Learn how to locate your 25-character product key or digital license for Windows 10 or Windows 11, depending on how you got your copy. See where to find your product key for Windows 7 or Windows 8.1, and how to tell if it's genuine.

Learn how to access your Outlook.com or Hotmail email account with your Microsoft Account username and password. Find solutions for common sign-in problems, such as unusual activity, account troubleshooter, and browser settings.

Learn how to use the System File Checker tool (SFC.exe) to scan and restore Windows system files that are not working or causing crashes. Follow the steps to run SFC.exe, view the scan results, and manually replace the corrupted files if needed.

Learn how to download and install Microsoft 365 or Office 2021 on a PC or Mac with a Microsoft account, work or school account. Find out how to activate, troubleshoot, and change versions of Microsoft 365 or Office.

Learn how to use Microsoft Defender to check your device for viruses or malware on Windows, Android, or Mac. Find out the signs of infection, the types of scans, and how to run Microsoft Defender Offline for a deeper scan.

Learn how to use a USB flash drive or DVD to install, reinstall, or perform a clean installation of Windows 10, 8.1, 7, or 11. Find the software download website, product key, and recovery options.

Learn how to access and manage a shared mailbox in Outlook for Microsoft 365, Outlook 2024, Outlook 2021, or Outlook on the web. A shared mailbox lets a group of users monitor and send email from a public alias, and also share a calendar and a contact list.

Learn how to use Windows File Recovery, a command line app from the Microsoft Store, to restore files that have been deleted from your local storage device. Find out the requirements, modes, syntax, and tips for this app.

Learn how to set your preferred web page as the default home page in different browsers, such as Microsoft Edge, Internet Explorer, Google Chrome, Firefox, and Safari. Follow the step-by-step instructions for each browser.

Learn how to optimize your Windows PC by updating, restarting, using ReadyBoost, adjusting settings, freeing up space, and more. Find out how to fix common issues that slow down your device and restore it from a system restore point.