Clean & Beautiful — needs to support Exchange server natively

The Unibox interface is refreshing, simple and very easy to use. It will very likely become my default mail client, but not until Exchange is supported. The application needs to support Exchange natively (not only via IMAP), and I would prefer a few more preference options to customize what is displayed by default. For example, although it is easy to see when there are multiple recipients, I cannot have the recipients displayed by default, and have to click an icon for every message.

Eric Tietz about Unibox, v1.2.1