Linux 0.99 was released to the world with TCP/IP stack back in Sept 1992 whereas at the time Windows NT was still in the development since 3.1 version with the adopted Spider TCP/IP stack was only released in July 1993 [1],[2].
There's a time window (pun intended) between the public released of the Linux kernel with working TCP/IP and the official public released of Windows NT. If Microsoft wanted to adopt Linux TCP/IP (I doubt they wanted to do that since it's still at the time pre stable 1.0) theoretically they can because it will be just copy paste exercise as they most probably did with Spider TCP/IP stack. But what I am saying is that even if they wanted to it will be illegal because by the stroke of Linus' genius Linux kernel was relicensed to GPL in the exact same year 0.99 kernel was released.
I've checked but there is no references that mentioned of Build 297 of NT 3.1 released in 1992 come with any TCP/IP stack.
It seems TCP/IP stack was still under development at that time and was not included in this early beta build, and it was only released in 1993 stable release. Perhaps the more correct word is not 'development' but 'testing' since they ripped the TCP/IP stack out from Spider system and there's a very high probability that the Spider stack itself was part of BSD codes.
They licensed Spider Software's TCP/IP stack. And you have no knowledge that Spider leveraged BSD code. You're probably too young to remember, but there were many vendors making TCP/IP stacks back in those days. Some based on pre-existing stacks, others from the ground up.
I'm unsure as to why you're making unsubstantiated claims and sticking with them. You have zero proof that the claims you're making are true. I'd love to have the source for Spider's TCP or at least have a contact that worked on the stack to ask, it's interesting history. I don't care one way or another, it was a very temporary stack that didn't make it into 3.5 where the entire stack architecture changed (no longer based on SysV STREAMS).
> Linux wasn't a thing by the time NT was in development
So your statement provided here is wrong and misleading then?
According to this book NT development took five years to complete and reached stable 1.0 version by 1993 [1].
When Linux was in version 0.99 it has had a working implementation of TCP/IP by 1992 then in the very same year Linus relicensed Linux to GPL, and all these happened during NT development, wasn't it?
[1] Showstopper: The Breakneck Race to Create Windows NT and Next Generation at Microsoft:
Linux 0.99 was released to the world with TCP/IP stack back in Sept 1992 whereas at the time Windows NT was still in the development since 3.1 version with the adopted Spider TCP/IP stack was only released in July 1993 [1],[2].
There's a time window (pun intended) between the public released of the Linux kernel with working TCP/IP and the official public released of Windows NT. If Microsoft wanted to adopt Linux TCP/IP (I doubt they wanted to do that since it's still at the time pre stable 1.0) theoretically they can because it will be just copy paste exercise as they most probably did with Spider TCP/IP stack. But what I am saying is that even if they wanted to it will be illegal because by the stroke of Linus' genius Linux kernel was relicensed to GPL in the exact same year 0.99 kernel was released.
[1] Linux kernel version history:
https://en.wikipedia.org/wiki/Linux_kernel_version_history
[2] Windows NT:
https://en.wikipedia.org/wiki/Windows_NT