I came across the user contact card details in Outlook 2010 and was pretty impressed with the "Organization" tab. It gives you a snapshot of where you stand in the organization chart. It shows details like your manager, your manager’s manager and so on…
It becomes really handy if you want to escalate an issue or want to copy your manager’s manager in a sensitive email.
In previous versions of Outlook, you will have to open up a number of windows to get the same info. As this is a feature of Outlook 2010, it will work against both 2007 & 2010 mailbox.