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Microsoft Exchange Web Services
 proxy support

Microsoft Exchange Web Services
 (EWS) lets client applications communicate with the 
Microsoft Exchange Server
 using SOAP messages sent by HTTP. Proxying occurs when a client access server (CAS) role sends traffic to another client access server role. For example, 
  • CAS to CAS communication between two 
    Microsoft Active Directory
     sites
  • CAS to CAS communication between 
    Microsoft Exchange Server
     2010 and 
    Microsoft Exchange Server
     2013 
The following CAS protocols and services are proxy enabled:
  • Microsoft Exchange Web Services
     (EWS) and the availability service (part of EWS)
  • Microsoft Exchange ActiveSync
     (EAS)
  • Microsoft Outlook Web Access
     (OWA) and Exchange Control Panel (ECP)
  • POP3 / IMAP