在 Excel 中，IF 函数允许通过测试某个条件并返回结果（如果该条件为 True 或 False），在值和预期值之间进行逻辑比较。

These steps can help resolve the most common issues when you receive an Excel not responding error, Excel hangs or freezes when you launch it, or open an Excel workbook.

Starting a Microsoft Office for Windows application in Office Safe Mode can allow you to safely use it when it has encountered certain problems.

Find out how to stop Windows Security from alerting you about or blocking a trusted file, file type, or process, by adding it to the exclusions list.

There are a number of possible explanations for why verification codes don't always arrive. Read through the list of the most common causes, and see if any of them apply to you, or use our troubleshooter to help guide you.

Get info on how to find your IP address in Windows. Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

Contact Microsoft Support. What's new. Surface Pro; Surface Laptop; Surface Laptop Studio 2

Learn how to remove passwords from your Microsoft account to increase security.

We've made it easier to keep Windows current with the latest features and improvements—and with fewer interruptions and restarts when you're using your PC the most.

Sync the files in your Microsoft 365 or Microsoft SharePoint site libraries so they’re always available on your computer, even when you’re offline.