The software giant said Windows RT users will continue to receive some unspecified feature updates in the future but they won't be getting an update to Windows 10.
The non-adoption of Windows RT was a perfect storm of poor decisions at multiple levels of Microsoft. The Tegra 3 SoC that powered the first generation Surface RT didn’t pack enough horsepower to really drive a top-tier tablet experience. Microsoft did a miserable job communicating the differences between Windows RT and traditional x86 Windows, tales spun of consumers taking the hardware home, firing it up, and then returning it when they realized they couldn’t run desktop applications.Source: ExtremeTech
In retrospect, Microsoft’s decision to retain the desktop for Windows RT was a huge mistake. While it’s true that the desktop offered certain functions that the nascent Metro design wasn’t ready to replace on launch day, the sight of familiar icons and desktop interfaces primed consumers to expect the same degree of software compatibility and flexibility. Stripped of those features, Windows RT lost much of its appeal.