Two articles by Ed Bott explaining the Windows 10 License Terms and Support Life Cycle:
From
Windows lifecycle fact sheet:
[TABLE="class: table table4Col"]
[TR]
[TH="class: matS"]Client operating systems[/TH]
[TH="class: matS"] Latest update or service pack[/TH]
[TH="class: matS"] End of mainstream support[/TH]
[TH="class: matS"] End of extended support[/TH]
[/TR]
[TR]
[TD] Windows XP [/TD]
[TD]
Service Pack 3 [/TD]
[TD] April 14, 2009 [/TD]
[TD]
April 8, 2014 [/TD]
[/TR]
[TR]
[TD] Windows Vista [/TD]
[TD]
Service Pack 2 [/TD]
[TD] April 10, 2012 [/TD]
[TD] April 11, 2017 [/TD]
[/TR]
[TR]
[TD] Windows 7 * [/TD]
[TD]
Service Pack 1 [/TD]
[TD] January 13, 2015 [/TD]
[TD] January 14, 2020 [/TD]
[/TR]
[TR]
[TD] Windows 8 [/TD]
[TD]
Windows 8.1 [/TD]
[TD] January 9, 2018 [/TD]
[TD] January 10, 2023 [/TD]
[/TR]
[TR]
[TD] Windows 10, released in July 2015 ** [/TD]
[TD] N/A [/TD]
[TD] October 13, 2020 [/TD]
[TD] October 14, 2025 [/TD]
[/TR]
[/TABLE]
** Updates are cumulative, with each update built upon all of the updates that preceded it. A device needs to install the latest update to remain supported. Updates may include new features, fixes (security and/or non-security), or a combination of both. Not all features in an update will work on all devices. A device may not be able to receive updates if the device hardware is incompatible, lacking current drivers, or otherwise outside of the Original Equipment Manufacturer’s (“OEM”) support period. Update availability may vary, for example by country, region, network connectivity, mobile operator (e.g., for cellular-capable devices), or hardware capabilities (including, e.g., free disk space).