Office 365 Message Encryption Viewer

Office 365 Message Encryption (OME) allows email users to send and receive encrypted messages. With the OME Viewer app, you can view and reply to OME encrypted messages, right from your iPhone or iPad.

After downloading OME Viewer, open the message in your email app, tap and hold the attachment, and choose 'Open in OME Viewer'.

Requirement: iOS 6+ (all devices)