Microsoft has launched Outlook Web Apps for iPhone and iPad for download.Both versions require a current subscription to Office 365 with the latest update of Exchange Online to work.
Organize your email quickly with Conversation View, Mark as Junk, Flag, and Categories
Quickly search or browse email in all folders including Outlook Favorites
Schedule meetings using attendee free/busy and room finder
View shared calendars including delegate support
Use your voice to look up a contact or bring up your schedule
Remote wipe erases only your corporate data in OWA for iPhone and leaves your personal data on the device alone
Separate passcode for OWA for iPhone provides an additional layer of security