Learn how to check for, download, and install KB 2919355, an update for Windows 8.1 and Windows RT 8.1.

Get troubleshooting tips if you run into problems downloading, installing, or updating Microsoft Edge.

Learn how to use Feedback Hub to report problems or send suggestions to Microsoft.

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

A Microsoft account is a personal account required for access to Microsoft’s products and services.

Learn more about what background apps are in Windows and how to turn them off when you're not using them.

Discover the latest updates for Windows 10, including improvements and fixes, known issues, and guidance on how to get the update.

If your camera is unable to capture the QR code, you can manually add your account information to the Microsoft Authenticator app for two-factor verification.

如果尝试登录到帐户，但收到一条消息，表示该帐户被锁定，则这是因为与该帐户关联的活动可能违反了我们的使用条款。. 如何解锁 Microsoft 帐户

Learn more about updates for Windows 10 version 1903, including improvement and fixes, any known issues, and how to get the update.