An array formula (one that spans multiple cells) can do calculations on rows and columns of cells where you might otherwise need to use several formulas. For example, you can count the number of characters that are contained in a range of cells, sum only numbers that meet certain conditions (such as the lowest values in a range or numbers that fall between an upper and lower boundary), and sum ...

Use the XLOOKUP function when you need to find things in a table or a range by row. For example, look up the price of an automotive part by the part number, or find an employee name based on their employee ID. With XLOOKUP, you can look in one column for a search term, and return a result from the same row in another column, regardless of which side the return column is on.

Use Remote Desktop on your Windows, Android, or iOS device to connect to a Windows 10 PC from afar. Here's how to set up your PC to allow remote connections and then connect to the PC you set up.

Get help with signing in, changing passwords, creating and sending mail, deleting mail, creating folders, and more in Outlook on the web.

Find out how to connect your Xbox Wireless Controller to a Windows device.

下面是在 Windows 10 中打开注册表编辑器的两种方法： 在任务栏上的搜索框中，键入regedit，然后选择"注册表编辑器 (桌面应用) 结果。

Download printer drivers. If your printer isn't responding, you may need to remove it and reinstall it so Windows can download and install the proper drivers.

检查你的版本. DirectX 是许多 Windows 游戏都需要的一种多媒体技术套件。 如果你的电脑未安装正确版本的 DirectX（产品包装盒上应标有所需的版本），游戏可能无法正常运行。

The Inbox Repair tool doesn't connect or analyze any data stored in an Exchange mailbox. The tool only looks for errors (corruption), and if there are any, gives you the opportunity to allow the tool to fix those errors. If you can't start the Inbox Repair tool, you should try to repair your Outlook program.

Learn how to install the latest version of DirectX to enable games and multimedia applications on your system.