It was on December 2006 when I first looked at this new framework on a developer lab at Redmond. I'm a big supporter of CAB as you may noticed if you read this blog and that is why I was invited. They want feedback. Acropolis grabbed many concepts and patterns that were successful in CAB, so people who invested in CAB and/or SCSF will have a seamless migration path and will understand Acropolis without too much hassle. Read this post from Glenn for more information on the future of CAB/SCSF.