Windows still is, it's just x86 and ARM took over everything. Although I think ACPI/UEFI is hooked into Windows so deeply it's required on ARM, though.
The ARM-based Surface laptop (the one that Steve Ballmer had to write off $900m worth of in the early 2010s) was running real Windows NT. I believe Microsoft's last smartphone efforts - the Windows Phone 8 or 10, was also running NT instead of CE.
The ARM-based Surface laptop (the one that Steve Ballmer had to write off $900m worth of in the early 2010s) was running real Windows NT. I believe Microsoft's last smartphone efforts - the Windows Phone 8 or 10, was also running NT instead of CE.