Simple:

1. Right-click Start button, choose Run
2. Type in the command below, but use your Microsoft Account email address instead of the example:
   
   runas /u:MicrosoftAccount\username@example.com winver
   
3. Provide your Microsoft Account password when prompted. After you press Enter, the “WinVer” program will launch, informing you about what version of Windows you have (you can close it, you’re done at this point).

That’s it.