See how to view the details for signatures and certificates.

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 It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired.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

If you want to manage access to both email and documents, you can choose between using built-in Mobile Device Management for Office 365 or Microsoft Intune. Compare the features offered by each service so you can choose which one is best for your needs.

We have a range of support options to meet your business needs.

Optionally, based on your organization's choices, you might be automatically enrolled in mobile device management, such as Microsoft Intune. For more info about enrolling in Microsoft Intune, see Enroll your device in Intune.

Microsoft正在对永久许可证的激活体验进行现代化改造。 从 2025 年 12 月 3 日起，传统的基于电话的产品激活自动化过程已从电话转移到在线。 客户将改用产品激活门户： 产品激活门户 新的数字工作流提供更安全、更可靠且用户友好的激活体验，并有助于防止欺诈。 虽然该过程已更新，但脱机激活 ...

Looking for a complete solution for single sign-on and mobile device management for Microsoft apps and other services too? The Enterprise Mobility Suite gives you a comprehensive solution for iOS, Android, Windows, Windows 10, and over 2,500 popular SaaS apps.

可以使用安全密钥作为组织中的无密码登录方法。 安全密钥是一种物理设备，它与唯一 PIN 一起使用以登录到工作或学校帐户。 由于安全密钥要求你拥有物理设备和只有你知道的内容，因此它被视为比用户名和密码更强大的验证方法。 使用安全密钥作为无密码身份验证方法目前以公共预览版提供 ...

After you install a Windows update released on or after November 15, 2022, you might receive error messages when you provision and install an app to a device enrolled with a third-party MDM service.

About digital signatures and certificates in Office, and buying a digital certificate from a certificate authority or create your own.