Learn how to create a USB flash drive or DVD to install or reinstall Windows 11, 10, 8.1, or 7. You'll need a reliable internet connection, a blank storage device, and a product key (if applicable).

Learn how to download and install Microsoft 365 or Office 2021 on a PC or Mac with a Microsoft account, work or school account. Find out how to activate, troubleshoot, and change versions of the apps.

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 find your BitLocker recovery key, a 48-digit number needed to unlock an encrypted drive in Windows. The recovery key can be attached to your Microsoft account, work or school account, printout, or USB flash drive.

Learn where to enter your product key for different versions of Office or Microsoft 365, and how to install or reinstall Office after redemption. Find tips for troubleshooting product key issues and contacting support.

Learn how to update your Surface drivers and firmware for Windows 10 or Windows 11. Find links to download packages, check for updates, and troubleshoot issues.

Learn about the new features and updates in Office 2024 and Office LTSC 2024, including a new default theme, improved accessibility, dynamic charts, cameo, video recording, and more. Compare the differences between Office 2024 for consumers and Office LTSC 2024 for commercial customers.

Learn how to check the recent sign-in activity for your Microsoft account and what to do if you see unusual or suspicious activity. Find out how to change your password, update security settings and contact support.

将必应作为默认搜索引擎，将增强在 新版 Microsoft Edge 中的搜索体验，包括直接指向 Windows 应用的链接、来自组织的相关建议（如果使用工作或学校帐户登录），和有关 Windows 的问题的即时解答。 但是，你可以将默认搜索引擎更改为使用 OpenSearch 技术的任何站点。

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。