@yaeunerd Sure.

In simple words: #Microsoft lost one of their master keys to unlock very important parts of their cloud. This connects to all MS services that do authenticate by MS which includes most #Windows setups as well.

This happened long time ago, some people think it was the Chinese.

They were able to implant #backdoors, self-made keys, ... all over the place.

In order to fix that, MS would need to kill all their connected hosts and start from scratch. It's obvious why they don't.