How to create or edit your Outlook signature for email messages. Include your signature, text, images, electronic business card, and logo.

Need help with an Xbox console, an Xbox game, or Xbox network? Find out how to get in touch with us.

Many apps allow you to authenticate by entering a code on another device such as a PC. If you want to sign in on a remote computer to install Authenticator, follow these steps.

Learn all about games and apps for Xbox and get help with any problems you're having.

We're still the best way to write quick notes on your Windows desktop, but now you can also take your sticky notes with you, allowing you to capture, find, and use your notes across apps and your favorite devices.

Get an error message or error code when making a purchase on Xbox? Find out what they mean.

Certificate authority (CA) A certificate authority is an entity similar to a notary public. It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired. Top of Page Digital signature assurances The following terms and definitions show what assurances are provided by digital signatures. Authenticity The signer is ...

取得有關 Xbox Game Pass 的常見問題解答，包括方案差異、如何管理訂閱、遊戲可用性、家庭共享、多人遊戲存取及疑難排解提示。

Learn how to locate and manage your app permissions on Windows devices. Some apps or games need specific permissions to work properly.

Learn how you can use the free Microsoft Authenticator app to sign in to all your accounts without using a password.