I'm nearing the end of the training for Exchange 2003 (70-284) exam. I will be taking the exam in the next few weeks. Completing this exam will earn me the MCSA: Messaging credential. I'm looking forward to that.
I haven't taken any practice tests yet, but my notes already span over 15 pages long so I think it will take me at least a week to get some decent practice test scores. I will also mess around with some Exchange VMs over the weekend to ensure I can actually do what I've been training to do.