Learn how to check for, download, and install KB 2919355, an update for Windows 8.1 and Windows RT 8.1.

Discover the latest updates for Windows 10, including improvements and fixes, known issues, and guidance on how to get the update.

获取有关 Windows 安全的帮助; 在 Microsoft Edge 中查看和删除浏览器历史记录; 删除和管理 Cookie; 重新安装 Windows 时安全移除有价值的内容

了解如何在 Excel 中使用函数 VLOOKUP 逐行查找表或区域中的数据。 我们的分步指南使 excel 中的 vlookup 变得简单高效。

Some extensions change browser settings like your default search engine, new tab page, and other types of site data. To prevent extensions from changing the preferences you set up when you installed Microsoft Edge , the browser automatically turns off extensions that might change your preferred settings.. You can change settings for your extensions at any time.

Find answers to common questions about genuine Windows software.

This content can help you with your work or school account, which is the account provided to you by your organization (for example, dritan@contoso.com).

Learn how to access and manage your Windows sign in options. Use a password, Windows Hello, or a security key to unlock your device.

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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。