Learn how to troubleshoot and fix problems setting up your email in Outlook.

Typically, the disc will start playing automatically. If it doesn't play, or if you want to play a disc that is already inserted, open Windows Media Player, and then, in the Player Library, select the disc name in the navigation pane.

An upgrade differs from an update in that it moves your PC from a previous version of Windows—such as Windows 10—to Windows 11. This FAQ is intended to answer questions about upgrading to Windows 11.

If your purchase of Office or Microsoft 365 came with a product key, you enter your product key on one of the websites listed below for your product.

How to calculate the number of days, months, or years between two dates using the DATEIF function in Excel.

Create a recovery drive so you can reinstall Windows 10 or Windows 11 in case you experience a major issue such as hardware failure.

Safe mode starts Windows in a basic state, using a limited set of files and drivers. If a problem doesn't happen in safe mode, this means that default settings and basic device drivers aren't causing the issue. Observing Windows in safe mode enables you to narrow down the source of a problem, and can help you troubleshoot problems on your PC.

Share your calendar in an email. If you don't want to give someone permissions to share your calendar and see updates, you can email a static copy of your calendar for a specific date range.

Learn how to use and install mobile apps on your Windows 11 PC with the Windows Subsystem for Android™.

[設定] の [Windows Update] ページにアクセスするための推奨オプションなど、Windows 11 をインストールする方法をご覧ください。