I just got an invitation from my colleague Wouter, giving me a link to download Xobni, a very useful Outlook add in for managing emails, contacts, etc.
"After a quick install, you'll see the new Xobni toolbar appear in Outlook - and suddenly information will become much easier to find. When a new email arrives, the sender's full communication history appears in the Xobni sidebar, including past conversations, attachments and contact details. Xobni also includes a blazing fast email search tool."
You can download the add in for free.