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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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 ...

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Xbox Support ... Xbox Support

了解如何在智慧型電視、Amazon Fire TV 或 VR 頭戴式裝置上設定 Xbox Cloud Gaming。 包括安裝 Xbox 應用程式、連線控制器以及使用 Game Pass 串流遊戲的步驟。

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

Game Bar 可協助您在 Windows 10/11 上與朋友玩遊戲和聊天時, 與 Xbox 社群保持聯繫。

Learn how to add new Xbox friends so you can quickly find them online and get set for your next gaming adventure.

Learn how to install Windows 11, including the recommended option of using the Windows Update page in Settings.

Hotmail is now Outlook.com To sign in to Hotmail, you'll need your Microsoft account username and password. Sign in at outlook.live.com

Whenever your access is challenged, Teams will show you a sign-in banner and request that you Sign in to re-authenticate and regain access.