"The lifetime of the device" said Microsoft. Which, frankly, meant nothing to anyone. A PowerPoint presentation buried on Microsoft's site suggested that Window 10 users would get free upgrades only in the first 2 to 4 years. Which is hardly any time at all. Thankfully, that turns out not have been true, as today -- at long last -- Microsoft has updated its Windows lifecycle fact sheet.
According to the new information, Mainstream support starts on July 29 2015 (launch day) and runs until October 13 2020. After then Windows 10 will enter the Extended support phase for five years. This ends on October 14 2025. So in total Microsoft will be supporting Windows 10 for at least ten years. This is the same lifecycle that’s been used with previous versions of Windows.
There’s some small print to go with this, however:
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). Full Article