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。

Master the art of Excel formulas with our comprehensive guide. Learn how to perform calculations, manipulate cell contents, and test conditions with ease.

On the Change your password page, enter your current password and then enter your new password. For additional security, select the optional checkbox which prompts you to update your password every 72 days.

此疑难解答将为计算机尚未更新至最新版本 Windows 10 版本 1607 的客户提供协助。 此更新最初只会发布给一小组有针对性的客户。 这些客户会随着时间的推移而扩展。 Windows 用户可以从本文启动助手。

Learn more about how to find all your apps and programs in the all new Windows Start menu.

Find your Wi-Fi network password in Windows, so you can connect to your Wi-Fi network on other devices.

Set up the Microsoft Authenticator app from the Security info page. Depending on your organization’s settings, you might be able to use an authentication app as one of your security info methods.

Create a template for email messages that you frequently send with similar contents.

If the Excel data you want to filter requires complex criteria you can filter by using advaned criteria.

Learn how to find the serial number on your Surface so you can register your product or request service.