The first and most important step in the installation process is planning your organization. How much planning you do before installing Microsoft Exchange Server depends on your organization's requirements and resources. For example, a smaller organization with only one server and a few users requires less planning than a larger organization with many servers. Regardless of how large your organization is, thorough planning will make your rollout of Microsoft Exchange Server more efficient. For more information about how to plan a rollout of Microsoft Exchange Server, see Microsoft Exchange Server Concepts and Planning.