Learn how you can use the free Microsoft Authenticator app to sign in to all your accounts without using a password.

The Microsoft Authenticator app helps you sign into your accounts when you're using two-step verification.

Learn how to redeem prepaid codes for Xbox games, subscriptions, or downloadable content using your account.

Need help setting up an XBOX profile or signing in to XBOX on your console, PC, or mobile device? This solution will help you sign in or create a new account.

Answers to questions on finding, getting, and applying product keys.

Learn how to manage your Microsoft account security info and troubleshoot verification code issues.

If your purchase of Office or Microsoft 365 came with a product key, you enter your product key on one of the websites listed below for your product. After you enter your key, you can download and install Office, or you can renew your Microsoft 365 subscription. Having problems with your product key?

See how to install Project 2013 and 2016 and Project Pro for Office 365.

If you see a message that says "Let's protect your account" or "Help us secure your account", it's because we need you to add some information to your account to verify that it's really you trying to sign in. We will ask for an email address or phone number that we can send a verification code to. It doesn't have to be your email or phone number - you just need to be able to access it to ...

Learn how to activate Windows using a product key or digital license, check your activation status, and link your Microsoft account.