> XENIX, which was Microsoft's clone of V7 UNIX no, not a clone, xenix was licensed unix v7, licensed from AT&T. They did not have a license to use the tradema

> XENIX, which was Microsoft's clone of V7 UNIX no, not a clone, xenix was licensed unix v7, licensed from AT&T. They did not have a license to use the trademark unix, so they called their version xenix. unix was already widely available when Linus started tinkering, he wanted to play with source, and BSD's were still tangled up in copyright. Had closed source Windows been based on unix, linux's open source hegemony would have toppled Windows too