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.

Master the art of Excel formulas with our comprehensive guide. Learn how to perform calculations, manipulate cell contents, and test conditions with ease.

Outlook.com、Hotmail、Live、または MSN のメール アカウントにサインインできない場合、サインインまたはサインアウトする方法がわからない場合は、次の解決方法を試してみてください。

Improve your writing skills with Word's tools for spelling, grammar, and clarity. Find out how to check and correct errors in your documents.

Troubleshoot problems you might be having with your mouse or keyboard, or other wireless device in Windows.

If you need help with Outlook.com, you can read our self-help content, or get support via email.

Découvrez comment installer, réinstaller ou activer Microsoft 365 ou Office 2019 sur un PC ou Mac.

Add additional privacy protection to email messages with encryption.

Use the XLOOKUP function when you need to find things in a table or a range by row. For example, look up the price of an automotive part by the part number, or find an employee name based on their employee ID. With XLOOKUP, you can look in one column for a search term, and return a result from the same row in another column, regardless of which side the return column is on.

Learn how to turn on device encryption, or standard BitLocker encryption in Windows.