One of the ‘new’ features in Exchange 2013 SP1 is SSL Offloading, although I can better say ‘re-introduced’ features since this was available in Exchange 2010 but not supported in Exchange 2013 RTM.
I’ve explained numerous time why you want to use SSL offloading in Exchange, but mainly because of performance reasons (load balancers typically have a dedicated chip for SSL decryption) and for SSL certificate management. Suppose you have 8 Client Access servers and *not* using SSL Offloading. In this case you have to manage the SSL certificate on each individual Client Access server. If you have an SSL offloading scenario you have only one SSL certificate to manage, and that’s the SSL certificate on the load balancer.