The question came to mind during my analysis of a recent market study sponsored by Metaswitch Networks and Edgewater Networks. Their research focused on the broader VoIP opportunity, but there was some coverage of UC as well, which I distilled into a post for UCStrategies. That sparked a lot of interest, so we expanded our efforts and did a podcast about it.
There are many angles to explore here, and I think we covered 'em all. I'll let you be the judge of that, so here's the link, and I hope you give it a listen.