You no longer use your Email certificate for Enterprise Email. Mac users who choose to upgrade to Mac OS Catalina (10.15) (or higher) will need to uninstall all 3rd Party CAC enablers per https://militarycac.com/macuninstall.htm. Accessing OWA requires the installation steps below and an email account on that network.
to continue to Outlook. Email or phone. Can’t access your account?
DoD Login Portal:User Access. User Account. Password
MilitaryCAC provides CAC installation assistance; Find information regarding the Department of Defense Common Access Card (CAC)
Accessing DoD PKI-protected information is most commonly achieved using the PKI certificates stored on your Common Access Card (CAC). The certificates on your CAC can allow you to perform routine activities such as accessing OWA, signing documents, and viewing other PKI-protected information online.