Microsoft Authenticator is a free app that helps you sign in to all your accounts without using a password - just use a fingerprint, face recognition, or a PIN.

連絡 Microsoft 支援服務。尋找常見問題的解決方案，或向支援專員尋求協助。

Important: The calculated results of formulas and some Excel worksheet functions may differ slightly between a Windows PC using x86 or x86-64 architecture and a Windows RT PC using ARM architecture.Learn more about the differences.

Invisible digital signatures in Word, Excel, or PowerPoint. An invisible digital signature, like a visible digital signature line, assures the authenticity, integrity, and origin of a document.

Why some files won't open in Internet Explorer. Internet Explorer uses add-ons such as Adobe Reader to view some files in the browser. If a file that needs an add-on won't open, you might have an older version of the add-on, which needs to be updated.

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。

In addition to the File menu, you can turn this feature on or off right from the context menu of a One Drive or SharePoint-hosted Word, Excel, or PowerPoint document URL appearing in a Word, Excel, PowerPoint, or Outlook Windows application. The context menu also allows you to choose a one-time file open behavior for a specific link by using the Open With menu option.

To add a personal or work/school account to OneDrive on your pc. Open OneDrive settings (select the OneDrive cloud icon in your notification area, and then select the OneDrive Help and Settings icon then Settings.)

Use the Quick Assist app to get help with a computer problem from family or friends or help them out. Quick Assist uses a remote connection, so remember to only use it with people you trust, since they can see your computer screen or control your PC (if you allow it).

Microsoft Reflect helps you create impactful check-ins to gain insights into your learners' well-being and build a happier and healthier learning community, all through one easy-to-use app. By identifying your students' emotions, you can express fill their needs. Use emojis and pictures of emotion words to gauge how students feel.