Learn how to troubleshoot Windows activation errors. Browse common activation errors and learn what you can do to fix them.

Windows Security is pre-installed on Windows 10 and ready for you to use at any time.

To play a recorded meeting in Microsoft Teams, go to the chat history of the meeting and click Play.

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。

Use Find my device to locate and lock your lost or stolen Windows devices.

Learn how to use antivirus protection in Windows Security to protect your Windows PC against malware, viruses, and other threats.

Get to know your way around Windows 11, from where to search to how to stay organized. Watch the video and read tips about new features.

About Windows 11 in S mode. Windows 11 in S mode is a version of Windows 11 that's streamlined for security and performance, while providing a familiar Windows experience.

We're committed to delivering continuous innovation by releasing new features and enhancements into Windows 11 more frequently. Windows devices get new functionality at different times as Microsoft delivers non-security updates, fixes, improvements, and enhancements via several servicing technologies—including controlled feature rollout (CFR). ...

We’re continually releasing updates to our application, based on customer feedback. Check out What's New in the latest updates for Skype on desktop and mobile.