>>25695Microsoft is the sole developer and vendor of their proprietary software. Open-source and shareware developers usually disclaim warranty from anything they release, so they can prevent, with the minimum possible effort, some hypothetical company from doing something stupid with it, like using it in a safety critical system without proper expertise, and busting a lawyer on their asses for it.
I'm unsure why Apple doesn't have it. Maybe it's because OSX incorporates some open-source software in their releases or they can just get away with it. Windows definitely needs some kind of warranty though, because the base-system for home desktop-use and commercial installations has been mostly the same since XP. I'm pretty any license for one of the commercial Unixen, like Solaris, QNX, AIX and HP-UX, would come with an appropriate warranty.