List of Microsoft Windows versions

Original Windows logo from 1985

Current Windows logo (introduced in 2021)

Timeline showing releases of Windows for personal computers and servers

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

[edit]

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 | — | —
Windows 1.03 | — | August 21, 1986 | 1.03 | — | —
Windows 1.04 | — | April 10, 1987 | 1.04 | — | —
Windows 2.01 | — | December 9, 1987 | 2.01 | — | —  | x86-16, IA-32
Windows 2.03 | — | December 9, 1987 | 2.03 | — | —
Windows 2.1 | — | May 27, 1988 | 2.10  | —  | —
Windows 2.11 | — | March 13, 1989 | 2.11  | —  | —
Windows 3.0 | — | May 22, 1990 | 3.00  |

* Windows 3.00a
* Windows 3.0 with Multimedia Extensions

| —
Windows 3.1 | Janus  | April 6, 1992  | 3.10  |

* Windows 3.1

| 103
Sparta[a] | October 31, 1992  |

* Windows for Workgroups 3.1

| 102  | IA-32
Windows NT 3.1 | Razzle[1] | 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
Snowball  |

* Windows for Workgroups 3.11

| 300  | IA-32
Windows 3.2 | — | November 22, 1993 | 3.2  |

* Windows 3.2

| 153  | x86-16, IA-32
Windows NT 3.5 | Daytona  | September 21, 1994 | NT 3.5  |

* Windows NT 3.5 Workstation

| 807  | IA-32, Alpha, MIPS, PowerPC
Windows NT 3.51 | May 30, 1995 | NT 3.51  |

* Windows NT 3.51 Workstation

| 1057
Windows 95 | Chicago | August 24, 1995  | 4.00  |

* Windows 95

| 950  | IA-32
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[b] | June 25, 1998  | 4.10  |

* Windows 98

| 1998  | IA-32 | July 11, 2006
Windows 98 Second Edition | — | June 10, 1999  |

* Windows 98 Second Edition

| 2222A
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 64-bit Edition

| Itanium
Freestyle | October 29, 2002  |

* Windows XP Media Center Edition

| IA-32
Harmony | September 30, 2003  |

* Windows XP Media Center Edition 2004

Symphony | October 12, 2004  |

* Windows XP Media Center Edition 2005

| 2700
Emerald | October 14, 2005  |

* Windows XP Media Center Edition 2005 Update Rollup 2

| 2710
Anvil | April 25, 2005  | NT 5.2  |

* Windows XP Professional x64 Edition

| 3790  | x86-64
Windows Vista | Longhorn[3] | 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[c] | IA-32, x86-64 | April 11, 2017
Windows 7 | Windows 7[4] | 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[d] | 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[5] | 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
May 23, 2014[e] |

* Windows 8.1 with Bing

Windows 10 | Threshold[6][f] | 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  | 10586  | October 10, 2017
Windows 10 version 1607 | Redstone 1  | August 2, 2016  | 1607  | 14393  | April 10, 2018
Windows 10 version 1703 | Redstone 2  | April 5, 2017  | 1703  | 15063  | October 9, 2018
Windows 10 version 1709 | Redstone 3  | October 17, 2017  | 1709  | 16299  | April 9, 2019
Windows 10 version 1803 | Redstone 4  | April 30, 2018  | 1803  | 17134  | November 12, 2019
Windows 10 version 1809 | Redstone 5  | November 13, 2018  | 1809  | 17763  | November 10, 2020
Windows 10 version 1903 | 19H1  | May 21, 2019  | 1903  | 18362  | December 8, 2020
Windows 10 version 1909 | Vanadium  | November 12, 2019  | 1909  | 18363  | May 11, 2021
Windows 10 version 2004 | Vibranium  | May 27, 2020  | 2004  | 19041  | December 14, 2021
Windows 10 version 20H2 | October 20, 2020  | 20H2  | 19042  | August 9, 2022
Windows 10 version 21H1 | May 18, 2021  | 21H1  | 19043  | December 13, 2022
Windows 10 version 21H2 | November 16, 2021  | 21H2  | 19044  | June 13, 2023
Windows 10 version 22H2 | October 18, 2022  | 22H2  | 19045  | October 14, 2025
Windows 11 | Cobalt[g] | 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[h]
Windows 11 version 22H2 | Nickel[i] | September 20, 2022  | 22H2  | 22621  | October 8, 2024[h]
Windows 11 version 23H2 | October 31, 2023  | 23H2  | 22631  | November 11, 2025[h]
Windows 11 version 24H2 | Germanium  | October 1, 2024  | 24H2  | 26100  | October 13, 2026[h]

## Mobile versions

[edit]

See also: Windows Mobile, Windows Phone version history, and Windows 10 Mobile version history

Mobile versions refer to versions of Windows that can run on smartphones or personal digital assistants.

Pocket PC 2000 logo

Logo used for Windows Phone 7.5 and Windows Phone 7.8

Logo used for Windows Phone 8 and Windows Phone 8.1

Logo used for Windows 10 and Windows 10 Mobile

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
Windows Mobile 2003 | Ozone  | ARMv5 | June 23, 2003  | CE 4.x
Windows Mobile 2003 SE | March 24, 2004
Windows Mobile 5.0 | Magneto  | May 9, 2005  | CE 5.0
Windows Mobile 6.0 | Crossbow  | February 12, 2007
Windows Mobile 6.1 | April 1, 2008  | CE 5.2
Windows Mobile 6.1.4 | 6 on 6  | November 11, 2008[8]
Windows Mobile 6.5 | Titanium  | May 11, 2009  | CE 6.0
Windows Phone 7[j] | Metro  | ARMv7 | October 29, 2010
Windows Phone 7.5 | Mango | September 27, 2011
Windows Phone 7.8 | Tango | February 1, 2013
Windows Phone 8 | Apollo  | October 29, 2012  | NT 6.2
Windows Phone 8.1 | Blue  | April 14, 2014  | NT 6.3
Windows 10 Mobile, version 1511 | Threshold 2  | November 12, 2015  | 1511
Windows 10 Mobile, version 1607 | Redstone 1 | August 16, 2016  | 1607
Windows 10 Mobile, version 1703 | Redstone 2 | April 24, 2017  | 1703
Windows 10 Mobile, version 1709 | feature2[9] | October 24, 2017  | 1709

## Server versions

[edit]

Main article: Windows Server

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 | May 29, 1995  | NT 3.51  |

* Windows NT 3.51 Server

| 1057  | 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  | 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 | December 6, 2005  | 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[c] | IA-32, x86-64, Itanium | January 14, 2020
Windows Server 2008 R2 | Windows Server 7  | October 22, 2009  | NT 6.1  | 7601[d] | 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  | 9600  | October 10, 2023
Windows Server 2016 | Redstone  | October 12, 2016  | 1607[10] |

* Windows Server Essentials[k]
* Windows Server Standard
* Windows Server Datacenter

| 14393  | January 12, 2027
Windows Server, version 1709[11] | Redstone 3  | October 17, 2017  | 1709  | 16299  | April 9, 2019
Windows Server, version 1803[12] | Redstone 4  | April 30, 2018  | 1803  | 17134  | November 12, 2019
Windows Server, version 1809  | Redstone 5  | November 13, 2018[13] | 1809  | 17763  | November 10, 2020
Windows Server 2019[10] | Redstone 5  | January 9, 2029[10]
Windows Server, version 1903[10] | Redstone 5  | May 21, 2019  | 1903  | 18362  | December 8, 2020[10]
Windows Server, version 1909[10] | Vanadium  | November 12, 2019  | 1909  | 18363  | May 11, 2021[10]
Windows Server, version 2004[14] | Vibranium  | June 26, 2020  | 2004  | 19041  | December 14, 2021[10]
Windows Server, version

20H2[14]

| Iron  | October 20, 2020  | 20H2  | 19042  | August 9, 2022[10]
Windows Server 2022 | Vibranium  | August 18, 2021  | 21H2[15] | 20348  | October 14, 2031[10]
Windows Server, version 23H2  | Zinc  | October 14, 2023  | 23H2  | 25398  | AMD64  | October 24, 2025
Windows Server 2025 | Germanium  | November 1, 2024  | 24H2  |  | 26100  | AMD64, ARM64 | October 10, 2034

### High-performance computing (HPC) servers

[edit]

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

[edit]

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

[edit]

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

[edit]

Main article: 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 | 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

[edit]

Main article: Windows Server Essentials

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

## Device versions

[edit]

### ARM-based tablets

[edit]

Main article: Windows RT

Windows RT logo

The Surface RT (shown with keyboard cover attached) was the flagship Windows RT device upon its release.

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);[16] 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

[edit]

Main article: Windows Mixed Reality

Name | Build number

|

Windows 10 Holographic, version 1607[17] | 14393
Windows 10 Holographic, version 1803[17] | 17134
Windows 10 Holographic, version 1809[17] | 17763
Windows Holographic, version 1903[18] | 18362
Windows Holographic, version 2004[18] | 19041
Windows Holographic, version 20H2[18] | 19041
Windows Holographic, version 21H1[18] | 20346
Windows Holographic, version 21H2[18] | 20348
Windows Holographic, version 22H1[18] | 20348

### Surface Hub

[edit]

Surface Hub

Main article: 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[19] | 10586
Windows 10 Team, version 1607[19] | 14393
Windows 10 Team, version 1703[19] | 15063
Windows 10 Team, version 20H2[19] | 19042

### Windows XP-based tablets

[edit]

Tablet computer running a "Tablet PC Edition" of Windows XP

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

[edit]

### Windows Embedded Compact

[edit]

Main article: 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 | Yamazaki | November 1, 2006
Windows Embedded Compact 7 | Chelan | March 1, 2011
Windows Embedded Compact 2013 | — | June 13, 2013

### Windows Embedded Standard

[edit]

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

[edit]

* Windows Embedded Industry
* Windows Embedded Automotive

## Cancelled versions

[edit]

### Cancelled personal computer versions

[edit]

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".[20] Cairo never shipped, although portions of its technologies have since appeared in other products.
Nashville[l] | 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.[21][22] The teams working on Neptune and Odyssey eventually combined to work on Windows XP.
Odyssey | — | Early 2000 | NT 6.0[23] | — | 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[m] | — | — | 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[n] | Windows 10X | May 18, 2021[o][25] | 21H1 | 20279  | Microsoft had been reported as working on a new "lite" version of Windows as early as December 2018.[26] 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.[27] 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

[edit]

Codename | Intended name | Discontinuation | Notes

|
|
|

Photon | Windows Mobile 7 | September 2008[28] | Originally a successor of Windows Mobile, it had been scrapped for Windows Phone 7[29][30]
Phoenix | — | Early 2017 | Cancelled when Microsoft "wound down" its phone efforts.[31]
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.[32]

### Cancelled server versions

[edit]

Codename | Intended name | Discontinuation | Latest known build number

|
|
|

Cascades | Windows Essential Business Server 2008 R2 | April 7, 2010[o] | 7224

## See also

[edit]

* List of Microsoft operating systems
* Microsoft Windows version history
* Windows 10 version history
* Windows 11 version history
* Comparison of Microsoft Windows versions
* List of Microsoft codenames

## Notes

[edit]

1. ^ Originally codenamed Winball
2. ^ Has also been called ChiCairo and London.[2]
3. ^ a b Windows Vista and Windows Server 2008 originally had the build number 6000 when they were first released; the build number was increased by one with each of the two subsequent Service Packs.
4. ^ a b Windows 7 and Windows Server 2008 R2 originally had the build number 7600 when they were first released; the build number was increased to 7601 with the release of Service Pack 1.
5. ^ Announcement date
6. ^ Retroactively referred to as Threshold 1
7. ^ The core of Windows 11 version 21H2 is codenamed Cobalt;[7] the "Sun Valley" codename refers to the UI layer of Windows 11 version 21H2 and is commonly used to address Windows 11 version 21H2 as a whole.
8. ^ a b c d The end-of-support date listed in the table refers to Home and Pro editions. Specific versions and editions of Windows 11 have different end of support dates; see template:Windows 11 versions for a breakdown of dates by version and edition.
9. ^ The core of Windows 11 version 22h2 is codenamed Nickel; the "Sun Valley 2" codename refers to the UI layer of Windows 11 version 22H2.
10. ^ Originally named "Windows Phone 7 Series"
11. ^ Between versions 1709 and 20H2 of Windows Server, the "Windows Server Essentials" edition of Windows Server was only included in Windows Server 2019.
12. ^ Nashville was originally codenamed Cleveland.
13. ^ July 2007 is when it was reported that the Vista's successor was codenamed "7", rather than "Vienna", indicating that Vienna's discontinuation had occurred by then. However, Vienna may have been cancelled prior to then.
14. ^ While Santorini was the general codename for Windows 10X, Centaurus was the specific codename for Windows 10X on foldable PCs and Pegasus was the codename for Windows 10X on "traditional" PCs (such as laptops or 2-in-1 computers).[24]
15. ^ a b Date refers to when the cancellation of the operating system was announced. The decision for the operating system to be cancelled may have occurred prior to then.

## References

[edit]

1. ^ "Random internal Windows terminology:IDW, Razzle, and their forgotten partners IDS and Dazzle". The Old New Thing. 2018-12-24. Retrieved 2020-04-09.
2. ^ "Systems Release Strategy - Draft:10/10/93" (PDF). Slated Antitrust. November 10, 1993. Archived from the original (PDF) on January 17, 2023. Retrieved July 19, 2021.
3. ^ Martens, China (July 22, 2005). "Update:Microsoft's Longhorn becomes Windows Vista". IDG Communications, Inc. Retrieved 13 June 2021. "Microsoft Corp. has announced the official name for its upcoming operating system, previously known under the code name Longhorn. The operating system, now due out in 2006, will be called Windows Vista"
4. ^ "What was the code name for Windows 7?". The Old New Thing. 2019-07-22. Retrieved 2021-05-09. "The code name for Windows 7 was… Windows 7."
5. ^ O'Brien, Terrence (19 July 2019). "Microsoft drops the Blue codename, confirms Windows 8.1 will be a free upgrade available later this year". Engadget. Retrieved 30 April 2023. "One of the worst kept secrets rattling around Microsoft's campus is Windows Blue, the forthcoming update to Windows 8 that addresses users' bugbears about the OS. Now, Microsoft is officially rechristening the platform, and with a more staid name: Windows 8.1."
6. ^ Foley, Mary Jo. "Microsoft to share Windows Threshold plans at Build 2014 show: Report". ZDNet. Retrieved 7 April 2022.
7. ^ Parmar, Mayank (3 September 2021). "Windows 11 Build 22449 is now available with new loading animation". Windows Latest. Retrieved 4 September 2021. "Windows 11 version 21H2 (shipping on October 5)=Cobalt (Co)."
8. ^ Foley, Mary Jo. "Microsoft starts rolling out IE 6 for Windows Mobile". ZDNET. Retrieved 23 September 2022. "The new IE 6 bits were released on November 11 as part of the Windows Mobile 6.1.4 release from Microsoft's Download Center Web site."
9. ^ Woods, Rich. "It's finally dead: Windows 10 Mobile is no longer supported after today". Neowin. Neowin LLC. Retrieved 23 December 2021. "Windows 10 feature2 ended up being version 1709, and it was the final feature update for Windows 10 Mobile."
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Microsoft Windows

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MS-DOS-based|

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Windows NT|

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Windows IoT|

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Other|

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