Learn why you received a notification about unusual activity in your account and what to do next.

Discusses how to troubleshoot problems that occur when you try to access or work with files and folders in Windows.

Learn how to activate Windows using an internet connection, automated system, or live support advocate.

This article answers common questions about Microsoft Authenticator. Select the headings below to see more information.

Internet Explorer 11 support ended on June 15, 2022. We recommend you use Microsoft Edge for a faster, more secure and more modern web browsing experience.

Learn how to install a scanner and use it to scan pictures and documents in Windows 10.

Learn how to manage extensions in Microsoft Edge, including adding, disabling, or removing them as needed.

Erfahren Sie, wie Sie Ihr Windows-Kennwort ändern oder zurücksetzen, wenn Sie es vergessen oder verloren haben.

Get to know your way around Windows 11, from where to search to how to stay organized. Watch the video and read tips about new features.

Microsoft アカウントで通常とは異なるアクティビティに関するメールを受け取った場合、または他のユーザーがアカウントを使用している可能性が心配な場合は、[最近のアクティビティ] ページに移動します。過去 30 日間に Microsoft アカウントにサインインしたすべての日時と共に、デバイス ...