I’ve been playing with Xobni (Inbox backwards) for a week or so.
http://www.xobni.com/

It’s a fantastic plugin for Outlook.  So slick.  The best search for email I’ve seen, and an automated contacts list (who keeps theirs up to date manually?  honestly?).  What more do you need?

They’ve proved Microsoft are years behind the curve (ok, I haven’t tried 2007 – but they haven’t shown me why I should pay, again).  And they’ve proved (like many Web2.0 companies), that Indie bands haven’t used up all the cool band names yet.

Let me know if you need an invite.  I’ve got 1 left.