Summary. The first hours of a newly installed Windows deployment can leave the system vulnerable because of a Microsoft Defender protection gap.

Devices running Windows 11 version 22H2 and older. If you're running Windows 11 version 22H2 and older, Windows 10, Windows 8.1, Windows 7 or any other earlier OS version, your device will not be affected by the MSDT Troubleshooter retirement.

Helping users safely navigate web, app, and game content is one of Microsoft’s top priorities. If you live in a region that requires permission to create an account and access Microsoft services, you may be prompted to request or give parental consent.

Announcing Access Dataverse Connector with Power Platform Unlock new capabilities organizations need and want like mobile solutions and Microsoft Teams integration.

Press and hold (or right-click) the MP4 file you want to play, select Open with, and then choose your preferred file player from the list of applications.

Review the warranty terms, check your warranty status, and learn about the protection plans for your Microsoft device or accessory.

如果你不希望第三方站点在你的电脑上存储 Cookie，则可以阻止 Cookie。 但是执行此操作可能会导致某些页面无法正确显示，或者可能会从站点收到一条消息，通知你需要允许 Cookie 才能查看该站点。

Find Microsoft Excel help and learning resources. Explore how-to articles, guides, training videos, and tips to efficiently use Excel.

准备好安装了吗？ 在开始之前，请确保电脑或 Mac 满足 系统要求。. 如果你已兑换产品密钥，只需重新安装应用，或者知道你已通过工作或学校分配了许可证，则可以跳到登录部分 ，下载并安装 Microsoft 365 或 Office。 但是，如果是 首次 安装 Microsoft 365 或 Office，可能需要先执行一些步骤。

Here are a few different ways to find help for Windows. Search for help - Enter a question or keywords in the search box on the taskbar to find apps, files, settings, and get help from the web.