Learn how to find the serial number on your Surface so you can register your product or request service.

If your Outlook.com account has been blocked, follow the instructions in this article to unblock it.

Create a system restore point. Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

You can resolve problems with Microsoft Authenticator by checking the tips in this article and reviewing some of the known errors.

If you don’t like the default date format, you can pick a different one in Excel, like February 2, 2012 or 2/2/12. You can also create your own custom format in Excel.

It's easy to attach pictures, files, and other items to your Outlook messages. Outlook keeps track of the documents you’ve recently worked on, whether they're stored on your computer or saved in OneDrive (cloud only).

Use the new Outlook for Windows for coordinated Mail, Calendar and People apps on Windows 11.

Set the default font. When you set a default font, every new message you create uses that font setting by default.

[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。

Learn how to download, install, and configure additional language packs for your version of Windows.