scalability and availability reasons it can be useful to separate the
various Exchange Server 2010 server roles onto different machines,
giving you dedicated Mailbox Servers, Hub Transport Servers, Client
Access Servers and Unified Messaging Servers.
The prerequisites for a
dedicated Exchange Server 2010 installation are exactly the same as for a
typical installation with multiple roles installed on one server. Just
make sure you follow the guidelines from Table 1 to install the proper parts of Internet Information Server for the server role you want.
When installing a
dedicated Exchange Server 2010 Mailbox server role, start the setup.exe
application from the installation media and, when reaching the
"Installation Type" window, you should now select the "Custom Exchange
Server installation." At this stage you'll be able to select the Server
Role you want (such as, for example the "Mailbox Role" as can be seen in
Figure 1. Installing a dedicated Exchange Server 2010 Mailbox Server role.
It is also possible to
install a dedicated server role using the command line setup. When
entering the setup command, just use the appropriate switch to enter the
roles you want to install. For example, if you want to install the
Mailbox Server role using the command line setup, enter the following