Change the email address or phone number for your Microsoft account
Learn how to change the email address or phone number that’s associated with your Microsoft account.
Contact - Microsoft Support
Contact Microsoft Support. What's new. Surface Pro; Surface Laptop; Surface Laptop Studio 2
啟用 Windows - Microsoft 支援服務
了解如何使用產品金鑰或數位授權啟用 Windows、檢查您的啟用狀態，以及連結您的 Microsoft 帳戶。
OneDrive release notes - Microsoft Support
Learn about the latest feature updates and bug fixes for the OneDrive sync app across all devices.
Applies To:
OneDrive for Business, SharePoint Server Subscription Edition, SharePoint Server 2019, SharePoint in Microsoft 365, Microsoft 365 admin, OneDrive (work or school), OneDrive (work or school) operated by 21Vianet, OneDrive for Mac, OneDrive for Windows, SharePoint admin center, SharePoint in Microsoft 365 Small Business, SharePoint operated by 21Vianet
Check your Microsoft warranty and create service orders
Registering your Microsoft device. Before you can check your warranty or get service, you may need register your Surface or Xbox to your account.
Word help & learning
Get answers to all of your Microsoft Word questions. Find Word help, how-to articles, training videos, tutorials, and more.
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
打开或关闭 Microsoft Defender 防火墙 - Microsoft 支持
即使已开启其他防火墙，开启 Microsoft Defender 防火墙也很重要。 它保护你免遭未经授权的访问。 若要打开或关闭 Microsoft Defender 防火墙，请执行以下操作：
How to add an email address or phone number to your Microsoft account
Add an email address or phone number to your Microsoft account and keep your current contacts, online storage, subscriptions, and account settings.
What's the difference between a paid Microsoft 365 subscription and the ...
Subscribed. A Subscribed badge means a Microsoft 365 subscription such as Microsoft 365 Family or Personal is already associated with your account and you can access many of your subscription benefits including installing the desktop apps.. Don't already have Microsoft 365, or you're looking for product details and prices? Buy or try Microsoft 365