If you cannot open your Outlook data file or suspect that the file is damaged, use the Inbox Repair tool (scanpst.exe) to repair errors in the file.

When the latest Windows update is ready for your device, it will be available to download from the Windows Update page in Settings.

Find answers to frequently asked questions about Office 2021 and Office LTSC for Windows and Mac on the official support page.

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.

Learn how to manage your Microsoft devices. Add, remove, register, or rename a device on your Microsoft account.

Learn about Windows service packs and download the latest updates for Windows 10 and Windows 8.1

You can insert a drop-down list of valid entries (also called a drop-down menu or drop-down box) in Excel to make data entry easier, or to limit entries to certain items that you define.

The new Microsoft Edge is based on Chromium and was released on January 15, 2020. It is compatible with all supported versions of Windows, and macOS. With speed, performance, best in class compatibility for websites and extensions, and built-in privacy and security features, it's the only browser you'll ever need.

How to freeze panes in Excel to keep rows or columns in your worksheet visible while you scroll, or lock them in place to create multiple worksheet areas.

Microsoft Edge で、閲覧履歴やその他の履歴を表示したり削除したりする方法について説明します。