The main cause is the S/MIME control not being installed correctly, but it can also happen due to browser compatibility issues or security settings blocking the control. Now that you know the causes, let’s discuss the solutions
1. Add Your OWA Page to Trusted Sites and Use Compatibility View
Making sure your browser sees the OWA page as secure can remove blocks on the S/MIME control. Adding the OWA page to Trusted Sites lets the browser run needed scripts and plugins. Enabling Compatibility View helps the page work with older features, allowing the S/MIME control to function smoothly.
2. Install S/MIME
Installing the S/MIME control allows your email client to handle encrypted or signed messages. It decrypts secure emails, enabling them to display and function correctly in supported browsers. Proper installation fixes the compatibility issues causing the error.
3. Run Internet Explorer as an Administrator
Running Internet Explorer as an Administrator allows the S/MIME control to install or execute tasks that standard permissions might block. This step helps the browser bypass certain restrictions, ensuring secure email content displays correctly.
4. Deselect a Checkbox in Internet Options
Sometimes, hidden browser settings can affect S/MIME functionality. Unchecking “Do not save encrypted pages to disk” in Internet Options allows the browser to cache needed encrypted data, enabling S/MIME to work properly.
