Learn about Windows service packs and download the latest updates for Windows 10 and Windows 8.1

Get help with using mail, calendar, and contacts on Outlook.com.

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Learn how to activate Windows using a product key or digital license, check your activation status, and link your Microsoft account.

Learn how to add a printer or scanner in Windows. If your printer connects by a wire, plug it into your device. It'll connect automatically, your PC will download the right drivers, and you can use it right away.

The steps below will help you add a Gmail account to new Outlook, or manage an existing account by deleting it or making it your primary account. Add a new Gmail account. On the View tab, select View settings.

Learn how to connect to a Wi-fi network in Windows and manage your current network connections.

Learn why it's important to have a backup, and how Windows Backup can help you keep your files and settings safe.

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

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。