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Windows 10 version history
Windows 10 is a major release of the Windows NT operating system developed by Microsoft. Microsoft described Windows 10 as an "operating system as a service" that would receive ongoing updates to its features and functionality, augmented with the ability for enterprise environments to receive non-critical updates at a slower pace or use long-term support milestones that will only receive critical updates, such as security patches, over their five-year lifespan of mainstream support. It was released in July 2015.
Windows 10 Insider Preview builds are delivered to Insiders in three different channels (previously "rings"). Insiders in the Dev Channel (previously Fast ring) receive updates prior to those in the Beta Channel (previously Slow ring), but might experience more bugs and other issues. Insiders in the Release Preview Channel (previously Release Preview ring) do not receive updates until the version is almost available to the public, but are comparatively more stable.
Mainstream builds of Windows 10 are labeled "YYMM", with YY representing the two-digit year and MM representing the month of planned release (for example, version 1507 refers to builds which initially released in July 2015). Starting with version 20H2, Windows 10 release nomenclature changed from the year and month pattern to a year and half-year pattern (YYH1, YYH2).
The original version of Windows 10 (also retroactively named version 1507 and codenamed "Threshold 1") was released in July 2015. It carries the build number 10.0.10240; while Microsoft has stated that there was no designated release to manufacturing (RTM) build of Windows 10, build 10240 was described as an RTM build by various media outlets. It was retroactively named "version 1507" by Microsoft per its naming conventions that have the last 2 digits of the year and the month number for future stable releases of the operating system.
Notable changes in this version include:
The final release was made available to Windows Insiders on July 15, 2015, followed by a public release on July 29, 2015.
The update has reached end of service on May 9, 2017 in the Current Branch and Current Branch for Business. The Enterprise LTSB edition has reached end of service on October 14, 2025.
The second stable build of Windows 10 is version 1511 (build number 10586), known as the November Update. It was codenamed "Threshold 2" (TH2) during development. This version was distributed via Windows Update on November 12, 2015. It contains various improvements to the operating system, its user interface, bundled services, as well as the introduction of Skype-based universal messaging apps, and the Windows Store for Business and Windows Update for Business features.
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Windows 10 version history
Windows 10 is a major release of the Windows NT operating system developed by Microsoft. Microsoft described Windows 10 as an "operating system as a service" that would receive ongoing updates to its features and functionality, augmented with the ability for enterprise environments to receive non-critical updates at a slower pace or use long-term support milestones that will only receive critical updates, such as security patches, over their five-year lifespan of mainstream support. It was released in July 2015.
Windows 10 Insider Preview builds are delivered to Insiders in three different channels (previously "rings"). Insiders in the Dev Channel (previously Fast ring) receive updates prior to those in the Beta Channel (previously Slow ring), but might experience more bugs and other issues. Insiders in the Release Preview Channel (previously Release Preview ring) do not receive updates until the version is almost available to the public, but are comparatively more stable.
Mainstream builds of Windows 10 are labeled "YYMM", with YY representing the two-digit year and MM representing the month of planned release (for example, version 1507 refers to builds which initially released in July 2015). Starting with version 20H2, Windows 10 release nomenclature changed from the year and month pattern to a year and half-year pattern (YYH1, YYH2).
The original version of Windows 10 (also retroactively named version 1507 and codenamed "Threshold 1") was released in July 2015. It carries the build number 10.0.10240; while Microsoft has stated that there was no designated release to manufacturing (RTM) build of Windows 10, build 10240 was described as an RTM build by various media outlets. It was retroactively named "version 1507" by Microsoft per its naming conventions that have the last 2 digits of the year and the month number for future stable releases of the operating system.
Notable changes in this version include:
The final release was made available to Windows Insiders on July 15, 2015, followed by a public release on July 29, 2015.
The update has reached end of service on May 9, 2017 in the Current Branch and Current Branch for Business. The Enterprise LTSB edition has reached end of service on October 14, 2025.
The second stable build of Windows 10 is version 1511 (build number 10586), known as the November Update. It was codenamed "Threshold 2" (TH2) during development. This version was distributed via Windows Update on November 12, 2015. It contains various improvements to the operating system, its user interface, bundled services, as well as the introduction of Skype-based universal messaging apps, and the Windows Store for Business and Windows Update for Business features.