This from another forum. You need to side-load stuff to make it work, so proceed with caution (can't vouch for any of the links there, but it doesn't seem like anyone there has had issues... just giving proper warning here hehe).
Nine has no rival when it comes to Exchange. The Outlook app is nice, but it doesn't integrate with the rest of your phone like Nine does. Very well worth the 10 bucks (or the original 20, even!).