The Authenticator app generates security codes you can use to help keep your Microsoft account secure. You can add your Microsoft account to the app by scanning a barcode or by manually entering a secret key. The app implements industry-standard security code generation and may also work with other services and providers. You can learn more about keeping your Microsoft account secure at https://account.live.com/p. ** The Authenticator app is not supported for use with Windows Azure Multi-Factor Authentication. Use the Mutli Factor Authentication app for this.