Microsoft owned Bungie when they named their assistant Cortana.
Microsoft acquired Bungie in 2000 and released the Cortana assistant in 2014. It wasn't a stolen name. It was purchased and part of their portfolio for over a decade.
Halo had nothing to do with windows. They literally looted that character, maybe ‘legally’ yes but that doesn’t do anything to finish the ‘theft’ of them taking a character developed by a game studio, and using their likeness in an utterly unrelated context as some sort of cringey tie-in.