Which method is NOT commonly used to sign in to a Microsoft Windows computer?

Voice recognition is not commonly used as a primary method for signing in to a Microsoft Windows computer. While Windows supports voice recognition technology, it is primarily utilized for dictation, accessibility, and specific commands rather than as a standard sign-in option.

On the other hand, signing in using a PIN is an increasingly popular choice as it provides a quick and secure method for access while leveraging the convenience of numeric inputs. Passwords remain the traditional and widely recognized method of securing user accounts, offering a layer of security by requiring a string of characters known only to the user. Fingerprint authentication is also a common sign-in method, especially with the rise of biometric technologies, providing a fast and secure means of access by using an individual's unique fingerprint.

Overall, while voice recognition has its applications, it hasn't been adopted as a standard sign-in method in the same way that PINs, passwords, and fingerprints have.