Instead, you’ll have to configure the browser to install it automatically by deploying a Registry value or Group Policy. You can recognize it by the new icon shown on the right, instead of the traditional blue “e” icon.Īs mentioned, the Microsoft S/MIME extension can’t be installed from the browser store like other extensions. This guide applies to the new Microsoft Edge which is based on the same rendering engine as Google Chrome.

Step 4: S/MIME settings in Outlook on the Web (OWA).

Step 3: Download and install the S/MIME control.

Infobar message when trying to open an S/MIME message in OWA.

This guide explains how you can manually install or deploy the Microsoft S/MIME Control for Outlook on the web. However, adding the required extension isn’t (currently) possible via the traditional means of using the Chrome Web Store or the Microsoft Edge Addons page. S/MIME support for Outlook on the Web (OWA) used to be only available in Internet Explorer but it is now also possible to add this to Google Chrome and the new Microsoft Edge browser.

Microsoft edge extensions for webclient