Use data validation rules to control the type of data or the values that users enter into a cell. One example of validation is a drop-down list (also called a drop-down box or drop-down menu). Watch more in this video.

Learn how to get Windows Media Player 12 for Windows 10, Windows 8.1, and Windows 7.

If your Outlook.com account has been blocked, follow the instructions in this article to unblock it.

Add or subtract days, months, or years from a date by using a formula or date functions in Excel.

Learn how to use command-line switches to customize the startup process for Word, Excel, PowerPoint, Outlook, and Access. Find examples and troubleshooting tips.

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。

We recommend always having the latest version of Windows installed to make sure you get the best experience with the Phone Link .

Try these troubleshooting steps if Microsoft Store does not launch in Windows 10.

Learn how to join a Microsoft Teams meeting if you don't have an account. Join a Teams meeting as a guest in the Windows app or on the web.

Splits text strings by using column and row delimiters. The TEXTSPLIT function works the same as the Text-to-Columns wizard, but in formula form.It allows you to split across columns or down by rows.