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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

Xbox Support 提供有关 Xbox、Game Pass 和账单问题的帮助，并通过社区提供建议和客户服务。

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

Contact Microsoft Support. Find solutions to common problems, or get help from a support agent.

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。

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。

Before you can use Authenticator as a way to sign in, you need to download the app and have already added Authenticator to your accounts. Starting July 2025, the autofill feature in Authenticator will stop working, and from August 2025, passwords will no longer be accessible in Authenticator.

Learn how to sign in and create app passwords for Microsoft apps and devices that don't support two-step verification.

With two-step verification, you'll get a security code to your email, phone, or authenticator app every time you sign in on a device that isn't trusted. Need more help?

注意: Microsoft Authenticator 不适用于电脑或 Mac，因为出于安全原因，验证器应用通常用于智能手机。 了解详细信息。 Microsoft不再支持超过一年的 Authenticator 版本。 始终使设备保持最新状态。 从 2025 年 7 月开始，Authenticator 中的自动填充功能将停止工作，并且从 2025 年 8 月起，密码将不再可在 ...