My product key isn't working. If your Office product key doesn’t work, or has stopped working, you should contact the seller and request a refund. If you bought a product key separate from the software, it’s very possible the product key was stolen or otherwise fraudulently obtained, and subsequently blocked for use.

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。

Learn how to view, manage, and delete cookies in Microsoft Edge.

Learn how to troubleshoot USB-C problems in Windows and fix USB devices, ports, and adapters not working properly.

To download the offline installer for Internet Explorer 11, choose your language and system below.

Learn how to reset your PIN if you aren't signed in to Windows and having trouble using your PIN.

Hotmail is now Outlook.com. Learn how to sign in to access your Outlook.com, Hotmail, Live, or MSN email account.

Share your calendar in an email. If you don't want to give someone permissions to share your calendar and see updates, you can email a static copy of your calendar for a specific date range.

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

Aprende a conectar un dispositivo Bluetooth en Windows y ajustar la configuración de emparejamiento de Bluetooth.