Select Review activity to check for any unusual sign-in attempts on the Recent activity page.If you see account activity that you're sure wasn't yours, let us know and we can help secure your account—if it's in the Unusual activity section, you can expand the activity and select This wasn't me.If it's in the Recent activity section, you can expand the activity and select Secure your account.

注意: 如果连接到电脑的设备（例如显示器、打印机或扫描仪）在从睡眠状态或休眠状态唤醒后不能正确工作，你可能需要先断开设备连接并重新连接或重新启动电脑。还应确保你具有适用于所有设备的最新驱动程序。

Important: If your device is out of support, it is no longer receiving security updates from Microsoft and may become more vulnerable to security risks and viruses.Therefore, we strongly recommend that you update to the latest version of Windows. Each version of Windows is supported for 18 months.

If you know your username and password but they have stopped working, read My username and password have stopped working.. If you forgot your Microsoft account username or email address, and you have previously set up other security information on your Microsoft account, follow the steps below.

Focus is a new feature in Windows 11 that helps you minimize distractions. To help you stay on track, it integrates with the Clock app with features like a focus timer and music integration.

在 Microsoft，我们遵循我们的 AI 原则、负责任的 AI 标准，以及数十年来在 AI、基础和隐私保护机器学习方面的研究。 数据隐私和安全是负责任的 AI 的关键原则。 我们的目标是帮助客户负责任地使用 AI 产品，共享学习内容，并建立基于信任的合作关系。

Windows 8.1 Update and Windows RT 8.1 Update (also known as KB 2919355) include improvements that make your favorite apps and settings easier to find and use, provide more familiar mouse and keyboard options, and update security and performance.Here’s what you need to know about installing this important update. Check to see if it’s already installed

查找有关 Windows 操作系统的帮助和操作方法文章。 获取对 Windows 的支持，并了解安装、更新、隐私、安全等方面的信息。

With Word for the web, you use your web browser to create, view, and edit the personal documents that you store on OneDrive.If your organization or college has a Microsoft 365 plan or SharePoint site, start using Word for the web by creating or storing documents in libraries on your site.Save changes. Word saves your changes automatically.

Training: As you work in Microsoft 365, it's simple to share your files and collaborate with others in real time - on documents, worksheets, presentations, and more. Watch this video to learn how.