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Learn how to install Skype for Business on your Windows computer, mobile device, or Macintosh.

了解如何管理 Microsoft 帐户安全信息和排查验证码问题。

Learn about the message "Wi-Fi isn't secure" that appears in Windows when you're connected to a Wi-Fi network that's not secure.

Learn how to activate Windows using a product key or digital license, check your activation status, and link your Microsoft account.

Get support for all Office.com apps, including Excel, Word, and PowerPoint, with step-by-step guidance and troubleshooting.

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Active content is additional functionality in a file or program, such as macros, add-ins, or data connections. This article lists types of active content that can be blocked by settings in Trust Center and which, when present in a document, cause display of the Message Bar when you open your file.

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Learn how to troubleshoot and fix problems with nearby sharing in Windows.