Microsoft Exchange Server 2013 consists 2 server roles (reminds me of the Exchange 2000/2003 front-end/back-end split)To download the preview version :http://technet.microsoft.com/evalcenter/hh973395Client Access server role.This role proxies connectivity for all clients, such as Microsoft Office Outlook, Outlook Web App, mobile devices, POP, and SMTP and also accepts mail from and delivers mail to other mail hosts on the Internet. Client access servers can be organized into Client Access server arrays.It includes two different components: the Client Access service and the Front End Transport
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