Windows 10 Signin changed to Microsoft from local

[PaulSp]

I woke my computer from sleep this morning and it said it now wanted me to login using my Microsoft account. I had set it to use my local account sans password. I noticed that a couple of updates had been installed (must have been automatic... don't remember downloading them). So what the heck is going on here. I was able to log in to my microsoft account then switch back to local login again, but wondering why this happened.

 

[ussnorway]

Microsoft took control of your system to download updates

 

[davehc]

You could be correct, but imho, I don't think the MS server would know you needed updates until the machine was logged in?
As Ms are now only sending UUps, it is necessary for them to have access so that they can se what is needed. Mybe (?) they can do this instantly from the registration at the boot stage - no idea on that.