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.

Learn how to troubleshoot and fix problems setting up your email in Outlook.

Windows Hello. Windows Hello 可使你通过你的面部、虹膜、指纹或 PIN 登录到你的设备、应用、在线服务和网络。 即使你的 Windows 设备可以使用 Windows Hello 生物识别，也不必这么做。

Learn how to add an app to run automatically at startup. Select the Start button and scroll to find the app you want to run at startup.

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

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Learn how to use OneDrive Files On-Demand to sync your OneDrive files and save disk space in Windows 10.

Learn how to delete and restore files in OneDrive. Recover deleted files or folders from the OneDrive recycle bin.

Training: Watch and learn how to use PowerPoint in Windows. Explore PowerPoint training guides, articles, and how-to videos.

Learn how to install Windows 7 Service Pack 1 (SP1). Includes info about how to get the download, requirements, and more.