获取 Windows 升级和安装错误的帮助 - Microsoft 支持
请参阅一些最常见的升级和安装错误，了解Windows 10和Windows 11，以及可尝试修复的错误。
Using product keys with Office - Microsoft Support
Answers to questions on finding, getting, and applying product keys.
Applies To:
Excel for Microsoft 365, Word for Microsoft 365, Outlook for Microsoft 365, PowerPoint for Microsoft 365, Access for Microsoft 365, OneNote for Microsoft 365, Publisher for Microsoft 365, Visio Plan 2, Excel 2021, Word 2021, Outlook 2021, PowerPoint 2021, Access 2021, Project Standard 2021, Publisher 2021, Visio Professional 2021, Visio Standard 2021, Office 2021, OneNote 2021, Excel 2019, Word 2019, Outlook 2019, PowerPoint 2019, Access 2019, Project Standard 2019, Publisher 2019, Visio Professional 2019, Visio Standard 2019, Office 2019, Excel 2016, Word 2016, Outlook 2016, PowerPoint 2016, OneNote 2016, Project Professional 2016, Project Standard 2016, Publisher 2016, Visio Professional 2016, Microsoft 365 for home, InfoPath 2013
Join a Teams meeting - Microsoft Support
Join Teams meeting with ease using our step-by-step guide. Learn how to join a Teams meeting via your calendar, a dial-in number, or on the web.
Applies To:
Microsoft Teams
Device encryption in Windows - Microsoft Support
Device encryption helps protect your data and it's available on a wide range of Windows devices.
Contact - Microsoft Support
Contact Microsoft Support. What's new. Surface Pro; Surface Laptop; Surface Laptop Studio 2
Register your personal device on your work or school network
Next steps. After you register your personal device to your organization's network, you should be able to access most of your resources. If your organization wants you to join your work device, see Join your work device to your organization's network.
Register the password reset verification method for a work or school ...
If you forgot your work or school password, never got a password from your organization, or have been locked out of your account, you can use your security info and your mobile device to reset your work or school password.
About Microsoft Authenticator - Microsoft Support
Learn how you can use the free Microsoft Authenticator app to sign in to all your accounts without using a password.
Applies To:
Microsoft account dashboard
Get help with a digital code or gift card | Xbox Support
Find out more about Xbox digital codes and gift cards, and how to troubleshoot issues redeeming content.
Add a custom domain name - Microsoft Support
Learn how to add a custom domain name to your Microsoft 365 subscription with this support guide from Microsoft.