If you update Windows 8 to Windows 8.1, Microsoft is also going to give you Outlook 2013 RT. In the post they also say:
Outlook 2013 RT will be available on Windows RT tablets as part of the free Windows 8.1 update coming later this year.
Incredible news for users; but even more, Microsoft has to be the only company with the balls to offer a full productivity application in an Operating System update. I see that process backfiring when the time comes for support calls. Users today are unnecessarily hooked on Outlook’s interface (which is why a Metro version of it would never work).