I remember that back in the mid 80s the Application group was not happy about the quality of work so someone circulated a memo about software quality, which I read from Steven Sinorfsky’s blogs. Adding NT on top of it, I’d say they definitely treat software quality a lot more serious than today.

I think they completely let it go when they laid off the testers and let users pay $$ to be testers, starting from 2010s perhaps. Maybe earlier.