Sorry guys but Exchange 2013 has been a massive flop from my perspective. I have worked with Exchange as an integrator/consultant for 10+ years and I have had 1 customer that is serious abut upgrading to 2013. The rest dont see any reason to move from
2010 as they see 2013 as an absolute mess. I think that focusing LESS on O365 development of Exchange and more on on-prem for the next release. Please start releasing things when they are ready not when you have to, that is the perception from my clients,
they would rather wait for a release (CU, SP, full version) than to have a rushed buggy release. The only time I see Exchange servers at the moment is when I deploy a 2010 UM server for Lync and 60% of my work load was Exchange consulting and deployment.
Microsoft