# List of Microsoft Windows versions

Microsoft Windows is a computer operating system developed by Microsoft. It was first launched in 1985 as a graphical operating system built on MS-DOS. The initial version was followed by several subsequent releases, and by the early 1990s, the Windows line had split into two separate lines of releases: Windows 9x for consumers and Windows NT for businesses and enterprises. In the following years, several further variants of Windows would be released: Windows CE in 1996 for embedded systems; Pocket PC in 2000 (renamed to Windows Mobile in 2003 and Windows Phone in 2010) for personal digital assistants and, later, smartphones; Windows Holographic in 2016 for AR/VR headsets; and several other editions.

## Personal computer versions

A "personal computer" version of Windows is considered to be a version that end-users or OEMs can install on personal computers, including desktop computers, laptops, and workstations.
The first five versions of Windows–Windows 1.0, Windows 2.0, Windows 2.1, Windows 3.0, and Windows 3.1–were all based on MS-DOS, and were aimed at both consumers and businesses. However, Windows 3.1 had two separate successors, splitting the Windows line in two: the consumer-focused "Windows 9x" line, consisting of Windows 95, Windows 98, and Windows Me; and the professional Windows NT line, comprising Windows NT 3.1, Windows NT 3.5, Windows NT 3.51, Windows NT 4.0, and Windows 2000. These two lines were reunited into a single line with the NT-based Windows XP; this Windows release succeeded both Windows Me and Windows 2000 and had separate editions for consumer and professional use. Since Windows XP, multiple further versions of Windows have been released, the most recent of which is Windows 11. Since Windows 10, Microsoft has effectively turned to the "Windows as a service" servicing model, most likely to ensure it competes with mobile operating systems.
List of Microsoft Windows versions for personal computers :
| Name | Codename | Release date | Version | Editions | Build number | Architecture | End of support |
| Windows 1.01 | Interface Manager | November 20, 1985 | 1.01 | — | — | x86-16 | December 31, 2001 |
| Windows 1.02 | — | May 14, 1986 | 1.02 | — | — | x86-16 | December 31, 2001 |
| Windows 1.03 | — | August 21, 1986 | 1.03 | — | — | x86-16 | December 31, 2001 |
| Windows 1.04 | — | April 10, 1987 | 1.04 | — | — | x86-16 | December 31, 2001 |
| Windows 2.01 | — | December 9, 1987 | 2.01 | — | — | x86-16, IA-32 | December 31, 2001 |
| Windows 2.03 | — | December 9, 1987 | 2.03 | — | — | x86-16, IA-32 | December 31, 2001 |
| Windows 2.1 | — | May 27, 1988 | 2.10 | — | — | x86-16, IA-32 | December 31, 2001 |
| Windows 2.11 | — | March 13, 1989 | 2.11 | — | — | x86-16, IA-32 | December 31, 2001 |
| Windows 3.0 | — | May 22, 1990 | 3.00 | Windows 3.00a Windows 3.0 with Multimedia Extensions | — | x86-16, IA-32 | December 31, 2001 |
| Windows 3.1 | Janus | April 6, 1992 | 3.10 | Windows 3.1 | 103 | x86-16, IA-32 | December 31, 2001 |
| Windows 3.1 | Sparta | October 31, 1992 | 3.10 | Windows for Workgroups 3.1 | 102 | IA-32 | December 31, 2001 |
| Windows NT 3.1 | Razzle | July 27, 1993 | NT 3.1 | Windows NT 3.1 | 528 | IA-32, Alpha, MIPS | December 31, 2000 |
| Windows 3.11 | — | November 8, 1993 | 3.11 | Windows 3.11 | ? | x86-16, IA-32 | December 31, 2001 |
| Windows 3.11 | Snowball | November 8, 1993 | 3.11 | Windows for Workgroups 3.11 | 300 | IA-32 | December 31, 2001 |
| Windows 3.2 | — | November 22, 1993 | 3.2 | Windows 3.2 | 153 | x86-16, IA-32 | December 31, 2001 |
| Windows NT 3.5 | Daytona | September 21, 1994 | NT 3.5 | Windows NT 3.5 Workstation | 807 | IA-32, Alpha, MIPS, PowerPC | December 31, 2001 |
| Windows NT 3.51 | Daytona | May 30, 1995 | NT 3.51 | Windows NT 3.51 Workstation | 1057 | IA-32, Alpha, MIPS, PowerPC | December 31, 2001 |
| Windows 95 | Chicago | August 24, 1995 | 4.00 | Windows 95 | 950 | IA-32 | December 31, 2001 |
| Windows NT 4.0 | Shell Update Release (Tukwila) | August 24, 1996 | NT 4.0 | Windows NT 4.0 Workstation | 1381 | IA-32, Alpha, MIPS, PowerPC | June 30, 2004 |
| Windows 98 | Memphis | June 25, 1998 | 4.10 | Windows 98 | 1998 | IA-32 | July 11, 2006 |
| Windows 98 Second Edition | — | June 10, 1999 | 4.10 | Windows 98 Second Edition | 2222A | IA-32 | July 11, 2006 |
| Windows 2000 | Windows NT 5.0 | February 17, 2000 | NT 5.0 | Windows 2000 Professional | 2195 | IA-32 | July 13, 2010 |
| Windows Me | Millennium | September 14, 2000 | 4.90 | Windows Me | 3000 | IA-32 | July 11, 2006 |
| Windows XP | Whistler | October 25, 2001 | NT 5.1 | Windows XP Starter Windows XP Home Windows XP Professional | 2600 | IA-32 | April 8, 2014 |
| Windows XP | Whistler | October 25, 2001 | NT 5.1 | Windows XP 64-bit Edition | 2600 | Itanium | April 8, 2014 |
| Windows XP | Freestyle | October 29, 2002 | NT 5.1 | Windows XP Media Center Edition | 2600 | IA-32 | April 8, 2014 |
| Windows XP | Harmony | September 30, 2003 | NT 5.1 | Windows XP Media Center Edition 2004 | 2600 | IA-32 | April 8, 2014 |
| Windows XP | Symphony | October 12, 2004 | NT 5.1 | Windows XP Media Center Edition 2005 | 2700 | IA-32 | April 8, 2014 |
| Windows XP | Emerald | October 14, 2005 | NT 5.1 | Windows XP Media Center Edition 2005 Update Rollup 2 | 2710 | IA-32 | April 8, 2014 |
| Windows XP | Anvil | April 25, 2005 | NT 5.2 | Windows XP Professional x64 Edition | 3790 | x86-64 | April 8, 2014 |
| Windows Vista | Longhorn | January 30, 2007 | NT 6.0 | Windows Vista Starter Windows Vista Home Basic Windows Vista Home Premium Windows Vista Business Windows Vista Enterprise Windows Vista Ultimate | 6002 | IA-32, x86-64 | April 11, 2017 |
| Windows 7 | Windows 7 | October 22, 2009 | NT 6.1 | Windows 7 Starter Windows 7 Home Basic Windows 7 Home Premium Windows 7 Professional Windows 7 Enterprise Windows 7 Ultimate | 7601 | IA-32, x86-64 | January 14, 2020 |
| Windows 8 | Windows 8 | October 26, 2012 | NT 6.2 | Windows 8 Windows 8 Pro Windows 8 Enterprise | 9200 | IA-32, x86-64 | January 12, 2016 |
| Windows 8.1 | Blue | October 17, 2013 | NT 6.3 | Windows 8.1 Windows 8.1 Pro Windows 8.1 Enterprise | 9600 | IA-32, x86-64 | January 10, 2023 |
| Windows 8.1 | Blue | May 23, 2014 | NT 6.3 | Windows 8.1 with Bing | 9600 | IA-32, x86-64 | January 10, 2023 |
| Windows 10 | Threshold | July 29, 2015 | NT 10.0 1507 (retroactively) | Windows 10 Home Windows 10 Pro Windows 10 Education Windows 10 Enterprise Windows 10 Pro for Workstations Windows 10 Pro Education Windows 10 S Windows 10 Enterprise LTSC | 10240 | IA-32, x86-64, ARM64 | May 9, 2017 |
| Windows 10 version 1511 | Threshold 2 | November 10, 2015 | 1511 | Windows 10 Home Windows 10 Pro Windows 10 Education Windows 10 Enterprise Windows 10 Pro for Workstations Windows 10 Pro Education Windows 10 S Windows 10 Enterprise LTSC | 10586 | IA-32, x86-64, ARM64 | October 10, 2017 |
| Windows 10 version 1607 | Redstone 1 | August 2, 2016 | 1607 | Windows 10 Home Windows 10 Pro Windows 10 Education Windows 10 Enterprise Windows 10 Pro for Workstations Windows 10 Pro Education Windows 10 S Windows 10 Enterprise LTSC | 14393 | IA-32, x86-64, ARM64 | April 10, 2018 |
| Windows 10 version 1703 | Redstone 2 | April 5, 2017 | 1703 | Windows 10 Home Windows 10 Pro Windows 10 Education Windows 10 Enterprise Windows 10 Pro for Workstations Windows 10 Pro Education Windows 10 S Windows 10 Enterprise LTSC | 15063 | IA-32, x86-64, ARM64 | October 9, 2018 |
| Windows 10 version 1709 | Redstone 3 | October 17, 2017 | 1709 | Windows 10 Home Windows 10 Pro Windows 10 Education Windows 10 Enterprise Windows 10 Pro for Workstations Windows 10 Pro Education Windows 10 S Windows 10 Enterprise LTSC | 16299 | IA-32, x86-64, ARM64 | April 9, 2019 |
| Windows 10 version 1803 | Redstone 4 | April 30, 2018 | 1803 | Windows 10 Home Windows 10 Pro Windows 10 Education Windows 10 Enterprise Windows 10 Pro for Workstations Windows 10 Pro Education Windows 10 S Windows 10 Enterprise LTSC | 17134 | IA-32, x86-64, ARM64 | November 12, 2019 |
| Windows 10 version 1809 | Redstone 5 | November 13, 2018 | 1809 | Windows 10 Home Windows 10 Pro Windows 10 Education Windows 10 Enterprise Windows 10 Pro for Workstations Windows 10 Pro Education Windows 10 S Windows 10 Enterprise LTSC | 17763 | IA-32, x86-64, ARM64 | November 10, 2020 |
| Windows 10 version 1903 | 19H1 | May 21, 2019 | 1903 | Windows 10 Home Windows 10 Pro Windows 10 Education Windows 10 Enterprise Windows 10 Pro for Workstations Windows 10 Pro Education Windows 10 S Windows 10 Enterprise LTSC | 18362 | IA-32, x86-64, ARM64 | December 8, 2020 |
| Windows 10 version 1909 | Vanadium | November 12, 2019 | 1909 | Windows 10 Home Windows 10 Pro Windows 10 Education Windows 10 Enterprise Windows 10 Pro for Workstations Windows 10 Pro Education Windows 10 S Windows 10 Enterprise LTSC | 18363 | IA-32, x86-64, ARM64 | May 11, 2021 |
| Windows 10 version 2004 | Vibranium | May 27, 2020 | 2004 | Windows 10 Home Windows 10 Pro Windows 10 Education Windows 10 Enterprise Windows 10 Pro for Workstations Windows 10 Pro Education Windows 10 S Windows 10 Enterprise LTSC | 19041 | IA-32, x86-64, ARM64 | December 14, 2021 |
| Windows 10 version 20H2 | Vibranium | October 20, 2020 | 20H2 | Windows 10 Home Windows 10 Pro Windows 10 Education Windows 10 Enterprise Windows 10 Pro for Workstations Windows 10 Pro Education Windows 10 S Windows 10 Enterprise LTSC | 19042 | IA-32, x86-64, ARM64 | August 9, 2022 |
| Windows 10 version 21H1 | Vibranium | May 18, 2021 | 21H1 | Windows 10 Home Windows 10 Pro Windows 10 Education Windows 10 Enterprise Windows 10 Pro for Workstations Windows 10 Pro Education Windows 10 S Windows 10 Enterprise LTSC | 19043 | IA-32, x86-64, ARM64 | December 13, 2022 |
| Windows 10 version 21H2 | Vibranium | November 16, 2021 | 21H2 | Windows 10 Home Windows 10 Pro Windows 10 Education Windows 10 Enterprise Windows 10 Pro for Workstations Windows 10 Pro Education Windows 10 S Windows 10 Enterprise LTSC | 19044 | IA-32, x86-64, ARM64 | June 13, 2023 |
| Windows 10 version 22H2 | Vibranium | October 18, 2022 | 22H2 | Windows 10 Home Windows 10 Pro Windows 10 Education Windows 10 Enterprise Windows 10 Pro for Workstations Windows 10 Pro Education Windows 10 S Windows 10 Enterprise LTSC | 19045 | IA-32, x86-64, ARM64 | October 14, 2025 |
| Windows 11 | Cobalt | October 4, 2021 | 21H2 | Windows 11 Home Windows 11 Pro Windows 11 Pro for Workstations Windows 11 Pro Education Windows 11 Education Windows 11 Enterprise Windows 11 SE | 22000 | x86-64, ARM64 | October 10, 2023 |
| Windows 11 version 22H2 | Nickel | September 20, 2022 | 22H2 | Windows 11 Home Windows 11 Pro Windows 11 Pro for Workstations Windows 11 Pro Education Windows 11 Education Windows 11 Enterprise Windows 11 SE | 22621 | x86-64, ARM64 | October 8, 2024 |
| Windows 11 version 23H2 | Nickel | October 31, 2023 | 23H2 | Windows 11 Home Windows 11 Pro Windows 11 Pro for Workstations Windows 11 Pro Education Windows 11 Education Windows 11 Enterprise Windows 11 SE | 22631 | x86-64, ARM64 | November 11, 2025 |
| Windows 11 version 24H2 | Germanium | October 1, 2024 | 24H2 | Windows 11 Home Windows 11 Pro Windows 11 Pro for Workstations Windows 11 Pro Education Windows 11 Education Windows 11 Enterprise Windows 11 SE | 26100 | x86-64, ARM64 | October 13, 2026 |

## Mobile versions

Mobile versions refer to versions of Windows that can run on smartphones or personal digital assistants.
| Name | Codename | Architecture | Release date | Version Number |
| Pocket PC 2000 | Rapier | ARMv4, MIPS, SH-3 | April 19, 2000 | CE 3.0 |
| Pocket PC 2002 | Merlin | ARMv4 | October 4, 2001 | CE 3.0 |
| Windows Mobile 2003 | Ozone | ARMv5 | June 23, 2003 | CE 4.x |
| Windows Mobile 2003 SE | Ozone | ARMv5 | March 24, 2004 | CE 4.x |
| Windows Mobile 5.0 | Magneto | ARMv5 | May 9, 2005 | CE 5.0 |
| Windows Mobile 6.0 | Crossbow | ARMv5 | February 12, 2007 | CE 5.0 |
| Windows Mobile 6.1 | Crossbow | ARMv5 | April 1, 2008 | CE 5.2 |
| Windows Mobile 6.1.4 | 6 on 6 | ARMv5 | November 11, 2008 | CE 5.2 |
| Windows Mobile 6.5 | Titanium | ARMv5 | May 11, 2009 | CE 6.0 |
| Windows Phone 7 | Metro | ARMv7 | October 29, 2010 | CE 6.0 |
| Windows Phone 7.5 | Mango | ARMv7 | September 27, 2011 | CE 6.0 |
| Windows Phone 7.8 | Tango | ARMv7 | February 1, 2013 | CE 6.0 |
| Windows Phone 8 | Apollo | ARMv7 | October 29, 2012 | NT 6.2 |
| Windows Phone 8.1 | Blue | ARMv7 | April 14, 2014 | NT 6.3 |
| Windows 10 Mobile, version 1511 | Threshold 2 | ARMv7 | November 12, 2015 | 1511 |
| Windows 10 Mobile, version 1607 | Redstone 1 | ARMv7 | August 16, 2016 | 1607 |
| Windows 10 Mobile, version 1703 | Redstone 2 | ARMv7 | April 24, 2017 | 1703 |
| Windows 10 Mobile, version 1709 | feature2 | ARMv7 | October 24, 2017 | 1709 |

## Server versions

| Name | Codename | Release date | Version number | Editions | Build number | Architecture | End of support |
| Windows NT 3.1 | Razzle | July 27, 1993 | NT 3.1 | Windows NT 3.1 Advanced Server | 528 | IA-32, Alpha, MIPS | December 31, 2000 |
| Windows NT 3.5 | Daytona | September 21, 1994 | NT 3.5 | Windows NT 3.5 Server | 807 | IA-32, Alpha, MIPS, PowerPC | December 31, 2001 |
| Windows NT 3.51 | Daytona | May 29, 1995 | NT 3.51 | Windows NT 3.51 Server | 1057 | IA-32, Alpha, MIPS, PowerPC | December 31, 2001 |
| Windows NT 4.0 | Shell Update Release | July 29, 1996 | NT 4.0 | Windows NT 4.0 Server Windows NT 4.0 Server Enterprise Windows NT 4.0 Terminal Server Edition | 1381 | IA-32, Alpha, MIPS, PowerPC | December 31, 2004 |
| Windows 2000 | NT 5.0 | February 17, 2000 | NT 5.0 | Windows 2000 Server Windows 2000 Advanced Server Windows 2000 Datacenter Server | 2195 | IA-32 | July 13, 2010 |
| Windows Server 2003 | Whistler Server | April 24, 2003 | NT 5.2 | Windows Server Web Windows Server Standard Windows Server Enterprise Windows Server Datacenter Windows Storage Server Windows Unified Data Storage Server | 3790 | IA-32, x86-64, Itanium | July 14, 2015 |
| Windows Server 2003 R2 | Whistler Server | December 6, 2005 | NT 5.2 | Windows Server Web Windows Server Standard Windows Server Enterprise Windows Server Datacenter Windows Storage Server Windows Unified Data Storage Server | 3790 | IA-32, x86-64, Itanium | July 14, 2015 |
| Windows Server 2008 | Longhorn Server | February 27, 2008 | NT 6.0 | Windows Server Foundation Windows Server Standard Windows Server Enterprise Windows Server Datacenter Windows Server for Itanium-based Systems Windows Storage Server Windows Web Server | 6003 | IA-32, x86-64, Itanium | January 14, 2020 |
| Windows Server 2008 R2 | Windows Server 7 | October 22, 2009 | NT 6.1 | Windows Server Foundation Windows Server Standard Windows Server Enterprise Windows Server Datacenter Windows Server for Itanium-based Systems Windows Storage Server Windows Web Server | 7601 | x86-64, Itanium | January 14, 2020 |
| Windows Server 2012 | Windows Server 8 | September 4, 2012 | NT 6.2 | Windows Server Foundation Windows Server Essentials Windows Server Standard Windows Server Datacenter | 9200 | x86-64 | October 10, 2023 |
| Windows Server 2012 R2 | Windows Server Blue | October 17, 2013 | NT 6.3 | Windows Server Foundation Windows Server Essentials Windows Server Standard Windows Server Datacenter | 9600 | x86-64 | October 10, 2023 |
| Windows Server 2016 | Redstone | October 12, 2016 | 1607 | Windows Server Essentials Windows Server Standard Windows Server Datacenter | 14393 | x86-64 | January 12, 2027 |
| Windows Server, version 1709 | Redstone 3 | October 17, 2017 | 1709 | Windows Server Essentials Windows Server Standard Windows Server Datacenter | 16299 | x86-64 | April 9, 2019 |
| Windows Server, version 1803 | Redstone 4 | April 30, 2018 | 1803 | Windows Server Essentials Windows Server Standard Windows Server Datacenter | 17134 | x86-64 | November 12, 2019 |
| Windows Server, version 1809 | Redstone 5 | November 13, 2018 | 1809 | Windows Server Essentials Windows Server Standard Windows Server Datacenter | 17763 | x86-64 | November 10, 2020 |
| Windows Server 2019 | Redstone 5 | November 13, 2018 | 1809 | Windows Server Essentials Windows Server Standard Windows Server Datacenter | 17763 | x86-64 | January 9, 2029 |
| Windows Server, version 1903 | Redstone 5 | May 21, 2019 | 1903 | Windows Server Essentials Windows Server Standard Windows Server Datacenter | 18362 | x86-64 | December 8, 2020 |
| Windows Server, version 1909 | Vanadium | November 12, 2019 | 1909 | Windows Server Essentials Windows Server Standard Windows Server Datacenter | 18363 | x86-64 | May 11, 2021 |
| Windows Server, version 2004 | Vibranium | June 26, 2020 | 2004 | Windows Server Essentials Windows Server Standard Windows Server Datacenter | 19041 | x86-64 | December 14, 2021 |
| Windows Server, version 20H2 | Iron | October 20, 2020 | 20H2 | Windows Server Essentials Windows Server Standard Windows Server Datacenter | 19042 | x86-64 | August 9, 2022 |
| Windows Server 2022 | Vibranium | August 18, 2021 | 21H2 | Windows Server Essentials Windows Server Standard Windows Server Datacenter | 20348 | x86-64 | October 14, 2031 |
| Windows Server, version 23H2 | Zinc | October 14, 2023 | 23H2 | Windows Server Essentials Windows Server Standard Windows Server Datacenter | 25398 | AMD64 | October 24, 2025 |
| Windows Server 2025 | Germanium | November 1, 2024 | 24H2 | | 26100 | AMD64, ARM64 | October 10, 2034 |

### High-performance computing (HPC) servers

| Name | Codename | Release date | Based on |
| Windows Compute Cluster Server 2003 | — | June 9, 2006 | Windows Server 2003 R2 |
| Windows HPC Server 2008 | Socrates | September 22, 2008 | Windows Server 2008 |
| Windows HPC Server 2008 R2 | — | September 20, 2010 | Windows Server 2008 R2 |

### Windows Essential Business Server

| Name | Codename | Release date | End-of-support date | Build number | Based on |
| Windows Essential Business Server 2008 | Centro | September 15, 2008 | January 14, 2020 | 5700 | Windows Server 2008 |

### Windows Home Server

| Name | Codename | Release date | End-of-support date | Based on |
| Windows Home Server | Quattro | November 4, 2007 | January 8, 2013 | Windows Server 2003 R2 |
| Windows Home Server 2011 | Vail | April 6, 2011 | April 12, 2016 | Windows Server 2008 R2 |

### Windows MultiPoint Server

Windows MultiPoint Server was an operating system based on Windows Server. It was succeeded by the MultiPoint Services role in Windows Server 2016 and Windows Server version 1709. It was no longer being developed in Windows Server version 1803 and later versions.
| Name | Codename | Release date | End-of-support date | Version number | Build number | Based on |
| Windows MultiPoint Server 2010 | Solution Server | February 24, 2010 | July 14, 2020 | NT 6.1 | 537 | Windows Server 2008 R2 |
| Windows MultiPoint Server 2011 | WMS 2 | May 12, 2011 | July 13, 2021 | NT 6.1 | 1600 | Windows Server 2008 R2 Service Pack 1 |
| Windows MultiPoint Server 2012 | WMS 3 | October 30, 2012 | October 10, 2023 | NT 6.2 | 2506 | Windows Server 2012 |

### Windows Small Business Server

| Name | Codename | Release date | End-of-support date | Build number | Based on |
| Small Business Server 2000 | — | February 21, 2001 | July 13, 2010 | 1343 | Windows 2000 Server |
| Windows Small Business Server 2003 | Bobcat | October 9, 2003 | July 14, 2015 | 2893 | Windows Server 2003 |
| Windows Small Business Server 2008 | Cougar | August 21, 2008 | January 14, 2020 | 5601 | Windows Server 2008 |
| Windows Small Business Server 2011 Standard | Windows Small Business Server 7 | December 13, 2010 | January 14, 2020 | 7900 | Windows Server 2008 R2 |
| Windows Small Business Server 2011 Essentials | Colorado | June 28, 2011 | January 5, 2013 | 8800 | Windows Server 2008 R2 |

## Device versions
### ARM-based tablets

In 2012 and 2013, Microsoft released versions of Windows specially designed to run on ARM-based tablets; these versions of Windows, named "Windows RT" and "Windows RT 8.1," were based on Windows 8 and Windows 8.1, respectively. Upon the release of Windows 10 in 2015, the ARM-specific version for large tablets was discontinued; large tablets (such as the Surface Pro 4) were only released with x86 processors and could run the full version of Windows 10. Windows 10 Mobile had the ability to be installed on smaller tablets (up to nine inches); however, very few such tablets were released, and Windows 10 Mobile primarily ended up only running on smartphones until its discontinuation. In 2017, the full version of Windows 10 gained the ability to run on ARM, thus rendering a specific version of Windows for ARM-based tablets unnecessary.
| Name | Release date | Version number | Build number | Based on |
| Windows RT | October 26, 2012 | NT 6.2 | 9200 | Windows 8 |
| Windows RT 8.1 | October 18, 2013 | NT 6.3 | 9600 | Windows 8.1 |

### Mixed reality and virtual reality headsets

| Name | Build number |
| Windows 10 Holographic, version 1607 | 14393 |
| Windows 10 Holographic, version 1803 | 17134 |
| Windows 10 Holographic, version 1809 | 17763 |
| Windows Holographic, version 1903 | 18362 |
| Windows Holographic, version 2004 | 19041 |
| Windows Holographic, version 20H2 | 19041 |
| Windows Holographic, version 21H1 | 20346 |
| Windows Holographic, version 21H2 | 20348 |
| Windows Holographic, version 22H1 | 20348 |

### Surface Hub

Microsoft originally announced the Surface Hub, an interactive whiteboard, in January 2015. The Surface Hub family of devices runs a custom variant of Windows 10 known as Windows 10 Team.
| Name | Build number |
| Windows 10 Team, version 1511 | 10586 |
| Windows 10 Team, version 1607 | 14393 |
| Windows 10 Team, version 1703 | 15063 |
| Windows 10 Team, version 20H2 | 19042 |

### Windows XP-based tablets

Two versions of Windows XP were released that were optimized for tablets. Beginning with Windows Vista, all tablet-specific components were included in the main version of the operating system.
| Name | Codename | Release date | Version number | Build number | Based on |
| Windows XP Tablet PC Edition | — | November 7, 2002 | NT 5.1 | 2600 | Windows XP |
| Windows XP Tablet PC Edition 2005 | Lonestar | August 2004 | NT 5.1 | 2600 | Windows XP |

## Embedded versions
### Windows Embedded Compact

| Name | Codename(s) | Release date |
| Windows CE 1.0 | Pegasus; Alder | November 16, 1996 |
| Windows CE 2.0 | Jupiter; Birch | September 29, 1997 |
| Windows CE 2.1 | — | July 1998 |
| Windows CE 2.11 | — | October 1998 |
| Windows CE 2.12 | — | 1999 |
| Windows CE 3.0 | Cedar; Galileo | 2000 |
| Windows CE 4.0 | Talisker | January 7, 2002 |
| Windows CE 4.1 | Jameson | July 30, 2002 |
| Windows CE 4.2 | McKendric | April 23, 2003 |
| Windows CE 5.0 | Macallan | July 9, 2004 |
| Windows Embedded CE 6.0 | Yamakazi | November 1, 2006 |
| Windows Embedded Compact 7 | Chelan | March 1, 2011 |
| Windows Embedded Compact 2013 | — | June 13, 2013 |

### Windows Embedded Standard

| Name | Codename | Release date | Based on |
| Windows NT Embedded 4.0 | Impala | August 30, 1999 | Windows NT 4.0 Workstation |
| Windows XP Embedded | Mantis | November 28, 2001 | Windows XP Professional |
| Windows Embedded Standard 2009 | — | December 14, 2008 | Windows XP Service Pack 3 |
| Windows Embedded Standard 7 | Quebec | 2010 | Windows 7 |
| Windows Embedded 8 | — | 2013 | Windows 8 |
| Windows Embedded 8.1 | — | 2013 | Windows 8.1 |

### Other embedded versions

* Windows Embedded Industry
* Windows Embedded Automotive

## Cancelled versions
### Cancelled personal computer versions

| Codename | Intended name | Discontinuation | Version | Latest known build number | Notes |
| Cairo | — | 1996 | NT 4.0 | 1175 | Originally announced at the 1991 Microsoft Professional Developers Conference, Cairo was the codename of a project whose charter was to build technologies for a next-generation operating system that would fulfill Bill Gates's vision of "information at your fingertips". Cairo never shipped, although portions of its technologies have since appeared in other products. |
| Nashville | Windows 96 | 1996 | 4.1 | 999 | Nashville was an operating system planned to have been released between Windows 95 and Windows 98, presumably under the "Windows 96" moniker. |
| Neptune | — | Early 2000 | NT 5.50 | 5111 | Neptune, based on the Windows 2000 codebase, was planned to be the first version of Microsoft Windows NT to have a consumer edition variant. A version was sent out to testers but was never released. The teams working on Neptune and Odyssey eventually combined to work on Windows XP. |
| Odyssey | — | Early 2000 | NT 6.0 | — | Odyssey was planned to be the successor of Windows 2000. The teams working on Neptune and Odyssey eventually combined to work on Windows XP. |
| Triton | — | Early 2000 | — | — | Triton was planned to be the successor of Windows Neptune and had been scheduled to be released in March 2001. |
| Blackcomb | — | January 2006 | — | — | Blackcomb was originally planned to be a release of Windows following Windows XP. However, due to the large feature scope planned for Blackcomb, a smaller release codenamed "Longhorn" was planned first, and Blackcomb was delayed to 2003/2004. Both projects faced delays; Longhorn would go on to be released to consumers as "Windows Vista" in January 2007, while development on Blackcomb continued until the Blackcomb project was renamed "Vienna" in early 2006. |
| Vienna | — | July 2007 | — | — | Vienna replaced Blackcomb and was intended as Windows Vista's successor. Vienna was eventually cancelled in favor of a new project codenamed "Windows 7" (which went on to be released in 2009 with the same name). |
| Polaris | — | 2018 | — | 16299 | Cancelled in favor of Santorini |
| Santorini | Windows 10X | May 18, 2021 | 21H1 | 20279 | Microsoft had been reported as working on a new "lite" version of Windows as early as December 2018. Such a version was officially announced under the name "Windows 10X" at an event in October 2019; the operating system was intended to first launch on dual-screen devices. In May 2020, Microsoft announced that Windows 10X would instead be launching on single-screen PCs, such as laptops and 2-in-1 devices, first. However, on May 18, 2021, Microsoft announced that Windows 10X would not be launching (at least not in 2021); many of its features were instead rolled into Windows 11. |

### Cancelled mobile versions

| Codename | Intended name | Discontinuation | Notes |
| Photon | Windows Mobile 7 | September 2008 | Originally a successor of Windows Mobile, it had been scrapped for Windows Phone 7 |
| Phoenix | — | Early 2017 | Cancelled when Microsoft "wound down" its phone efforts. |
| Andromeda | — | Mid-2018 | Much of the work that was put into Andromeda was migrated into Santorini. The Surface Duo, a dual-screen Android-powered smartphone launched by Microsoft in 2020, was loosely based on the prototype hardware that had been used to test Andromeda. |

### Cancelled server versions

| Codename | Intended name | Discontinuation | Latest known build number |
| Cascades | Windows Essential Business Server 2008 R2 | April 7, 2010 | 7224 |