If Microsoft Outlook is your favorite email client application, or if you simply have to deal with it only at work (like myself), you should check out Xobni.
Xobni (Inbox reversed – cool?) is a search and social networking plugin for Outlook, offering a variety of features like:
– Fast email search
– Email statistics
– Email conversations
– Contact grouping / sorting and more.
Well it definitely sounds promising, you can download and try the beta version here.
Not sure yet? Here is a Xobni video demo: