I have looked over the Exchange 2007 and 2010 architecture posters and can't seem to find one for 2013.
This page has what I am referring to:
https://social.technet.microsoft.com/wiki/contents/articles/749.exchange-posters-visio-stencils-and-more.aspx
Is a poster in the works, not going to be available, or just not released yet? I can't seem to find one for 2013.