Learn how to use the PC Health Check app to help you improve your device performance.

If your phone number or email changes, it's important to promptly update the security contact info on the Security basics page so we can work with you to keep your account secure and active. If you sign in to your account while traveling or if you install a new app that signs in with your account, you may get an alert. We just need you to ...

If you’re having sound or audio problems, the following suggestions might help. The tips are listed in order, so start with the first one, see if that helps, and then continue to the next one if it doesn’t.

Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

Learn how to create installation media for installing or reinstalling Windows 7, Windows 8.1, or Windows 10.

Learn how to install Office 2013 on your PC or Office for Mac 2011.

If you’re working on a Windows PC and want the apps and content from another device to show on your PC screen, you’ll want to consider mirroring that device‘s screen or projecting it to your PC.

Outlook.com、Hotmail、Live、または MSN のメール アカウントにサインインできない場合、サインインまたはサインアウトする方法がわからない場合は、次の解決方法を試してみてください。

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Learn how to redeem a gift card, code, or Office product key and spend your balance at Microsoft Store online, on Windows, or Xbox.