Check the Xbox services, games, and apps for any service outages.

Want to add a padlock to your email messages? You can use encryption and digital signatures in new Outlook, classic Outlook, and Outlook on the web for work or school accounts to increase the security of messages. Encrypting an email message in Outlook means it's converted from readable plain text into scrambled cipher text. Only the recipient who has the private key that matches the public ...

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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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自 2025 年 3 月 19 起，不再支援適用於行動裝置的 Xbox Game Pass。 取得有關在其他裝置上進行雲端遊戲的詳細資訊。

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

Learn how to prevent unauthorised purchases on your Xbox by creating Microsoft accounts for every person who uses that console.

準備好安裝 Microsoft 365或 Office 2024了嗎？ 開始之前，請確保您的 PC 或 Mac 符合 系統需求。 如果您已兌換產品金鑰、重新安裝應用程式，或您已透過公司或學校指派授權，您可以略過並移至「登入」區段 ，以下載並安裝 Microsoft 365 或 Office。 不過，如果這是您 第一次 安裝 Microsoft 365或 Office，您可能 ...

Get info on how to sign up for, extend, or check the latest offers on subscriptions on your Xbox console.

Learn how to add all your different accounts to the Microsoft Authenticator app.