激活 Windows - Microsoft 支持
了解如何使用产品密钥或数字许可证激活 Windows、检查激活状态，以及链接Microsoft 帐户。
Getting the most out of your PC backup - Microsoft Support
Learn why it's important to have a backup, and how Windows Backup can help you keep your files and settings safe.
Get help with Windows activation errors - Microsoft Support
Learn how to troubleshoot Windows activation errors. Browse common activation errors and learn what you can do to fix them.
Create and add an email signature in Outlook.com or Outlook on the web
Learn how to create and add a signature to email messages you send in Outlook.com.
Applies To:
Outlook on the web, Outlook.com, Outlook on the web for Exchange Server 2016, Outlook on the web for Exchange Server 2019
Fix problems with apps from Microsoft Store - Microsoft Support
Get troubleshooting tips to fix problems with apps from Microsoft Store.
Restart (reboot) your PC - Microsoft Support
Learn how to restart your PC on the Microsoft Support website.
Téléchargez et installez ou réinstallez Microsoft 365 ou Office 2021 ...
Découvrez comment installer, réinstaller ou activer Microsoft 365 ou Office 2019 sur un PC ou Mac.
Applies To:
Office 2021, Office 2021 for Mac, Office 2019, Office 2019 for Mac, Microsoft 365 for home, Office for business, Office 365 Small Business, Microsoft 365 admin, Office 365 operated by 21Vianet, Office 365 operated by 21Vianet - Admin, Microsoft 365 for Mac, Office 365 Germany - Enterprise, Office 365 Germany - Enterprise admin, Office.com
Windows Update トラブルシューティング ツール - Microsoft サポート
Windows Update トラブルシューティング ツールを実行して、Windows の更新プログラムのダウンロードとインストールでのエラーを解決します。
Sign-in options in Windows - Microsoft Support
Learn about the sign-in options in Windows settings.
Change screen brightness in Windows - Microsoft Support
Get steps for how to change screen brightness in Windows.