | |
| 2010–12 | | | | Android 2.3 | MorphOS 2.7 |
| 2011–01 | | | | Linux 2.6.37 | |
| 2011–02 | Windows 7 Service Pack 1 | | | Debian 6.0 Android 3.0 | |
| 2011–03 | Windows CE 7.0 | iOS 4.3 | | Linux 2.6.38 openSUSE 11.4 | ReactOS 0.3.13 |
| 2011–04 | Windows Home Server 2011 | | DragonFly BSD 2.10 | Ubuntu 11.04 Slackware 13.37 | |
| 2011–05 | | | OpenBSD 4.9 | Linux 2.6.39 Fedora Linux 15 Android 3.1 | AmigaOS 4.1 Upd. 1 (for Classic) eComStation 2.1 |
| 2011–06 | | iOS 5 | | ChromeOS (first shipped) | 9front |
| 2011–07 | | Mac OS X Lion (v10.7) | | Linux 3.0 Android 3.2 HP webOS 3 | AmigaOS 4.1 Upd. 3 |
| 2011–08 | | | | | |
| 2011–09 | Windows Phone 7.5 | | | | |
| 2011–10 | | | | Linux 3.1 Ubuntu 11.10 Android 4.0 | |
| 2011–11 | | | OpenBSD 5.0 | Fedora Linux 16 openSUSE 12.1 | Solaris 11 11/11 |
| 2011–12 | | | | | AmigaOS 4.1 Upd. 4 |
| 2012–01 | | | FreeBSD 9.0 | Linux 3.2 | FreeDOS 1.1 |
| 2012–02 | | | DragonFly BSD 3.0 | | ReactOS 0.3.14 Minix 3.2 |
| 2012–03 | | iOS 5.1 | | Linux 3.3 Android 4.0.4 | |
| 2012–04 | | | | Ubuntu 12.04 (LTS) | |
| 2012–05 | | | OpenBSD 5.1 | Linux 3.4 Fedora Linux 17 | DexOS |
| 2012–06 | | | | | BS2000/OSD 9.0 MorphOS 3.0 |
| 2012–07 | | OS X Mountain Lion (v10.8) | | Linux 3.5 Android 4.1 openSUSE 12.2 | MorphOS 3.1 AmigaOS 4.1 Upd. 5 |
| 2012–08 | | | | | |
| 2012–09 | Windows Server 2012 | iOS 6 | | Linux 3.6 Slackware 14.0 Qubes OS | |
| 2012–10 | Windows 8 Windows Phone 8 | | NetBSD 6.0 OpenBSD 5.2 | Ubuntu 12.10 | Solaris 11.1 |
| 2012–11 | | | DragonFly BSD 3.2 | Android 4.2 | Haiku R1 Alpha 4 |
| 2012–12 | | | FreeBSD 9.1 | | |
| 2013–01 | | iOS 6.1 | | Fedora Linux 18 | BlackBerry 10 Solaris 10 1/13 |
| 2013–02 | Windows Phone 7.8 | | | | |
| 2013–03 | | | | openSUSE 12.3 | |
| 2013–04 | | | DragonFly BSD 3.4 | Linux 3.9 Ubuntu 13.04 | |
| 2013–05 | | | NetBSD 6.1 OpenBSD 5.3 | Debian 7.0 | ReactOS 0.3.15 MorphOS 3.2 |
| 2013–06 | Windows CE 8.0 (2013) | | | Linux 3.10 | |
| 2013–07 | | | | Fedora Linux 19 Android 4.3 | |
| 2013–08 | | | | | |
| 2013–09 | | iOS 7 | FreeBSD 9.2 | Linux 3.11 | MorphOS 3.3 z/OS Version 2.1 |
| 2013–10 | Windows 8.1 Windows Server 2012 R2 | OS X Mavericks (v10.9) | | Ubuntu 13.10 | |
| 2013–11 | | | DragonFly BSD 3.6 OpenBSD 5.4 | Slackware 14.1 openSUSE 13.1 Android 4.4 Linux 3.12 | |
| 2013–12 | | | | Fedora Linux 20 | MorphOS 3.4 Muen separation kernel |
| 2014–01 | | | FreeBSD 10.0 | Linux 3.13 | |
| 2014–02 | | | | | ReactOS 0.3.16 MorphOS 3.5 |
| 2014–03 | | iOS 7.1 | | Linux 3.14 | |
| 2014–04 | Windows Phone 8.1 | | | Ubuntu 14.04 (LTS) | Solaris 11.2 |
| 2014–05 | | | OpenBSD 5.5 | | |
| 2014–06 | | | DragonFly BSD 3.8 | Linux 3.15 Red Hat Enterprise Linux 7 | MorphOS 3.6 |
| 2014–07 | | | | | |
| 2014–08 | | | | Linux 3.16 | MorphOS 3.7 |
| 2014–09 | | iOS 8 | | | Minix 3.3 |
| 2014–10 | | OS X Yosemite (v10.10) iOS 8.1 | | Ubuntu 14.10 Linux 3.17 | |
| 2014–11 | | | OpenBSD 5.6 FreeBSD 10.1 DragonFly BSD 4.0 | openSUSE 13.2 Android 5.0 | IBM i 7.2 ReactOS 0.3.17 |
| 2014–12 | | | | Linux 3.18 Fedora Linux 21 | |
| 2015–01 | | | | | |
| 2015–02 | | | | Linux 3.19 | |
| 2015–03 | | iOS 8.2 | | | |
| 2015–04 | | iOS 8.3 watchOS 1 | | Linux 4.0 Debian 8.0 Ubuntu 15.04 | Redox OS |
| 2015–05 | | | | Fedora Linux 22 | BS2000/OSD 10.0 |
| 2015–06 | | iOS 8.4 | | Linux 4.1 | MorphOS 3.9 |
| 2015–07 | Windows 10 (1507) | | | | |
| 2015–08 | | | FreeBSD 10.2 | Linux 4.2 | |
| 2015–09 | | OS X El Capitan (v10.11) iOS 9 watchOS 2 | NetBSD 7.0 | | z/OS Version 2.2 |
| 2015–10 | | iOS 9.1 tvOS9 | | Android 6.0 Ubuntu 15.10 | AIX 7.2 Solaris 11.3 |
| 2015–11 | Windows 10 November Update (1511) Windows 10 Mobile (1511) | tvOS9.1 | | Linux 4.3 Fedora Linux 23 openSUSE Leap 42.1 | |
| 2015–12 | | iOS 9.2 watchOS 2.1 tvOS9.2 | | | |
| 2016–01 | | | | Linux 4.4 | Minix 3.4 |
| 2016–02 | | | | | ReactOS 0.4 |
| 2016–03 | | iOS 9.3 watchOS 2.2 tvOS9.3 | OpenBSD 5.9 FreeBSD 10.3 | Linux 4.5 | |
| 2016–04 | | | | Ubuntu 16.04 | IBM i 7.3 ReactOS 0.4.1 |
| 2016–05 | | | | Linux 4.6 | |
| 2016–06 | | | | Slackware 14.2 Fedora Linux 24 Linux Mint 18 | |
| 2016–07 | | | | Linux 4.7 | |
| 2016–08 | Windows 10 Anniversary Update (1607) Windows 10 Mobile Anniversary Update (1607) | | DragonFly BSD 4.6 | Android 7.0 | ReactOS 0.4.2 |
| 2016–09 | Windows Server 2016 (1607) | macOS Sierra (v10.12) iOS 10 watchOS 3 tvOS10 | OpenBSD 6.0 | Linux 4.8 | |
| 2016–10 | | iOS 10.1 watchOS 3.1 | NetBSD 7.0.2 FreeBSD 11.0 | Android 7.1 Ubuntu 16.10 | |
| 2016–11 | | | | Oracle Linux 7.3 Fedora Linux 25 openSUSE Leap 42.2 | ReactOS 0.4.3 |
| 2016–12 | | iOS 10.2 tvOS10.1 | | Linux 4.9 Linux Mint 18.1 | FreeDOS 1.2 |
| 2017–01 | | | | | |
| 2017–02 | | | | Linux 4.10 | ReactOS 0.4.4 |
| 2017–03 | | iOS 10.3 watchOS 3.2 tvOS10.2 | DragonFly BSD 4.8 NetBSD 7.1 | | |
| 2017–04 | Windows 10 Creators Update (1703) Windows 10 Mobile Creators Update (1703) | | OpenBSD 6.1 | Linux 4.11 Ubuntu 17.04 | |
| 2017–05 | | | | | ReactOS 0.4.5 ArcaOS 5.0.0 |
| 2017–06 | | | | Debian 9.0 Fedora Linux 26 | |
| 2017–07 | | | | Linux 4.12 openSUSE Leap 42.3 | BS2000/OSD 11.0 ArcaOS 5.0.1 |
| 2017–08 | | | | Android 8.0 | |
| 2017–09 | | macOS High Sierra (v10.13) iOS 11 watchOS 4 tvOS11 | | Linux 4.13 | ReactOS 0.4.6 |
| 2017–10 | Windows 10 Fall Creators Update (1709) Windows 10 Mobile Fall Creators Update (1709) Windows Server 2016 Fall Creators Update (1709) | iOS 11.1 watchOS 4.1 tvOS11.1 | OpenBSD 6.2 DragonFly BSD 5.0 | Ubuntu 17.10 | |
| 2017–11 | | | | Linux 4.14 Fedora Linux 27 | BareMetal 1.0.0 |
| 2017–12 | | iOS 11.2 watchOS 4.2 tvOS11.2 | | Android 8.1 | ReactOS 0.4.7 |
| 2018–01 | | | | Linux 4.15 | |
| 2018–02 | | | | | ArcaOS 5.0.2 |
| 2018–03 | | iOS 11.3 watchOS 4.3 tvOS11.3 | NetBSD 7.1.2 | | Genode Sculpt EA |
| 2018–04 | Windows 10 April 2018 Update (1803) | | OpenBSD 6.3 DragonFly BSD 5.2 | Linux 4.16 Ubuntu 18.04 (LTS) | ReactOS 0.4.8 |
| 2018–05 | | iOS 11.4 tvOS11.4 | | Fedora Linux 28 openSUSE Leap 15.0 | |
| 2018–06 | | | | Linux 4.17 | Genode Sculpt TC |
| 2018–07 | | | NetBSD 8.0 | SUSE Linux Enterprise 15 | ReactOS 0.4.9 |
| 2018–08 | | | NetBSD 7.2 | Linux 4.18 Android 9.0 | ArcaOS 5.0.3 Solaris 11.4 |
| 2018–09 | | macOS Mojave (v10.14) iOS 12 watchOS 5 tvOS12 | | | Genode Sculpt VC |
| 2018–10 | Windows 10 October 2018 Update (1809) Windows Server 2019 (1809) | iOS 12.1 watchOS 5.1 tvOS12.1 | OpenBSD 6.4 | Linux 4.19 Ubuntu 18.10 Fedora Linux 29 | SerenityOS |
| 2018–11 | | | | | ReactOS 0.4.10 |
| 2018–12 | | | DragonFly BSD 5.4 FreeBSD 12.0 | Linux 4.20 | |
| 2019–01 | | | | | |
| 2019–02 | | | | | |
| 2019–03 | | iOS 12.2 watchOS 5.2 tvOS12.2 | | Linux 5.0 | ReactOS 0.4.11 |
| 2019–04 | | | | Ubuntu 19.04 Fedora Linux 30 | |
| 2019–05 | Windows 10 May 2019 Update (1903) | iOS 12.3 tvOS12.3 | OpenBSD 6.5 NetBSD 8.1 | Linux 5.1 Red Hat Enterprise Linux 8 openSUSE Leap 15.1 | |
| 2019–06 | | | DragonFly BSD 5.6 | SUSE Linux Enterprise 15 SP1 | IBM i 7.4 |
| 2019–07 | | iOS 12.4 watchOS 5.3 tvOS12.4 | | Debian 10.0 Linux 5.2 | ArcaOS 5.0.4 |
| 2019–08 | | | | | |
| 2019–09 | | iOS 13 iOS 13.1 iPadOS 13.1 watchOS 6 tvOS13 | | Linux 5.3 Android 10.0 | ReactOS 0.4.12 |
| 2019–10 | | iOS 13.2 iPadOS 13.2 watchOS 6.1 macOS Catalina (v10.15) | OpenBSD 6.6 | Ubuntu 19.10 Fedora Linux 31 | |
| 2019–11 | Windows 10 November 2019 Update (1909) | | FreeBSD 12.1 | Linux 5.4 | |
| 2019–12 | | iOS 13.3 iPadOS 13.3 | | | |

## 2020s

| Year–month | Windows | Apple | BSD | Linux | Others |
| 2020–01 | | | | Linux 5.5 | |
| 2020–02 | | | NetBSD 9.0 | | |
| 2020–03 | | iOS 13.4 iPadOS 13.4 watchOS 6.2 tvOS13.4 | DragonFly BSD 5.8 | Linux 5.6 | |
| 2020–04 | | | | Ubuntu 20.04 Fedora Linux 32 | ReactOS 0.4.13 |
| 2020–05 | Windows 10 May 2020 Update (2004) | iOS 13.5 iPadOS 13.5 | OpenBSD 6.7 | | OpenVMS 9.0 |
| 2020–06 | | | | Linux 5.7 | ArcaOS 5.0.5 Haiku R1/beta2 |
| 2020–07 | | iOS 13.6 iPadOS 13.6 | | | |
| 2020–08 | | | | Linux 5.8 | ArcaOS 5.0.6 |
| 2020–09 | | iOS 13.7 iPadOS 13.7 iOS 14 iPadOS 14.0 watchOS 7.0 tvOS14.0 | | Android 11 | |
| 2020–10 | Windows 10 October 2020 Update (20H2) | iOS 14.1 iPadOS 14.1 | NetBSD 9.1 OpenBSD 6.8 FreeBSD 12.2 | Linux 5.9 Fedora Linux 33 Ubuntu 20.10 | |
| 2020–11 | | macOS Big Sur (v11.0) iOS 14.2 iPadOS 14.2 watchOS 7.1 tvOS14.2 | | | |
| 2020–12 | | macOS Big Sur (v11.1) iOS 12.5 iOS 14.3 iPadOS 14.3 watchOS 6.3 watchOS 7.2 tvOS14.3 | | Linux 5.10 | |
| 2021–01 | | iOS 14.4 iPadOS 14.4 watchOS 7.3 tvOS14.4 | | | |
| 2021–02 | | macOS Big Sur (v11.2) | | | |
| 2021–03 | | | | | |
| 2021–04 | | macOS Big Sur (v11.3) iOS 14.5 iPadOS 14.5 watchOS 7.4 tvOS14.5 | FreeBSD 13.0 | Fedora Linux 34 | |
| 2021-05 | Windows 10 May 2021 Update (21H1) | macOS Big Sur (v11.4) iOS 14.6 iPadOS 14.6 watchOS 7.5 tvOS14.6 | OpenBSD 6.9 DragonFly BSD 6.0 NetBSD 9.2 | Linux 5.12 Ubuntu 21.04 | |
| 2021-06 | | | | Rocky Linux 8 Linux 5.13 | |
| 2021-07 | | macOS Big Sur (v11.5) iOS 14.7 iPadOS 14.7 watchOS 7.6 tvOS14.7 | | | Haiku R1/beta3 |
| 2021-08 | Windows Server 2022 | | | Linux 5.14 Debian 11.0 | |
| 2021-09 | | macOS Big Sur (v11.6) iOS 14.8 iPadOS 14.8 iOS 15 iPadOS 15.0 watchOS 8.0 tvOS15.0 | | |
| 2021-10 | Windows 11 | macOS Monterey (v12.0) iOS 15.1 iPadOS 15.1 watchOS 8.1 tvOS15.1 | OpenBSD 7.0 | Android 12 Ubuntu 21.10 | |
| 2021-11 | Windows 10 November 2021 Update (21H2) | | | |
| 2021-12 | | macOS Monterey (v12.2) iOS 15.2 iPadOS 15.2 watchOS 8.3 tvOS15.2 | | | ArcaOS 5.0.7 ReactOS 0.4.14 |
| 2022-01 | | iOS 15.3 iPadOS 15.3 watchOS 8.4 tvOS15.3 | | | |
| 2022-02 | | | | Slackware 15.0 | |
| 2022-03 | | macOS Monterey (v12.3) iOS 15.4 iPadOS 15.4 watchOS 8.5 tvOS15.4 | | Android 12L | |
| 2022-04 | | | OpenBSD 7.1 | Ubuntu 22.04 | |
| 2022-05 | | macOS Monterey (v12.4) iOS 15.5 iPadOS 15.5 watchOS 8.6 tvOS15.5 | | | IBM i 7.5 |
| 2022-06 | | | | | |
| 2022-07 | | macOS Monterey (v12.5) iOS 15.6 iPadOS 15.6 watchOS 8.7 tvOS15.6 | | | |
| 2022-08 | | | | Android 13 | |
| 2022-09 | Windows 11 2022 Update (22H2) | macOS Big Sur (v11.7) macOS Monterey (v12.6) iOS 15.7 iPadOS 15.7 iOS 16 watchOS 9.0 tvOS16.0 | | | |
| 2022-10 | | macOS Ventura (13.0) iOS 16.1 iPadOS 16.0 | OpenBSD 7.2 | Ubuntu 22.10 | |
| 2022-11 | | macOS Ventura (13.0.1) iOS 16.1.1 | | | |
| 2022-12 | | iOS 16.2 | | | |
| 2023-01 | | | | | |
| 2023-02 | | | | | |
| 2023-03 | | | | | |
| 2023-04 | | | | |
| 2023-05 | | | | | |
| 2023-06 | | | | | |
| 2023-07 | | | | | |
| 2023-08 | | | | Linux 6.5 | ArcaOS 5.1.0 |
| 2023-09 | | macOS Sonoma (14.0) iOS 17.0 iPadOS 17.0 | | | |
| 2023-10 | | | | Android 14 | |
| 2023-11 | | | | | |
| 2023-12 | | | | | |
| 2024-01 | | | | | |
| 2024-02 | | | | | |
| 2024-03 | | | | | |
| 2024-04 | | | | | |
| 2024-05 | | | | | |
| 2024-06 | | | | | |
| 2024-07 | | | | | |
| 2024-08 | | | | | |
| 2024-09 | | macOS Sequoia (15.0) iOS 18.0 iPadOS 18 watchOS 11 tvOS 18 | | | |
| 2024-10 | Windows 11 2024 Update (24H2) | iOS 18.1 | | Android 15 | |
| 2024-11 | | | | | |
| 2024-12 | | | | | |