Training: Get productive quickly with our Outlook Quick Start. Learn how to create and send email, and use @mentions to get someone's attention.

如果我的设备上没有管理员权限，该怎么办？ 若要完全升级到新的 Microsoft Edge，必须使用管理员帐户登录到设备。

Explore the new and refreshed apps of Windows 11, from Photos to Microsoft Store. Watch the video and read tips to find tools to stay creative and productive, whether on your phone or on your PC.

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 how to update your security processor or TPM firmware to protect Windows 10 and your device from attacks by malicious software.

Learn how to show hidden files, folders, and drives in Windows.

Learn how to sign into your Microsoft account at Microsoft365.com for working online from anywhere and using Microsoft365 on the web with the desktop apps.

How to access and change the privacy settings in Windows 10 and 11.

Warning: Excel provides the DATEDIF function in order to support older workbooks from Lotus 1-2-3.The DATEDIF function may calculate incorrect results under certain scenarios. Please see the known issues section of this article for further details.

Learn how to find a Windows product key for activation, and when you'll use a digital license instead.