I have installed Exchange Server 2007 in my enterprise. The front-end server has the Client Access Server (CAS) role installed and the back-end server has the Hub Transport and Mailbox roles installed. Is it possible to install a CAS role on the back-end server -- i.e., to have two CAS roles in one forest? I have an application that connects with IMAP protocol in my internal network and it doesn’t work with my front-end server.
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