注意: 此内容可帮助你使用工作或学校帐户。 如果在个人Microsoft帐户上遇到验证码问题，请参阅 验证码问题疑难解答。

Learn what to do if you see error 0x80072F8F when you try to connect to the Xbox network.

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 ...

联系 Microsoft 支持人员。查找常见问题的解决方案，或从支持专员那里获取帮助。

Learn how to fix a failed delivery message from the postmaster when using Outlook.

Signing your email messages with a digital ID helps to prove your identity and prevent message tampering.

Learn what you can do if you're not receiving account aign-in verification codes.

連絡 Microsoft 支援服務。尋找常見問題的解決方案，或向支援專員尋求協助。

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

Microsoft Support is here to help you with Microsoft products. Find how-to articles, videos, and training for Microsoft Copilot, Microsoft 365, Windows 11, Surface, and more.