http://developers.de/blogs/damir_dobric/archive/2009/02/04/inversion-of-control-in-5-minutes.aspxImagine You have classes that have dependencies on services or components whose concrete type is specified at design time. To replace or update the dependencies, you would have to change your classes' source code, The concrete implementation of theenCommunityServer 2008 SP1 (Build: 30619.63)