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

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 remove apps and programs from your Windows 10 or 11 device using different methods. Find tips and troubleshooters for common issues and errors.

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.

准备好安装了吗？ 在开始之前，请确保电脑或 Mac 满足 系统要求。. 如果已兑换产品密钥，只需重新安装应用，或者知道你已通过工作或学校分配了许可证，则可以跳到 “登录”部分，下载并安装 Microsoft 365 或 Office。 但是，如果是 首次 安装 Microsoft 365 或 Office，可能需要先执行一些步骤。

Learn how to use Microsoft and Xbox gift cards, download codes and tokens to your Microsoft account. Find out how to redeem Office product keys and Windows activation codes, and get help with common problems.

Learn how to switch to the new Outlook for Windows, a preview app with the latest features and design. Find out how to import settings, customize the experience, and get feedback or support.

Learn how to access SharePoint through your web browser and your work or school account. Find out how to troubleshoot if you can't see or find the SharePoint app on office.com.

Learn how to scan and repair missing or corrupted system files in Windows using the System File Checker tool (sfc/scannow). Follow the steps to run the tool, view the scan results, and manually replace the corrupted files if needed.

Learn how to use Copilot in Word, a new AI feature that can help you write, rewrite, and transform text in your documents. Copilot can generate content based on your prompts, questions, and existing text, and provide references and citations.