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

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

某些Office 2019、Office 2016 和 Office 2013 产品都提供产品密钥。 如果你购买的产品附带产品密钥，请在首次安装 Microsoft 365 之前使用现有或新的 Microsoft ...

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

Hotmail is now Outlook.com. Learn how to sign in to access your Outlook.com, Hotmail, Live, or MSN email account.

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.

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

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.

Learn how to update drivers in Windows using Device Manager to update or reinstall a driver.

If you changed your hardware in order to upgrade to Windows 11 and the system is not recognizing the change in a timely manner, this article explains how to initiate the assessment manually.