How to Use Common Access Card (CAC) Certificates with Azure AD and Outlook
Question details
The user needs to configure government-issued Common Access Card (CAC) certificates to encrypt and digitally sign emails in Outlook using Azure Active Directory, specifically without an on-premises Active Directory.
- Product
- Microsoft Outlook
- Device & OS
- not provided
- Scenario
- Setting up secure, encrypted, and digitally signed email communications in an organization utilizing a cloud-only Azure AD environment.
- Observed behavior
- The user requires the proper configuration steps and guidance to ensure Outlook correctly recognizes CAC certificates for authentication and email security.
Ensure you have global administrator access to your Azure Active Directory tenant and that your users have valid Common Access Card (CAC) smart cards with compatible card readers installed on their devices.
Consult the Microsoft Azure AD Community for Certificate-Based Authentication
Since configuring CAC certificates in a cloud-only Azure AD environment requires specific tenant-level configurations, seeking expert guidance from Azure specialists is the most effective approach.
Certificate-Based Authentication (CBA) in Azure AD without an on-premises CA involves uploading the public keys of your trusted authorities directly to Azure.
Outlook must then be correctly configured on the endpoint to read the smart card credentials from the Windows certificate store for S/MIME encryption and digital signing.
Open your web browser and navigate to the official Microsoft Q&A platform to seek enterprise-level support.
Filter the topics by selecting the 'Azure Active Directory' section. This ensures your inquiry is routed to Azure AD specialists who handle certificate-based authentication.
Explain your specific scenario: you are using Azure AD without an on-premises Active Directory or CA, and you need to configure government-issued CAC certificates for encrypted Outlook email.
Review the documentation and deployment steps provided by the community experts to set up Azure AD CBA and configure S/MIME for Outlook.
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Frequently Asked Questions
Can I use a Common Access Card (CAC) for Outlook on the web (OWA)?
Yes. If Azure AD Certificate-Based Authentication (CBA) is correctly configured for your tenant, you can use a CAC to authenticate into Microsoft 365 web applications, including Outlook on the web.
Does Outlook need a special plugin to read CAC certificates for email encryption?
Outlook natively supports S/MIME for encrypting and signing emails. However, your operating system must have the correct middleware installed to read the smart card and expose the certificates to the Windows certificate store.
What if my organization doesn't have an on-premises Certificate Authority?
Azure AD supports cloud-based Certificate-Based Authentication. You will need to upload your Root and Intermediate CA certificates (such as the DoD root certificates) directly into your Azure AD tenant to establish trust.
