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

Learn how to access Windows device security settings in Windows Security to help protect your device from malicious software.

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

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。

Updates to the default screen and sleep settings now help you use energy more efficiently and extend battery life. You can find efficiency settings in Windows 11 at Settings > System > Power & battery.. For a guided walkthrough of how each of the power and battery settings can improve your device's performance, click the button to open the Get Help app:

Learn how to reinstall Windows on your PC and how activation works after it's installed.

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

Learn how to turn on device encryption, or standard BitLocker encryption in Windows.

Summary. Microsoft Update Health Tools is offered to devices through Windows Update as update KB4023057. This update is applicable for both Windows consumer and commercial devices, with a slightly different purpose and functionality.

If you already have an account signed in to OneDrive and you want to add or remove another account, you’ll do that in OneDrive Settings.