Learn about getting started with the new Microsoft Defender on your personal devices including Windows, Mac, Android, and iOS.

Learn how to install, reinstall, or activate Microsoft 365 or Office 2019 on a PC or Mac.

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Enter your current password, enter your new password, and then select Save.

If you’ve forgotten your Microsoft account password, learn how to do a password reset online or by using your Xbox console.

Microsoft アカウントにサインインするためのエイリアスを使用した Microsoft アカウントのメール アドレスまたは電話番号を変更する方法について説明します。

How to use the COUNTIF function in Excel to count the number of cells that meet values you set.

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

This article is for Outlook.com. If you're using Outlook for Windows, see Fixes or workarounds for recent issues in Outlook for Windows.. If you're having problems accessing Outlook.com, you can see the status of Microsoft Office Online Services at the Service Health portal.. If you're having problems sending or receiving email, read how to Fix Outlook.com email sync issues.

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