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重要: Microsoft帐户、Windows 操作系统和其他Microsoft产品包括密码，以帮助保护你的信息。本文提供了一些选项，可用于在忘记密码时重置或恢复密码。请注意，如果这些选项不起作用， Microsoft支持无法帮助你检索或绕过丢失或忘记的密码。

了解如何在電腦或 Mac 上安裝、重新安裝或啟用 Microsoft 365 或 Office 2019。

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

Find out how to fix sound or audio problems in Windows.

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

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 install, reinstall, or activate Microsoft 365 or Office 2019 on a PC or 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

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.

Hotmail está ahora Outlook.com. Aprenda a iniciar sesión para acceder a su cuenta de correo electrónico de Outlook.com, Hotmail, Live o MSN.

Applies To: Outlook.com

Learn how to activate Windows using a product key or digital license, check your activation status, and link your Microsoft account.