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The term Windows NT was used to distinguish Microsoft's line of business-orientated operating systems from their consumer-orientated versions. The numbering system effectively started from Windows for Workgroups 3.1, with the first Windows NT release being Windows NT 3.1. Windows NT 3.5, Windows NT 3.51 and Windows NT 4.0 would be the only other operating system releases to bear the Windows NT branding (although the beta for Windows 2000 began as Windows NT 5.0).
This is a summary of where Microsoft products ended up on the Windows NT versioning system:
| Version | Products | Editions | Release Date |
|---|---|---|---|
| 3.1 | Windows NT 3.1 | Workstation, Server | July 27, 1993 |
| 3.5 | Windows NT 3.5 | Workstation, Server | September 21, 1994 |
| 3.51 | Windows NT 3.51 | Workstation, Server | May 30, 1995 |
| 4.0 | Windows NT 4.0 | Workstation, Server, Server Enterprise Edition, Terminal Server, Embedded | August 24, 1996 |
| 5.0 | Windows 2000 | Professional, Server, Advanced Server | February 17, 2000 |
| Datacenter Server | September 26, 2000 | ||
| 5.1 | Windows XP | Home Edition, Professional Edition, Media Center Edition, Media Center Edition 2004, , Media Center Edition 2005, Tablet PC Edition, Tablet PC Edition 2005, Starter Edition, Embedded, Home Edition N, Professional Edition N | October 25, 2001 |
| Windows Fundamentals for Legacy PCs | July 8, 2006 | ||
| 5.1 | Windows XP | Windows XP 64-bit Edition 2003 | March 28, 2003 |
| Windows Server 2003 | Standard Edition, Enterprise Edition, Datacenter Edition, Web Edition, Storage Server, Small Business Server, Compute Cluster Server | April 24, 2003 | |
| Windows XP | Windows XP Professional x64 Edition | April 25, 2005 | |
| Windows Server 2003 R2 | Standard Edition, Enterprise Edition, Datacenter Edition, Web Edition, Storage Server, Small Business Server, Compute Cluster Server | December 6, 2005 | |
| Windows Home Server | July 16, 2007 | ||
| 6.0 | Windows Vista | Business Edition, Enterprise Edition | November 30, 2006 |
| Windows Vista | Starter Edition, Home Basic Edition, Home Premium Edition, Ultimate Edition | January 30, 2007 | |
| Windows Server 2008 | Foundation Edition, Standard Edition, Enterprise Edition, Datacenter Edition, Web Server Edition, HPC Server Edition, Itanium-Based Systems | February 27, 2008 | |
| 6.1 | Windows 7 | Starter Edition, Home Basic Edition, Home Premium Edition, Business Edition, Enterprise Edition, Ultimate Edition | October 22, 2009 |
| Windows Server 2008 R2 | Foundation Edition, Standard Edition, Enterprise Edition, Datacenter Edition, Web Server Edition, HPC Server Edition, Itanium-Based Systems | ||
| Windows Home Server 2011 | April 6, 2011 | ||
| Windows Thin PC | June 6, 2011 | ||
| 6.2 | Windows 8 | Windows 8, Windows 8 Pro, Windows 8 Enterprise, Windows RT | October 26, 2012 |
| Windows Server 2012 | Foundation Edition, Essentials Edition, Standard Edition, Datacenter Edition | September 4, 2012 | |
| 6.3 | Windows 8.1 | Windows 8.1, Windows 8.1 Pro, Windows 8.1 Enterprise, Windows RT 8.1 | October 18, 2013 |
| Windows Server 2012 R2 | Foundation Edition, Essentials Edition, Standard Edition, Datacenter Edition | ||
| 10.0 | Windows 10 | Home Single Language, Home, Pro, Pro Education, Pro for Workstations, Enterprise, Education, S, IoT Core, Mobile, Mobile Enterprise | July 29, 2015 |
| Windows Server 2016 | Essentials, Standard, Datacenter, Multipoint Premium Server, Storage Server, Hyper-V Server | September 26, 2016 | |
| Windows Server 2019 | Essentials, Standard, Datacenter, Multipoint Premium Server, Hyper-V Server | October 2, 2018 | |
| Windows 11 | Home Single Language, Home N, Home, Education, Education N, Pro, Pro N, Pro Education, Pro Education N, Pro for Workstations, Pro N for Workstations, SE, Enterprise, Enterprise multi-session, IoT Enterprise, IoT Enterprise LTSC | October 5, 2021 |