[http://blogs.technet.com/cfs-file.ashx/__key/communityserver-blogs-components-weblogfiles/00-00-00-31-06-metablogapi/Pre_2D00_E15_2D00_Environment_5F00_thumb_5F00_72D46C00.png]
Client Connectivity in an Exchange 2013 Coexistence Environment – Exchange Team Blog – Site Home – TechNet Blogs The official Microsoft Exchange blog

http://blogs.technet.com/b/exchange/archive/2014/03/12/client-connectivity-in-an-exchange-2013-coexistence-environment.aspx