Edge cannot read or send encrypted (S/MIME) email

windows

Symptoms

OWA / Enterprise Email opens in Edge, but the S/MIME control will not install and encrypted messages will not decrypt.

Likely cause

OWA's S/MIME implementation depends on ActiveX, which Edge does not support.

Fix

1. Use 32-bit Internet Explorer 11 for any encrypted message read/send. 2. Install the S/MIME control from OWA > Options > See All Options > Settings > S/MIME. 3. On Windows 11 (no IE11 available) there is no native S/MIME path - wait on Microsoft's replacement or use a government workstation.

Sourced from militarycac.com. Rewritten for clarity.

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