1. Download the Office 365 Message Encryption (OME) application from an approved store:
2. Open the attachment named: message.html from the received email.
It will open in the OME Viewer:
3. At this point you have two options to open the message.
A. If you have a Microsoft account (an account that lets you sign into Microsoft services such as OneDrive, XBox Live, etc), click and go through the sign in process. The message body will be displayed:
B. If you do not have a Microsoft account you can choose to have One-time pass code sent to you. Click on the Use a one-time passcode link.
You will receive an email from Microsoft with your One-Time passcode.
4. Enter the passcode provided.
The message will be displayed.