It is built on the NT hybrid kernel, which was originally intended for use in OS/2 3.0 but was adapted for a 32-bit version of Windows after the Microsoft - IBM split. The first release based on the new kernel was Windows NT 3.1, which was launched in 1993 and was equivalent to Windows 3.1 released two years earlier.

Windows RT end | Windows Never Released Wikia | Fandom Windows Rt end was made 13 ACE it was last RAYSOFT os Surface RT update history - support.microsoft®.com In preparation for the release of Windows RT 8.1, no additional updates were released for Surface RT running Windows RT. August 2013 updates. Windows RT 8.0 updates only: UEFI firmware update enhances the audio experience at low volumes and removes a perceived pulsing in … Windows RT – Vikipeedia

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It is built on the NT hybrid kernel, which was originally intended for use in OS/2 3.0 but was adapted for a 32-bit version of Windows after the Microsoft - IBM split. The first release based on the new kernel was Windows NT 3.1, which was launched in 1993 and was equivalent to Windows 3.1 released two years earlier.

Windows 8.1 RT Update 3 - support.microsoft®.com