Windows Security is pre-installed on Windows 10 and ready for you to use at any time.

Learn how to change the power mode on your Windows PC to preserve your battery, limit notifications, and background activity.

Learn how to manage background activity for apps to help save battery power in Windows.

You can refer to the contents of cells in another workbook by creating an external reference formula. An external reference (also called a link) is a reference to a cell or range on a worksheet in another Excel workbook, or a reference to a defined name in another workbook.

Find help and support content for Microsoft Phone Link. Learn time-saving tips and explore how you can use Phone Link to stay productive.

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

Make the everyday easier with Windows 11. When there's a lot to do, Windows 11 helps you get it done. With intuitive navigation and new multitasking tools, it brings you the performance you want and the security you need.

学习如何在 Windows 中解决 USB-C 问题，修复 USB 设备、端口和适配器无法正常工作。

Find out how to set up and manage your security info and verification codes for your Microsoft account, and troubleshoot common issues.

See how to arrange all your open windows using the mouse, keyboard, or the Snap Assist feature in Windows.