Microsoft launched the Outlook Web App for iPhone and iPad today.
Here is a detailed description:
IMPORTANT: You need to have the latest update of Office 365 for business to use this app. If you’re not sure about your account status, please contact your IT department before installing.
With OWA for iPhone you can:
Get work done faster with email
Organize your email quickly with Conversation View, Mark as Junk, Flag, and Categories
Quickly...
