Detailed information about downloading and using Microsoft Authenticator in China. The Microsoft Authenticator app helps you sign into your accounts when you're using two-step verification.

The easiest way to find which Surface model you have is to use the Surface app. It shows the model name of your Surface device and each Surface accessory. Note: When signed in to the Surface app, you can see information for other Surface devices that you've also signed in to. Open the Surface app.

You can wirelessly connect your PC to a TV, projector, or other kind of external display that supports Miracast. Turn on your TV, projector, or other display. If you're using a Miracast dongle or adapter, make sure it's plugged in to the display.

This article explains how you can get or create a digital signature for use in Office documents. To learn more about how to use them in Office documents, see Add or remove a digital signature in Office files.

How to redeem a code in the Microsoft Store on Windows. Press the Start button , and then enter store into the search bar. Select your account in the top-right corner of the screen, and then select Redeem code or gift cards. Enter the 25-character code, select Next, and then follow the prompts.

Sign in to your work or school account and then go to your My Account portal. Select Security info in the left menu or by using the link in the Security info pane. If you have already registered, you'll be prompted for two-factor verification. Then, select Add method in the Security info pane.

Learn how to redeem a gift card, code, or Office product key and spend your balance at Microsoft Store online, on Windows, or Xbox.

Sign in using Microsoft Authenticator. Microsoft Authenticator helps you sign in to your accounts if you've forgotten your password, use two-step verification or multi-factor authentication, or have gone passwordless on your account.

For technical support, go to Contact Microsoft Support, enter your problem and select Get Help. If you still need help, select Contact Support to be routed to the best support option. Learn how to manage your Microsoft account security info and troubleshoot verification code issues.

Change or reset your Windows password. Accessing the account of someone who has died. Learn how to reset or change your Microsoft account password. Get help with a forgotten Microsoft account password.