Learn about different things you can try to fix network connection problems in Windows.

Learn how to use antivirus protection in Windows Security to protect your Windows PC against malware, viruses, and other threats.

Learn how you can use the free Microsoft Authenticator app to sign in to all your accounts without using a password.

How to use the FILTER function in Excel to filter a range of data based on criteria you define.

Windows Update can help fix problems with your PC. Fix problems using Windows Update is a recovery tool that can help resolve issues related to updates. Using this tool will reinstall the current version of Windows on your device.

If you get an email about unusual activity on your Microsoft account, or if you’re worried that someone else might have used your account, go to the Recent activity page.You’ll see when your Microsoft account was signed in during the last 30 days, along with any device or app-specific info.

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

Discover the latest features in Office 2021, including new ways to create content, manage data, and communicate effectively.

The TEXT function lets you change the way a number appears by applying formatting to it with format codes.It's useful in situations where you want to display numbers in a more readable format, or you want to combine numbers with text or symbols.

Get troubleshooting tips to fix problems with apps from Microsoft Store.