The Apple iPhone TrustX app can be used to authenticate yourself when accessing protected email through Outlook or other email clients, as well as to directly access your email using built-in functionality.
To download the TrustX app (Currently awaiting App Store approval):The registration and enrollment process is designed to be fast and intuitive. However, if you’d like to review information about the enrollment process in advance, you may read the iPhone Enrollment Guide or view a short video.