Pre-requisites: Visual Studio Tools for Office runtime 3.0. Make sure your Visual Studio IDE is able to open Outlook 2007 add-in projects.
 
Just run the attached add-in project from your visual studio or build a setup project and install the setup. The setup should install Outlook add-in on your machine. You should have registry editing rights for the add-in to install and load itself successfully with Outlook.
 
Once the add-in is installed, see the magic when you receive a new mail containing names of companies, persons, cities. Courtesy: http://www.opencalais.com. This is useful when you want to know more about texts in your mails without actually Googling it.
 
Imagine you get a mail containing the name of the city you don’t know about (but OpenCalais knows it), you get the semantic info of that city and you can navigate to its details (wiki links etc from OpenCalais linked data page). All this happens from your outlook client main window.