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。

Learn how to restore files that have been permanently deleted and are no longer in the recycle bin on Windows 10.

Find answers to frequently asked questions about Office 2021 and Office LTSC for Windows and Mac on the official support page.

Find answers to top questions about upgrading to Windows 11, from the minimum hardware requirements to where to find the upgrade.

How to use a PivotTable in Excel to calculate, summarize, and analyze your worksheet data to see hidden patterns and trends.

Use VLOOKUP, HLOOKUP, and other functions like INDEX and MATCH to search for and find data based on values you enter. This article gives you a quick VLOOKUP refresher, then links to more.

Learn how to open and run DxDiag.exe on Windows to collect device information and troubleshoot DirectX sound and video issues.

Master the art of Excel formulas with our comprehensive guide. Learn how to perform calculations, manipulate cell contents, and test conditions with ease.

Windows 10、Windows 8.1、および Windows 7 用の Windows Media Player 12 の入手方法について説明します。

Learn what you can do if you're not receiving account aign-in verification codes.