Chapter 2. Plan, install, configure, and manage client access
The Client Access server (CAS) role in Exchange 2013 has evolved to account for changes in newer hardware, such as cheaper and more powerful central processing units (CPUs). The CAS role in Exchange 2013 is designed for simplicity of scale. Unlike previous versions of Exchange server, Client Access in Exchange 2013 is loosely coupled, meaning it’s no longer responsible for rendering mailbox data. All processing and activity for a given mailbox occurs on the Mailbox server that holds the active copy of the mailbox. Because all of the data processing is carried out by the Mailbox server role, it eliminates concerns of version compatibility between the CAS and the Mailbox server.
Because ...
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