了解如何使用产品密钥或数字许可证激活 Windows、检查激活状态，以及链接Microsoft 帐户。

Create an alias to give you an additional email address which uses the same inbox, contact list, and account settings as your primary email address in Outlook.com.

Learn the difference between IMAP and POP, and when to use each one.

How to access your Microsoft account? If you have confirmed that your email is a Microsoft account, you can access it by following these steps:

Learn how to sign into your PC with Windows Hello using a PIN, facial recognition, or fingerprint.

Learn how to stop, cancel or pause uploads and downloads in OneDrive.

Learn how to access Windows device security settings in Windows Security to help protect your device from malicious software.

If you know your username and password but they have stopped working, read My username and password have stopped working.. If you forgot your Microsoft account username or email address, and you have previously set up other security information on your Microsoft account, follow the steps below.

Hotmail 現在為 Outlook.com。 瞭解如何登入以存取您的 Outlook.com、Hotmail、Live 或 MSN 電子郵件帳戶。

How to use the SUMIF function in Excel to add the values in a range that meet criteria that you specify.