The next version of Windows 10 will support password-free Microsoft accounts. Microsoft will only write a code to your phone number when you sign in. It's part of Microsoft's stated goal: "a world without password."
This feature is available now in Insider build 1
How it works: You can now create a Microsoft account without a password. Instead, just give your phone number. When you log on to Windows 10 with that phone number, Microsoft will write a code you enter on the login screen. Then you can use Windows Hello to configure a PIN, fingerprint or face logging method. You never have to enter a password – your account doesn't even have it! And you don't have to enter a code that is sent via text every time you log in, either. You only need to receive a code on the phone when you log on to a new PC.
To use this feature on the latest Insider Buildings of Windows, you need a Microsoft account without password:
If you do not already have a passwordless phone number account, you can create one in one mobile app like Word on your iOS or Android device to try it. Just go to Word and register with your phone number by entering your phone number under "Login or Register for Free".
This latest building also has a streamlined PIN reset experience for Windows Hi and narrator enhancements.  RELATED: Windows 10's next update will make your computer faster, thanks to better customization
Credit: KC Lemson / Microsoft, Microsoft