Learn how to use the System File Checker tool (SFC.exe) to scan and restore Windows system files that are not working or causing crashes. Follow the steps to run SFC.exe, view the scan results, and manually replace the corrupted files if needed.

Find out how to download and install Office 2016 on your PC or Mac, or reinstall it if you already have a product key. Learn how to activate Office 2016 and troubleshoot common issues.

Learn how to use the PC Health Check app or manual steps to see if your device meets the system requirements for Windows 11 after changing your hardware. Find out how the upgrade offer is based on various factors and how to refresh the assessment.

Learn how to add, remove, connect, disconnect, and configure user accounts in Windows 10 and Windows 11. User accounts enable each person to have their own settings, documents, and applications on the same device.

Find solutions to common problems, or get help from a support agent for Microsoft 365, Office, Windows, Xbox, Surface and more. Sign in to get personalized help and access live chat, phone, or email options.

Learn how to remove a device from the Phone Link app on your PC and your Android or Surface Duo device. Follow the steps for both devices and sign out of your Microsoft account on the web.

Find out how to add your Outlook.com account to Outlook or another mail app using POP, IMAP, or SMTP settings. Learn how to enable POP or IMAP access, troubleshoot connection errors, and get help from Outlook.com Community.

如果这是你第一次安装 Microsoft 365，则可能需要先执行一些设置步骤。展开下面的 “了解详细信息”部分。 但是如果是重新安装 Microsoft 365，且已兑换了产品密钥并拥有与 Microsoft 365 相关联的帐户，请转到“登录并安装 Office”的部分。

Learn how to use the automated tool to uninstall Office from your computer. Follow the steps for different web browsers and select the version you want to remove.

Learn how to use a scanner and the Windows Scan app to save files to your PC as JPEG, bitmap, or PNG. Find out how to install and use a scanner in Windows 11 or Windows 10.