Just happened to my boss at work today. Windows locked him out and will NOT let me reset his password or PIN. Even trying to unlock it with his Microsoft account (following the instructions on the login screen), filling out EVERY FIELD on the provided form and waiting for a response only got Microsoft to say I didn't provide enough info and lock me back out. Guess we'll be reinstalling the OS on this two month old machine at work and getting rid of Windows myself as soon as I feasibly can.
Edit: Fricken' pathetic how long this has been an issue for users.