Learn different ways to remove apps and programs from your Windows 10 or 11 device. Find tips for troubleshooting, repairing, and protecting your system from malware.

Learn how to download and install Microsoft 365 or Office 2019, 2016, or 2013 on your PC or Mac. Find out how to activate Office, troubleshoot issues, and switch languages or bit versions.

Learn how to use the PC Health Check app to see if your device meets the system requirements for Windows 11 after changing hardware. Find out how to manually refresh the eligibility assessment and troubleshoot issues with the app.

Learn how to download and install Microsoft 365 apps like Word, Excel, Teams, and PowerPoint on your PC or Mac. Follow the instructions in the browser and sign in with your Microsoft 365 account to activate the apps.

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 download and install Microsoft 365 or Office 2021 on a PC or Mac with a Microsoft account, work or school account, or product key. Find out how to activate, change versions, and troubleshoot common issues.

Learn how to view and delete your Microsoft Edge browsing history stored on your device, across synced devices, and in the cloud. You can also clear Internet Explorer browsing data using Microsoft Edge if your organization has turned on Internet Explorer mode.

Learn how to prepare your device, transfer your files, and install Windows 11. Find out the system requirements, features, and productivity tools of the new Windows experience.

Learn how to view, install, and change settings for add-ins that enhance Microsoft 365 programs. Find out how to deal with add-in crashes, device permissions, and subscription cancellations.

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。