There are sites two sites within each child domain. Edge servers are
deployed outside of the domain at each of the large sites. A failure at one site will not affect the ability to
send and receive email from the Internet for the entire company. As required for message routing and for
user accessibility, wherever there are mailbox servers there are also CAS and Hub servers. Smaller sites
such as sites 2 and 4 require only a global catalog server at the site. These smaller sites connect to the
larger office either via Outlook Anywhere, or natively through MAPI. Smaller office deployments may
be numerous and each remote office may not be able to justify the cost of having Exchange servers at
every site. A deployment of this model results in a hub and spoke topology. When a smaller office grows
in capacity to the point where it needs its own Exchange, then new Exchange servers can be configured,
and the user mail migrated.
Chapter 3: Using PowerShell to Deploy Exchange Server 2007
81
Figure 3-2
Summary
This chapter focused on preparing for and deploying Exchange Server 2007. Exchange Server 2007 is the
first Microsoft product to ship that is 64 - bit only. The hardware now must be 64 - bit capable, just as the
software. One of the goals of Exchange Server 2007 was to reduce the overall I/O to the disk subsystem.
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