The scenarios are to be used as a
starting point to help assess where the servers should go, how many servers are needed, and what roles
are needed within the organization.
Microsoft recommends that server roles be installed in a particular order. Once all of the Schema and
domain preparation has been completed, the Exchange roles should be deployed in the following order:
1. Client Access Server role
2. Hub Transport server role
3. Mailbox server role
4. Unified Messaging server role
5. Edge server (this role can be deployed during any step, but will not be functional until after
the Hub Transport role has been installed)
Part I: PowerShell for Exchange Fundamentals
78
Single Server Deployment
For small organizations a single server containing the Client Access, Hub Transport, and Mailbox server
roles will be sufficient. The Exchange Server 2007 computer will be new to the existing Exchange
organization or could be a brand new deployment of Exchange. If there is an existing Exchange 2003
server, a new Exchange Server 2007 computer will have to be deployed to the organization, and
mailboxes and data will have to be migrated to it. A single server will work in a single site Active
Directory configuration. It does not provide any level of redundancy or high availability, but is useful in
a small office.
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