Ade Famoti, an Architect for Microsoft in Africa recently added MCA 2007 to his MCA in Exchange 2003! One of only 7 people worldwide to hold both those certs. There are some more MCA upgrades in the pipeline, but for now, Ade is lucky number 7!
Trivia note: Ade taught transport to the class I was in, four years ago. He blew the minds of everyone in the room on Exchange 2003 routing. I still to this day have no idea what a RAT is in relation to Exchange, but he does. Still, I passed the exam, so I guess I learned what I needed to! Thanks Ade!