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 manage your Microsoft subscription, including billing, renewal, and cancellation options.

Find help and training for Microsoft 365 products and apps, including Outlook, OneDrive, Word, Excel, PowerPoint, and more. Learn about Microsoft 365 Copilot, the AI companion in your Microsoft 365 apps, and explore other topics and resources.

Learn how to mirror or project another device's screen to your Windows PC using Miracast. Follow the steps for Windows 11 or Windows 10 to install and use the Wireless Display app or the Connect app.

Learn how to access your Hotmail or Outlook.com email account with your Microsoft Account password. Find troubleshooting tips, service status, and help options if you have problems signing in.

Learn how to cancel an Xbox subscription and check for refund eligibility in different countries and markets. Find out the terms and conditions, troubleshooting tips, and contact information for Xbox subscription issues.

Learn how to insert, remove, and toggle checkboxes in Excel for interactive lists and forms. Checkboxes have the value TRUE or FALSE and can be referenced with formulas.

Copilot is a feature that requires a subscription and a compatible account. Learn how to check your license, update your channel, and adjust your privacy settings to find Copilot in Word, Excel, PowerPoint, and Outlook.

Find the phone number for your region and account type to get help from Microsoft. You can also use the Get help link to describe your problem and get self-help or chat support.

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。