Based on what Microsoft themselves said we know: everything will be stored (except edge private session...). They specifically say they don't do content moderation: they log everything.
Did you read the article?
Q. Cool, so hackers and malware can’t access it, right?
A. No, they can.
Q. But it’s encrypted.
A. When you’re logged into a PC and run software, things are decrypted for you. Encryption at rest only helps if somebody comes to your house and physically steals your laptop — that isn’t what criminal hackers do.
As a windows user I'm not delighted by this.
Edit: at this point you must be trolling...
I was going to post this video. I highly recommend it (and don't stop at its title, it covers a large amount of subjects).