I spent most of my time working on Visual Studio (in the Boston time frame) so we got to interact with pretty much every team. I absolutely hated interacting with the Windows team. Everything was a fight for no reason.
As I said above, everyone has their own experiences but the QA folks I worked with at MS were fantastic.
Not sure if you're aware but Dave Plumber now has a really good YT channel [0] where he talks about MS back in those days. It's a fun walk down memory lane.