Get the latest update for Windows 10. Windows 10 automatically downloads and installs updates to make sure your device is secure and up to date.

Xbox Support offers help for Xbox, Game Pass, and billing questions. Get advice and customer service in the Xbox Support community.

As you browse the web, you'll see an icon in the address bar that indicates the security of the connection to the site you're visiting. This icon helps you determine if you can safely send and receive information from the site.

Learn how to change or reset your Windows password if you've forgotten or lost it.

Learn how to change the power mode on your Windows PC to preserve your battery, limit notifications, and background activity.

Windows 10 lets you quickly check your network connection status. And if you're having trouble with your connection, you can run the Network troubleshooter to try and fix it.

Office または Microsoft 365 を購入したときにプロダクト キーが付属していた場合は、使用している製品に対応する以下の Web サイトのいずれかにプロダクト キーを入力します。

Lists all Excel functions by their category, such as Logical functions or Text functions.

Explore your options and settings when you install add-ins.

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.