Skunk Worx:
MS Windows 1.0 (Wikipedia) November 1995.
Kelly:
Don't you mean 1985? IIRC, Windows 3.1 was out in 1992...
Even then, they were still pipped at the post by other OSs long before then for GUI systems, networking, file systems, etc. There's only one thing I'd accept Microsoft patenting - their blue screen of death (which always sounds like an Doctor Who story title from the Tom Baker era, to me). ;-)