Outlook Social Connector is a great feature installed with Outlook 2010 however you can now get this as a add-on for Outlook 2007.
The social connector is one other way to keep connected with your clients in a more personal way.
Get it now: http://www.microsoft.com/en-us/download/details.aspx?id=7985
Frequently asked questions about Outlook Social Connector
http://support.microsoft.com/kb/2276763
Learn more about Outlook Social Connector and privacy
http://office.microsoft.com/en-us/outlook/learn-more-about-outlook-social-connector-and-privacy-HA101880243.aspx