I just passed my review board and received my certification!!
What is the certification all about?
"The goal of the Messaging Architect Program, the first Product or Depth Architect program under the Microsoft Certified Architect umbrella, is to provide the world's top tier training and certification on Microsoft Exchange Server to build a community of trusted messaging architects who can successfully address the most complex customer requirements."
This is a little different than a MCSE, or other similar certifications. This program has strict entrance requirements and requires a lot of experience prior to entrance. Currently, there are only 77 certified messaging architects in the world!
Want to learn more, check out http://www.microsoft.com/learning/mcp/architect/messaging/default.mspx
Congrats! I can imagine how hard it is - I will attend the Architect Training in November... I hope I'll be as successfull as you were...