Outlook Object Model changes : Outlook 2010 Object Model and its Earlier Versions?

With respect to my previous blog post, i want to add more information regarding the Outlook Object Model changes. Being Messaging developer, it’s a must for us to understand and keep in-track, Outlook 2010 Object Model changes available since earlier versions. I request you to refer the MSDN article which summary of the changes in the Microsoft Outlook 2010 object model as compared to earlier versions of Microsoft Office.