Have been using this for around a month now, after being invited by a certain Mr Brewski. It’s a really nifty little bit of kit, aslong as its not crashing outlook. Which does seem to happen, hopefully future updates etc will make it a lot more stable. It gives you a sidebar list of everything you need relating to the person who sent you the email you are viewing, the most useful personally is the list of shared files.

Information stolen from Mashable, read it here.