Chivalry1 wrote: » I would start with Exchange 2007. Since most companies are presently on or moving towards implementing Exchange 2007.
Chivalry1 wrote: » I would still obtain the Exchange 2007 certification. While these companies are migrating from Exchange 2007 it would be good to have a firm understanding of 2007. And be able to explain the difference between 2007 and 2010.