Play MP4 files in Windows by right-clicking the file and choosing what application to open it with.

Learn how to install Windows Pro or Windows Pro for Workstations using a product key.

Learn what to do if Surface won’t turn on, turns on then off, or starts and gets stuck on a screen—a black screen, a screen with a logo, or another screen

Keyboard shortcuts for Microsoft Loop Keyboard shortcuts are keys or combinations of keys that provide an alternative way to do something that you'd typically do with a mouse. Here are some common keyboard shortcuts for navigating Microsoft Loop. Additionally, Microsoft Loop supports Markdown syntax.

Learn how to run Windows Update Troubleshooter to resolve errors downloading or installing Windows updates.

Learn how to run Windows Update Troubleshooter to resolve errors downloading or installing Windows updates.

Preview your document Select File > Print. To preview each page, select the forward and backward arrows at the bottom of the page. If the text is too small to read, use the zoom slider at the bottom of the page to enlarge it. Choose the number of copies, and any other options you want, and select the Print button. Print specific pages Select File > Print. To print only certain pages, print ...

Learn how to access Windows device security settings in Windows Security to help protect your device from malicious software.

Přečtěte si, jak zálohovat a obnovovat aplikace, nastavení, soubory, fotky a oblíbené položky a předvolby Microsoft Edge na počítači s Windows pomocí programu Windows Zálohování.

您的 Microsoft 帳戶會在許多工作上取代產品金鑰的作用，例如啟用 Microsoft 365 和重新安裝 Microsoft 365。 有關 Microsoft 365 產品金鑰的常見問題 查看以下各節，以了解您是否需要 Microsoft 365 產品金鑰，以及如果您有產品金鑰的話該如何處理它。