使用第 Outlook.com 电子邮件地址创建帐户时，电子邮件地址必须是你有权访问的有效地址。 您可以使用第三方电子邮件地址登录到Outlook.com 邮件和日历，但若要从第三方帐户访问电子邮件，必须设置为已连接帐户。

Learn how to redeem a gift card, code, or Office product key and spend your balance at Microsoft Store online, on Windows, or Xbox.

Find out how to back up your apps, files, photos, and preferences on your Windows PC with File History and other tools.

Learn how to sign in to your Hotmail account, now known as Outlook.com, and access your emails.

Learn how to access and manage your Windows sign in options. Use a password, Windows Hello, or a security key to unlock your device.

Learn how to create installation media for installing or reinstalling Windows 7, Windows 8.1, or Windows 10.

Select Start > All apps and search for the app in the list shown. Press and hold (or right-click) on the app, then select Uninstall. Uninstall in Settings. Select Start > Settings > Apps > Apps & features . Find the app you want to remove, select More > Uninstall. Note: Some apps can't be uninstalled from the Settings app right now.

如何将 IF 函数 (与 Excel 中) AND、OR 和 NOT 函数结合使用，以在给定值之间进行逻辑比较。 示例 下面是 Excel 中一些常见的嵌套 IF (AND ) 、IF (OR ) 和 IF (NOT ) 语句的示例。

Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

Set up the Authenticator app. After you install the Authenticator app, follow the steps below to add your account: Open the Authenticator app. Select (+) in the upper right corner. Point your camera at the QR code or follow the instructions provided in your account settings. After your account appears in your Authenticator app, you can use the ...