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Learn how to install, reinstall, or activate Microsoft 365 or Office 2019 on a PC or Mac.

How to use the SUMIF function in Excel to add the values in a range that meet criteria that you specify.

Microsoft Edge makes it easy to save your passwords as you browse the web. When you enter a new password in the Edge browser on your desktop or mobile device, Microsoft Edge will ask if you want your username and password remembered.

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.

Find out how to change the color of the Start menu, taskbar, and action center with dark and custom mode personalization settings.

Learn how to uninstall a Windows update, if for example that update is causing your system to have errors or other problems.

了解如何使用 PIN、面部识别或指纹通过 Windows Hello 登录电脑。 Windows Hello 是登录到 Windows 设备的一种更个性化、更安全的方式。 在 Windows Hello 中，你可以使用面部识别、指纹或 PIN 登录，而不是使用密码。

隐藏或卸载 OneDrive 在某些版本的 Windows 中，还可隐藏或卸载 OneDrive。 也可从 Android 和 iOS 设备卸载 OneDrive 移动应用。

Learn how to activate Office pre-installed on new Windows 10 PCs or with a new product key.