https://blogs.technet.microsoft.com/exchange/2016/09/20/released-september-2016-quarterly-exchange-updates/
Exchange 2016 CU3 finally gets a feature that makes it worthwhile to upgrade (for DAG installations): Read From Passive. Also Server 2016 support and .NET 4.6.2 support (only on Server 2016). https://support.microsoft.com/en-us/kb/3152589 Exchange 2013 CU14 gets some bug fixes. https://support.microsoft.com/en-us/kb/3177670
