Earlier quoted context omitted.
> That said, I've always seen the original Xbox as the spiritual successor to the Dreamcast. In what sense? The architecture between these two consoles is IMHO quite different.
But it really was. Sega and Microsoft worked closely together or why do you think they implented the Windows CE option? Also all Sega arcades afterwards shipped with Xbox hardware.
> https://en.wikipedia.org/w/index.php?title=Windows_Embedded_...
"Unlike Windows Embedded Standard, which is based on Windows NT, Windows Embedded Compact uses a different hybrid kernel."
I am also pretty sure that Windows CE's architecture is quite different from the OS running on the XBox, but cannot give a quotable source on this. At least for the Xbox 360 and XBox One, I am pretty sure that I have read that their kernel is actually not so dissimilar from the kernel used in the NT line. The difference between the Windows NT line and the XBox 360/One OS rather lies in the software running above the kernel.