Red X In OWA With IE?If you are finding that using OWA you get a Red X blocking the message body read on to find the solution to this problem.
By default, IE can’t handle the SMIME messages in the emails as a security feature. To enable it, you have to download it manually to prevent the red X in OWA.
In OWA click on Options
Scroll down to E-Mail Security
Click the Download button
A popup will ask if you want to install some controls
Click Yes and Ok to everything
Once done, restart the browser and the red X will no longer block the message body