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 ...

Play music and video in more formats and stream it to more places with Windows Media Player 12.

Learn how to type a letter online using Word for the web. Choose a letter template for online letter writing. Edit, send or print your letter online.

Learn how to access Windows device security settings in Windows Security to help protect your device from malicious software.

This article explains how to zip and unzip files.

How to send automatic out-of-office replies from Outlook (depending on the type of email account you have).

Find everything you need to manage your Xbox account, profile, and more.

How to set up Xbox Cloud Gaming on a Steam Deck device using the Microsoft Edge browser.

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。

This article describes how to change keyboard layouts in Windows 7 and earlier versions of Windows.