Front - end servers were used to provide the entry point of Simple Mail Transport Server (SMTP)
messages into the organization, OWA access, ActiveSync connectivity, as well as RPC/HTTP end point
termination. Exchange Server 2007 has spilt this into two separate roles to provide better performance
and increased security: Edge servers and Client Access Servers. Figure 3 - 1 shows the topology of a
standard deployment. This type of deployment would be for single site. If additional sites are added but
are too small to warrant their own Exchange servers, the remote offices would just connect to the CAS
and mailbox servers in this site. A single site is advantageous to reduce complexity and hardware costs,
but in the event of a network or site outage all messaging services will be impacted.
Chapter 3: Using PowerShell to Deploy Exchange Server 2007
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Figure 3-1
In a standard deployment a company would have two Edge servers deployed to provide the SMTP
connectivity to the Internet. The Edge servers will perform the message hygiene functions, mail relay,
and filtering. A minimum of two servers are required to provide redundant connections for internal and
external message flow.
The user - experience pieces ??” ActiveSync, OWA, and RPC/HTTP ??” have been rebranded and packaged
into the Client Access Server role.
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