As of today, Exchange 2013 Deployment Assistant URL still displays that that upgrading from Exchange 2007 or Exchange 2010 is “COMING SOON!!” This shows that how poorly the internal departments (Exchange Team) are coordinating.
So far, in my tests, I found no reasons to upgrade due to so many bugs, limitations, poor OWA design, PF management, and performance hits! Now that multiple roles are running on a single MB server, I noticed a major difference between the performance of Exchange 2010 box and Exchange 2013 box. All the updates are cosmetics (with poor ingredients I must add) and not much to gain. Did anyone notice that Exchange 2013 is actually more similar to Exchange 2003? (Including the removal of 0 with 1).