PC 正常性チェック アプリは、お使いの Windows デバイスの正常性に関する最新の情報を提供して、デバイスのパフォーマンス向上のための対処や、パフォーマンス問題のトラブルシューティングに役立ちます。

Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

Erfahren Sie, wie Sie Microsoft 365 oder Office 2019 auf einem PC oder Mac installieren, erneut installieren, oder aktivieren.

Learn how to use the taskbar features in Windows. Hide the taskbar, pin an app, change the location, and more with taskbar settings.

Learn more about how to fix problems with the Windows Start menu, and what to do if the Start menu won't open.

This topic offers troubleshooting tips if you don't have the Teams Meeting add-in in Outlook for Windows. The add-in helps you set up a Teams meeting from your Outlook email.

Follow these steps to temporarily turn off Defender antivirus protection in Windows Security. Keep in mind that if you do, your device may be vulnerable to threats.

The Planner app in Microsoft Teams brings together all your tasks and plans across the Microsoft 365 ecosystem in a single convenient location. It helps you manage tasks more efficiently for individual plans and team initiatives, as well as larger scale projects that are aligned to goals and key strategic objectives.

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

Microsoft removed the ability to connect new third-party accounts such as a Gmail account and sync existing connected accounts from within Outlook.com.