Learn how to install Windows 7 Service Pack 1 (SP1). Includes info about how to get the download, requirements, and more.

使用 vlookup、hlookup 和其他函数（如 index 和 match）根据您输入的值搜索和查找数据。 本文将让您快速回顾 vlookup，然后链接到更多内容。

Experience Microsoft Copilot on windows devices using the Copilot app! The Copilot app helps you get answers and inspiration from across the web, supports creativity and collaboration, and helps you focus on the task at hand.

Find out how to set up and manage your security info and verification codes for your Microsoft account, and troubleshoot common issues.

Obtenga información sobre cómo instalar, reinstalar o activar Microsoft 365 u Office 2019 en un equipo PC o Mac.

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

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。

There are some solutions you can try. First steps if your Surface Type Cover or Keyboard doesn't work. To try to resolve these issues, you can begin by following the steps below to get the latest updates, detach the Type cover or keyboard, force a restart, reattach the Type Cover or Keyboard, or confirm connectivity.. Get the latest updates

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

Learn how to reinstall Windows on your PC and how activation works after it's installed.