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Yes from scratch. Names matter little.

From your source: "Microsoft's internal project name for the new OS was OS/2 NT, because Microsoft's intention was for the new OS to succeed OS/2 yet retain the OS/2 API as its primary interface."

Note how Russinovich talks about a "new OS".

The NT (kernel) never had any OS/2 code in it, it was a totally different project. The first target processor architecture for NT wasn't even x86, it was MIPS.

OS/2 in NT was merely a subsystem layer next to DOS and Posix, somewhat like today there is the Linux subsystem layer in Windows 10.

A good source is this:

https://www.amazon.com/Show-Stopper-Breakneck-Generation-Mic...




> The first target processor architecture for NT wasn't even x86, it was MIPS.

I thought it's pretty well established now that the NT in the name was named after the target architecture: Intel i860 "N10", not MIPS.


You're right. My point was, however, that it wasn't an x86.




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