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Windows included (and may still include) parts of BSD. The IPV4 networking code, and some utilities like ftp.exe and rcp.exe, came from BSD.

This is no longer true, as the IP stack was rewritten in Vista.

http://technet.microsoft.com/en-us/network/bb545475.aspx

Did the old IP stack have any MIT licensed software, or was it all BSD?

I think it was only partially BSD, but I don't have any documentation at hand.

There might be a reference to it on Windows Internals series.

Microsoft's DNS server was forked from BIND 4, Merchant Server was an acqusition that run on Python in it's first incarnation and as dalke mentions various networking infrastructure came from the BSDs.

The Wikipedia article on Microsoft's DNS server states that bind 4 was not used, and that the Microsoft's DNS server was fully written by Microsoft. Sadly, it doesn't have a source, so it kind of leaves the question open.

It was most definitely written in house. Not terrible pretty code either.

This comment may be relevant to MIT vs. LGPL discussion: https://github.com/zeromq/netmq/issues/96