List of Windows operating systems: Difference between revisions

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!width=15%|Additional information
!width=15%|Additional information
!width=15%|Editions
!width=15%|Editions
!width=15%|Unsupported as of
|-
|-
! colspan="6"|Windows 1.0x
! colspan="7"|Windows 1.0x
|-
|-
|Windows 1.00
|Windows 1.00
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|First release of Windows
|First release of Windows
|rowspan="6"|N/A
|rowspan="6"|N/A
|rowspan="6"|December 31, 2001
|-
|-
|Windows 1.01
|Windows 1.01
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|
|
|-
|-
! colspan="6"|Windows 2.0x
! colspan="7"|Windows 2.0x
|-
|-
|Windows 2.00
|Windows 2.00
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|rowspan="5"|They doesn't work with Intel 80486 processors
|rowspan="5"|They doesn't work with Intel 80486 processors
|rowspan="5"|N/A
|rowspan="5"|N/A
|rowspan="5"|December 31, 2001
|-
|-
|Windows 2.01
|Windows 2.01
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|
|
|-
|-
! colspan="6"|Windows 2.1x
! colspan="7"|Windows 2.1x
|-
|-
|Windows 2.1
|Windows 2.1
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*Windows/386
*Windows/386
*Windows/486
*Windows/486
|rowspan="2"|December 31, 2001
|-
|-
|Windows 2.11
|Windows 2.11
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|
|
|-
|-
! colspan="6"|Windows 3.0x
! colspan="7"|Windows 3.0x
|-
|-
|Windows 3.00
|Windows 3.00
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|Like Windows 2.1x, Windows 3.0x does work with Intel 80486 processors
|Like Windows 2.1x, Windows 3.0x does work with Intel 80486 processors
|rowspan="2"|N/A
|rowspan="2"|N/A
|rowspan="2"|December 31, 2001
|-
|-
|Windows 3.01
|Windows 3.01
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|Sometimes called Windows Graphical Environment with Multimedia Extensions 1.0
|Sometimes called Windows Graphical Environment with Multimedia Extensions 1.0
|-
|-
! colspan="6"|Windows 3.1x
! colspan="7"|Windows 3.1x
|-
|-
|Windows 3.1
|Windows 3.1
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|
|
|rowspan="6"|N/A
|rowspan="6"|N/A
|rowspan="6"|December 31, 2001
|-
|-
|Windows for Workgroups 3.1
|Windows for Workgroups 3.1
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|Chinese version of Windows for Workgroups 3.1x
|Chinese version of Windows for Workgroups 3.1x
|-
|-
! colspan="6"|Windows 9x
! colspan="7"|Windows 9x
|-
|-
|Windows 95
|Windows 95
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*Windows 95 Service Pack 2.1 (August 27, 1997)
*Windows 95 Service Pack 2.1 (August 27, 1997)
*Windows 95 Service Pack 2.5 (November 26, 1997)
*Windows 95 Service Pack 2.5 (November 26, 1997)
|rowspan="2"|December 31, 2001
|-
|-
|Windows 96
|Windows 96
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|In winver, it says 4.10, like Windows 96.
|In winver, it says 4.10, like Windows 96.
|N/A
|N/A
|rowspan="3"|July 11, 2006
|-
|-
|Windows 99
|Windows 99
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|N/A
|N/A
|-
|-
! colspan="6"|Windows NT
! colspan="7"|Windows NT
|-
|-
|Windows NT 3.1
|Windows NT 3.1
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|
|
*Windows NT 3.1 Workstation
*Windows NT 3.1 Workstation
|rowspan="7"|December 31, 2001
|-
|-
|Windows NT for Workgroups 3.1
|Windows NT for Workgroups 3.1
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|
|
*Windows NT 4.0 Workstation
*Windows NT 4.0 Workstation
|December 3, 2004
|-
|-
|Windows NT 5.0
|Windows NT 5.0
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|
|
*Windows NT 5.0 Workstation
*Windows NT 5.0 Workstation
|July 13, 2010
|-
|-
|Windows XP
|Windows XP
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*Windows XP 64-bit Edition
*Windows XP 64-bit Edition
*Windows Fundamentals for Legacy PCs (July 8, 2006)
*Windows Fundamentals for Legacy PCs (July 8, 2006)
|rowspan="2"|April 8, 2014
|-
|-
|Windows XP Professional x64 Edition
|Windows XP Professional x64 Edition
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*Windows Vista Enterprise
*Windows Vista Enterprise
*Windows Vista Ultimate
*Windows Vista Ultimate
|April 11, 2017
|-
|-
|Windows Vienna
|Windows Vienna
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*Windows Vienna Enterprise
*Windows Vienna Enterprise
*Windows Vienna Ultimate
*Windows Vienna Ultimate
|rowspan="3"|January 14, 2020
|-
|-
|Windows 7
|Windows 7
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*Windows 8 Core
*Windows 8 Core
*Windows 8 OEM
*Windows 8 OEM
|rowspan="2"|January 10, 2023
|-
|-
|Windows 8.1
|Windows 8.1
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*Windows 10 IoT Enterprise
*Windows 10 IoT Enterprise
*Windows 10 S (now an operational mode within Enterprise and Education)
*Windows 10 S (now an operational mode within Enterprise and Education)
|October 14, 2025
|-
|-
|Windows 2020
|Windows 2020
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*Windows 2020 IoT Enterprise
*Windows 2020 IoT Enterprise
*Windows 2020 S
*Windows 2020 S
|Not yet released
|}
|}


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!width=15%|Additional information
!width=15%|Additional information
!width=15%|Editions
!width=15%|Editions
!width=15%|Unsupported as of
|-
|-
|Windows NT 3.1
|Windows NT 3.1
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*Windows NT 3.1 Server
*Windows NT 3.1 Server
*Windows NT 3.1 Advanced Server
*Windows NT 3.1 Advanced Server
|rowspan="5"|December 31, 2001
|-
|-
|Windows NT 3.11
|Windows NT 3.11
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*Windows NT 4.0 Enterprise Server
*Windows NT 4.0 Enterprise Server
*Windows NT 4.0 Terminal Server
*Windows NT 4.0 Terminal Server
|December 3, 2004
|-
|-
|Windows Server 2000
|Windows Server 2000
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*Windows Advanced Server 2000
*Windows Advanced Server 2000
*Windows Datacenter Server 2000
*Windows Datacenter Server 2000
|July 13, 2010
|-
|-
|Windows Server 2003
|Windows Server 2003
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*Windows Storage Server 2003
*Windows Storage Server 2003
*Windows Small Business Server 2003
*Windows Small Business Server 2003
|rowspan="2"|July 14, 2015
|-
|-
|Windows Server 2003 R2
|Windows Server 2003 R2
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*Windows Storage Server 2007
*Windows Storage Server 2007
*Windows Web Server 2007
*Windows Web Server 2007
|April 11, 2017
|-
|-
|Windows Server 2008
|Windows Server 2008
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*Windows Storage Server 2008
*Windows Storage Server 2008
*Windows Web Server 2008
*Windows Web Server 2008
|rowspan="3"|January 14, 2020
|-
|-
|Windows Server 2008 R2
|Windows Server 2008 R2
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*Windows Datacenter Server 2012
*Windows Datacenter Server 2012
*Windows MultiPoint Server 2012
*Windows MultiPoint Server 2012
|rowspan="2"|October 10, 2023
|-
|-
|Windows Server 2012 R2
|Windows Server 2012 R2
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*Windows Standard Server 2016
*Windows Standard Server 2016
*Windows Datacenter Server 2016
*Windows Datacenter Server 2016
|January 12, 2027
|-
|-
|Windows Server 2019
|Windows Server 2019
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*Windows Standard Server 2019
*Windows Standard Server 2019
*Windows Datacenter Server 2019
*Windows Datacenter Server 2019
|January 9, 2029
|-
|-
|Windows Server 2020
|Windows Server 2020
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*Windows Standard Server 2020
*Windows Standard Server 2020
*Windows Datacenter Server 2020
*Windows Datacenter Server 2020
|
|}
|}


Revision as of 21:35, 16 August 2019

Personal computer versions

In this section, a client version of Windows is a version that end-users or OEMs can install on personal computers, including desktop computers, laptops and workstations.

Name Version Release date Codename Additional information Editions Unsupported as of
Windows 1.0x
Windows 1.00 1.00 November 6, 1985 Interface Manager First release of Windows N/A December 31, 2001
Windows 1.01 1.01 November 20, 1985
Windows 1.02 1.02 May 14, 1986
Windows 1.03 1.03 August 21, 1986
Windows 1.04 1.04 April 10, 1987
Windows 1.05 1.05 August 21, 1987
Windows 2.0x
Windows 2.00 2.00 December 9, 1987 They doesn't work with Intel 80486 processors N/A December 31, 2001
Windows 2.01 2.01
Windows 2.02 2.02
Windows 2.03 2.03
Windows 2.04 2.04
Windows 2.1x
Windows 2.1 2.1 May 27, 1988
  • Windows/286
  • Windows/386
  • Windows/486
 December 31, 2001
Windows 2.11 2.11 March 13, 1989
Windows 3.0x
Windows 3.00 3.00 May 22, 1990 Like Windows 2.1x, Windows 3.0x does work with Intel 80486 processors N/A December 31, 2001
Windows 3.01 3.01 October 20, 1991 Sometimes called Windows Graphical Environment with Multimedia Extensions 1.0
Windows 3.1x
Windows 3.1 3.1 April 6, 1992 Janus N/A December 31, 2001
Windows for Workgroups 3.1 3.1 October 1992 Kato, Sparta
Windows 3.11 3.11 November 8, 1993 Janus
Windows for Workgroups 3.11 3.11 August 11, 1993 Snowball
Windows 3.2 3.2 November 22, 1993 Janus Chinese version of Windows 3.1x
Windows for Workgroups 3.2 3.2 December 1993 Cougar Chinese version of Windows for Workgroups 3.1x
Windows 9x
Windows 95 4.0 August 24 ,1995 Chicago
  • Windows 95
  • Windows 95 Service Pack 1 (December 31, 1995)
  • Windows 95 Service Pack 1.1 (February 14, 1996)
  • Windows 95 Service Pack 2 (August 24, 1996)
  • Windows 95 USB Supplement to Service Pack 2 (August 27, 1997)
  • Windows 95 Service Pack 2.1 (August 27, 1997)
  • Windows 95 Service Pack 2.5 (November 26, 1997)
 December 31, 2001
Windows 96 4.1 May 3, 1996 Cleveland, Nashville
  • Windows 96
  • Windows 96 Service Pack 1 (1997)
Windows 98 4.2 June 21, 1998 Memphis In winver, it says 4.10, like Windows 96. N/A July 11, 2006
Windows 99 4.2 April 23, 1999 98 SE Also known as Windows 98 Second Edition N/A
Windows Me 4.9 September 14, 2000 Millennium N/A
Windows NT
Windows NT 3.1 NT 3.1 July 27, 1993 AXP NT version of Windows 3.1
  • Windows NT 3.1 Workstation
 December 31, 2001
Windows NT for Workgroups 3.1 Razzle NT version of Windows for Workgroups 3.1 N/A
Windows NT 3.11 NT 3.11 January 24, 1994 NT OS/2 NT version of Windows 3.11.
  • Windows NT 3.11 Workstation
Windows NT for Workgroups 3.11 October 8, 1993 Razzle NT version of Windows for Workgroups 3.11. N/A
Windows NT 3.2 NT 3.2 1994 NT 3.2 NT version of Windows 3.2 or Chinese version of Windows NT 3.11.
  • Windows NT 3.2 Workstation
Windows 3.5 NT 3.5 September 21, 1994 Daytona
  • Windows 3.5 Workstation
Windows 3.51 NT 3.51 May 30, 1995
  • Windows 3.51 Workstation
Windows NT 4.0 NT 4.0 August 24, 1996 Shell Update Release
  • Windows NT 4.0 Workstation
 December 3, 2004
Windows NT 5.0 NT 5.0 February 17, 2000 Memphis, NT 5.0
  • Windows NT 5.0 Workstation
 July 13, 2010
Windows XP NT 5.1 October 25, 2001 Whistler
  • Windows XP Starter
  • Windows XP Home
  • Windows XP Professional
  • Windows XP 64-bit Edition
  • Windows Fundamentals for Legacy PCs (July 8, 2006)
 April 8, 2014
Windows XP Professional x64 Edition NT 5.2 April 25, 2005 N/A N/A
Windows Vista NT 6.0 January 30, 2007 Longhorn
  • Windows Vista Starter
  • Windows Vista Home Basic
  • Windows Vista Home Premium
  • Windows Vista Business
  • Windows Vista Enterprise
  • Windows Vista Ultimate
 April 11, 2017
Windows Vienna NT 6.1 December 12, 2008 Blackcomb, Vienna A beta version of Windows 7.
  • Windows Vienna Starter
  • Windows Vienna Home Basic
  • Windows Vienna Home Premium
  • Windows Vienna Business
  • Windows Vienna Enterprise
  • Windows Vienna Ultimate
 January 14, 2020
Windows 7 October 22, 2009 Seven
  • Windows 7 Starter
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Enterprise
  • Windows 7 Ultimate
  • Windows Thin PC
Windows 7.1 NT 6.11 February 22, 2011 7.1
  • Windows 7.1 Starter
  • Windows 7.1 Home Basic
  • Windows 7.1 Home Premium
  • Windows 7.1 Professional
  • Windows 7.1 Enterprise
  • Windows 7.1 Ultimate
  • Windows 7.1 Thin PC
Windows 8 NT 6.2 October 26, 2012 Jupiter, Eight
  • Windows 8
  • Windows 8 Professional
  • Windows 8 Home Edition
  • Windows 8 Enterprise
  • Windows 8 Core
  • Windows 8 OEM
 January 10, 2023
Windows 8.1 NT 6.3 October 17, 2013 Blue
  • Windows 8.1
  • Windows 8.1 Professional
  • Windows 8.1 Home Edition
  • Windows 8.1 Enterprise
  • Windows 8.1 Core
  • Windows 8.1 OEM
  • Windows 8.1 with Bing
Windows 10 NT 10.0 2015 Threshold
  • Windows 10 Home Edition
  • Windows 10 Professional
  • Windows 10 Professional Education
  • Windows 10 Professional for Workstations
  • Windows 10 Enterprise
  • Windows 10 Enterprise LTSC (formerly LTSB)
  • Windows 10 Education
  • Windows 10 IoT Core
  • Windows 10 IoT Enterprise
  • Windows 10 S (now an operational mode within Enterprise and Education)
 October 14, 2025
Windows 2020 2020 20H1 A successor to Windows 10 19H2. Not yet finished.
  • Windows 2020 Home
  • Windows 2020 Pro
  • Windows 2020 Pro Education
  • Windows 2020 Pro for Workstations
  • Windows 2020 Enterprise
  • Windows 2020 Enterprise LTSC
  • Windows 2020 Education
  • Windows 2020 IoT Core
  • Windows 2020 IoT Enterprise
  • Windows 2020 S
 Not yet released

Server versions

Name Version Release date Codename Additional information Editions Unsupported as of
Windows NT 3.1 NT 3.1 July 27, 1993 AXP NT version of Windows 3.1
  • Windows NT 3.1 Server
  • Windows NT 3.1 Advanced Server
 December 31, 2001
Windows NT 3.11 NT 3.11 1993 NT OS/2 NT version of Windows 3.11
  • Windows NT 3.11 Server
  • Windows NT 3.11 Advanced Server
Windows NT 3.2 NT 3.2 1994 NT 3.2 NT version of Windows 3.2 or Chinese version of Windows NT 3.11
  • Windows NT 3.2 Server
  • Windows NT 3.2 Advanced Server
Windows 3.5 NT 3.5 September 20, 1994 Daytona
  • Windows 3.5 Server
Windows 3.51 NT 3.51 May 29, 1995
  • Windows 3.51 Server
Windows NT 4.0 NT 4.0 July 29, 1996 Shell Update Release
  • Windows NT 4.0 Server
  • Windows NT 4.0 Enterprise Server
  • Windows NT 4.0 Terminal Server
 December 3, 2004
Windows Server 2000 NT 5.0 February 17, 2000 Memphis Server, Server 5 A server counterpart of Windows NT 5.0.
  • Windows Server 2000
  • Windows Advanced Server 2000
  • Windows Datacenter Server 2000
 July 13, 2010
Windows Server 2003 NT 5.2 April 24, 2003 Whistler Server A server counterpart of Windows XP.
  • Windows Standard Server 2003
  • Windows Enterprise Server 2003
  • Windows Datacenter Server 2003
  • Windows Web Server 2003
  • Windows Storage Server 2003
  • Windows Small Business Server 2003
 July 14, 2015
Windows Server 2003 R2 December 6, 2005 Whistler Server R2
  • Windows Standard Server 2003 R2
  • Windows Enterprise Server 2003 R2
  • Windows Datacenter Server 2003 R2
  • Windows Web Server 2003 R2
  • Windows Storage Server 2003 R2
  • Windows Small Business Server 2003 R2
  • Windows Compute Cluster Server 2003
  • Windows Home Server
Windows Server 2007 NT 6.0 December 8, 2006 Longhorn Server A server counterpart of Windows Vista.
  • Windows Standard Server 2007
  • Windows Enterprise Server 2007
  • Windows Datacenter Server 2007
  • Windows Server 2007 for Itanium-based Systems
  • Windows Foundation Server 2007
  • Windows Essential Business Server 2007
  • Windows HPC Server 2007
  • Windows Small Business Server 2007
  • Windows Storage Server 2007
  • Windows Web Server 2007
 April 11, 2017
Windows Server 2008 NT 6.1 February 27, 2008 Vienna Server A server counterpart of Windows Vienna.
  • Windows Standard Server 2008
  • Windows Enterprise Server 2008
  • Windows Datacenter Server 2008
  • Windows Server 2008 for Itanium-based Systems
  • Windows Foundation Server 2008
  • Windows Essential Business Server 2008
  • Windows HPC Server 2008
  • Windows Small Business Server 2008
  • Windows Storage Server 2008
  • Windows Web Server 2008
 January 14, 2020
Windows Server 2008 R2 October 22, 2009 Server 7
  • Windows Foundation Server 2008 R2
  • Windows Standard Server 2008 R2
  • Windows Enterprise Server 2008 R2
  • Windows Datacenter Server 2008 R2
  • Windows Server 2008 R2 for Itanium-based Systems
  • Windows Web Server 2008 R2
  • Windows Storage Server 2008 R2
  • Windows HPC Server 2008 R2
  • Windows Small Business Server 2010
  • Windows Home Server 2010
  • Windows MultiPoint Server 2010
Windows Server 2008 R3 NT 6.11 October 22, 2011 Server 7.1
  • Windows Foundation Server 2008 R3
  • Windows Standard Server 2008 R3
  • Windows Enterprise Server 2008 R3
  • Windows Datacenter Server 2008 R3
  • Windows Server 2008 R3 for Itanium-based Systems
  • Windows Web Server 2008 R3
  • Windows Storage Server 2008 R3
  • Windows HPC Server 2008 R3
  • Windows Small Business Server 2011
  • Windows MultiPoint Server 2011
  • Windows Home Server 2011
Windows Server 2012 NT 6.2 September 4, 2012 Server 8
  • Windows Foundation Server 2012
  • Windows Essentials Server 2012
  • Windows Standard Server 2012
  • Windows Datacenter Server 2012
  • Windows MultiPoint Server 2012
 October 10, 2023
Windows Server 2012 R2 NT 6.3 October 17, 2013 Server Blue, Server 8.1
  • Windows Foundation Server 2012 R2
  • Windows Essentials Server 2012 R2
  • Windows Standard Server 2012 R2
  • Windows Datacenter Server 2012 R2
  • Windows MultiPoint Server 2012 R2
Windows Server 2016 NT 10.0 October 12, 2016 Threshold Server
  • Windows Essentials Server 2016
  • Windows Standard Server 2016
  • Windows Datacenter Server 2016
 January 12, 2027
Windows Server 2019 November 13, 2018 Redstone Server
  • Windows Essentials Server 2019
  • Windows Standard Server 2019
  • Windows Datacenter Server 2019
 January 9, 2029
Windows Server 2020 2020 Server 20H1 A successor to Windows Server 19H2. Not yet finished.
  • Windows Essentials Server 2020
  • Windows Standard Server 2020
  • Windows Datacenter Server 2020

Device versions

Appliances

Name Version Release date An edition of Additional information Sold with
Windows XP Media Center Edition NT 5.1/NT 5.2 2001, 2002, 2003, 2004, 2005, and 2006 Windows XP Home theater PCs, network attached storage (NAS) and set-top boxes
Windows XP Tablet PC Edition NT 5.1/NT 5.2 November 2002, 2003, 2004, and 2005 Microsoft Tablet PC
Windows RT NT 6.2 October 26, 2012 Windows 8 ARM-based tablet computers
Windows RT 8.1 NT 6.3 October 18, 2013 Windows 8.1

Mobile devices

Mobile devices include smartphones, handheld tablet computers, and personal digital assistants

  • Windows 2020
    • Windows 2020 Mobile
    • Windows 2020 Mobile Enterprise
    • Windows 2020 IoT Mobile
    • Windows 2020 IoT Mobile Enterprise
  • Windows 10
    • Windows 10 Mobile
    • Windows 10 Mobile Enterprise
    • Windows 10 IoT Mobile
    • Windows 10 IoT Mobile Enterprise
  • Windows Phone
    • Windows Phone 8.1
    • Windows Phone 8
    • Windows Phone 7.8
    • Windows Phone 7.5
    • Windows Phone 7.1
    • Windows Phone 7
  • Windows Mobile
    • Windows Mobile 6.5
    • Windows Mobile 6.1
    • Windows Mobile 6.0
    • Windows Mobile 5.1
    • Windows Mobile 5.0
    • Windows Mobile 2003 Third Edition
    • Windows Mobile 2003 Second Edition
    • Windows Mobile 2003
    • Pocket PC 2002
    • Pocket PC 2001
    • Pocket PC 2000

Embedded devices

  • Windows Embedded
    • Windows Embedded 8.1
    • Windows Embedded 8
    • Windows Embedded 7.1
    • Windows Embedded 7
    • Windows Embedded Automotive
    • Windows Embedded Industry
    • Windows Embedded 2009
    • Windows XP Embedded
    • Windows NT 5.0 Embedded
    • Windows NT 4.0 Embedded – Abbreviated NTe, it is an edition of Windows NT 4.0 that was aimed at computer-powered major appliances, vending machines, ATMs and other devices that cannot be considered computers per se. It is the same system as the standard Windows NT 4.0, but it comes packaged in a database of components and dependencies, from which a developer can choose individual components to build customized setup CDs and hard disk boot images. Windows NT 4.0 Embedded includes Service Pack 5. Before 1998, it used to be called Windows NT 4.1.
  • Windows Embedded Compact
    • Windows Embedded Compact 2013
    • Windows Embedded Compact 7.1
    • Windows Embedded Compact 7
    • Windows Embedded CE 6.1 (2007)
    • Windows Embedded CE 6.0 (2006)
    • Windows CE 5.1 (2006), with a version for smartphones and PDAs sold as Windows Mobile 5.1
    • Windows CE 5.0 (2005), with a version for smartphones and PDAs sold as Windows Mobile 5.0
    • Windows CE 4.3 (2005), with a version for smartphones and PDAs sold as Windows Mobile 2003 TE
    • Windows CE 4.2 (2004), with a version for smartphones and PDAs sold as Windows Mobile 2003 SE
    • Windows CE 4.1 (2003), with a version for smartphones and PDAs sold as Windows Mobile 2003
    • Windows CE 4.0 (2002), with a version for smartphones and PDAs sold as Pocket PC 2002
    • Windows CE 3.1 (2001), with a version for smartphones and PDAs sold as Pocket PC 2001
    • Windows CE 3.0 (June 2000), with a version for smartphones and PDAs sold as Pocket PC 2000
    • Windows CE 2.13 (January 2000)
    • Windows CE 2.12 (August 1999)
    • Windows CE 2.11 (October 1998)
    • Windows CE 2.1 (July 1998)
    • Windows CE 2.0 (September 1997)
    • Windows CE 1.0 (November 1996)

Canceled versions

  • Microsoft Odyssey – a version intended to be an update to the Microsoft Windows NT 5.x codebase. The teams working on Neptune and Odyssey combined to work on Windows XP.
  • Windows Mobile 7 or Photon - originally a successor of Windows Mobile, it had been scrapped for Windows Phone 7 with Metro UI.
  • Microsoft Neptune (December 27, 1999) – the first planned version of Microsoft Windows NT to have a consumer edition variant, based on the Windows 2000 codebase. A version was sent out to testers but was never released.
  • Microsoft Triton (2001) – a planned successor to Microsoft Neptune.
  • Windows NT 4.1 (1997) – former name of Windows NT 4.0 Embedded.
  • Microsoft Cairo (February 29, 1996) – a "true object-oriented OS", planned after Windows NT 4.0.
  • Microsoft Midori (2003) – codename for a managed code operating system.
  • Windows 4.0 (1995) – former name of Windows 95.
  • Windows 4.1 (1996) – former name of Windows 96.
  • Windows 4.2 (1998) – former name of Windows 98.
  • Windows 4.9 (2000) – former name of Windows Me.
  • Windows 5 (1999) and Windows 2000 (1999) – former names of Windows NT 5.0.
  • Windows NT 5.0 Server (1999) and Windows 2000 Server (1999) - former names of Windows Server 2000.
  • Windows 2001 (2001), Windows 101 (2001), Windows 5.1 (2001), Windows NT XP (2001), and Windows NT 5.1 (2001) – former names of Windows XP.
  • Windows 6 (2006) – former name of Windows Vista.
  • Windows 8.2 (2014) and Windows 9 (2014) – former names of Windows 10. The last build of Windows 9 is 9883.
  • Windows 10 20H1 (2020) – former name of Windows 2020.
  • Windows Server 20H1 (2020) and Windows 2020 Server (2020) – former names of Windows Server 2020.
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