If your purchase of Office or Microsoft 365 came with a product key, you enter your product key on one of the websites listed below for your product.

How to use the IF function in Excel to make logical comparisons between data values.

Admins set default meeting settings. They try to optimize for most use cases, but if you want to adjust your options for a specific Teams meeting, go to Meeting options.

Fresh Start in Windows 10 lets you perform a clean reinstallation and update of Windows while keeping your personal data and most Windows settings intact.

Discover how to earn Microsoft Rewards points through various activities and redeem them for exciting rewards.

Use your Microsoft account to sign in to Microsoft services like Windows, Microsoft 365, OneDrive, Skype, Outlook, and Xbox Live.

How to use the COUNT function in Excel to count the number of cells that contain numbers, and to count numbers within a list of arguments.

On the Change your password page, enter your current password and then enter your new password. For additional security, select the optional checkbox which prompts you to update your password every 72 days.

Microsoft アカウントのセキュリティ情報を管理し、確認コードの問題をトラブルシューティングする方法について説明します。

Learn how to remove malware from your PC. Use Microsoft Defender Antivirus in Windows 10 or Windows 11 to scan your PC for malware, viruses, or other threats.