Has anyone had this happen? I allowed an update to Windows 10 and Office 2016 several days ago and following that I was unable to login to my PC... my Windows userid was changed from my local login to my Microsoft account login. After ripping MS a new one, I was finally able to get in after resetting my MS account password. I know I did not change my account setting and no one else uses this laptop, so I can only assume this is a case of MS making unwelcome changes again.