Outlook Web App Customization
http://msdn.microsoft.com/en-us/library/bb891803.aspx
http://technet.microsoft.com/en-us/library/aa996029.aspx
http://technet.microsoft.com/en-us/library/aa996007.aspx
Mail apps for Outlook
http://msdn.microsoft.com/en-us/library/exchange/fp161135.aspx
http://stackoverflow.com/questions/724117/outlook-web-access-plugin-development
