Learn how to troubleshoot Windows activation errors. Browse common activation errors and learn what you can do to fix them.

System requirements and setup steps for the Phone Link app

Learn why it's important to have a backup, and how Windows Backup can help you keep your files and settings safe.

Learn how to troubleshoot when the camera is not working in Windows or you see errors 0xA00F4244 or 0x200F4244.

Discover the latest features in Office 2021, including new ways to create content, manage data, and communicate effectively.

Learn how to download, install, and configure additional language packs for your version of Windows.

Learn how to run Windows Update Troubleshooter to resolve errors downloading or installing Windows updates.

了解如何使用产品密钥或数字许可证激活 Windows、检查激活状态，以及链接Microsoft 帐户。

Learn about what effect closing a Microsoft account might have on your other apps and services.

Microsoft's products and services work best if you use the same language and region across all your devices, and in all of your app and Store settings.