When installing the application on a Microsoft Exchange 2013 server deployed in the Client Access Server (CAS) role only, an additional component is available in the list of components that can be installed: CAS Interceptor. This component is designed to improve the accuracy of spam detection. It is recommended for installation on all Microsoft Exchange 2013 servers deployed in the Client Access Server (CAS) role only.
This component is installed automatically together with the Anti-Spam component on Microsoft Exchange 2013 servers deployed in the Mailbox role (if you choose to install Anti-Spam).
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