Client Throttling Policies are used to manage client access performance by stipulating, for example, the number of concurrent connections for each client access protocol, the percentage of time that a client session can use to perform certain operations, and so on. There is a default client throttling policy named GlobalThrottlingPolicy_<GUID> with a throttling scope of Global that is perfectly adequate to manage the load placed on client access services for most environments. However, if this is not the case for your environment, you can modify this default policy or create additional custom policies to meet your requirements.
Client throttling policies are available for ActiveSync (EAS), Exchange Web Services (EWS), Outlook on the web (OWA), and RPC Client Access (RCA), among a few others. At the time of writing this book (Exchange 2016 CU5...
