Protect your Android, iPhone, Mac, and Windows devices from threats by installing Microsoft Defender. Download Microsoft Defender on your devices either by:

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

Training: Get started with SharePoint in Microsoft 365. At office.com, sign in to SharePoint, then select the SharePoint tile.

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。

Copilot in Word ushers in a new era of writing, leveraging the power of AI. Check out this article to learn more.

Learn how to locate and manage your app permissions on Windows devices. Some apps or games need specific permissions to work properly.

Update Surface devices and Windows. Download the latest drivers and firmware updates to keep your Surface devices performing their best.

Download the latest Windows update from the Windows Update page in Settings for your device when it becomes available.

Learn how to enable virtualization through the UEFI (or BIOS) of your PC to run the Windows Subsystem for Android or Windows Subsystem for Linux.

When you enable an add-in, it adds custom commands and new features to Microsoft 365 programs that help increase your productivity. Because add-ins can be used by attackers to do harm to your computer, you can use add-in security settings to help protect yourself.