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With Microsoft Exchange Server, you can administer all servers in your company from a central location, whether your company is small or spread out across a large region. The Microsoft Exchange Server Administrator program can run on a Microsoft Windows NT Server computer or a Microsoft Windows NT Workstation computer.
The largest administrative unit in Microsoft Exchange Server is the organization, which encompasses all servers that provide the messaging infrastructure for your company. Generally, a company has just one organization.
All servers in an organization are grouped together into sites. A site is a group of servers that share the same directory information and can communicate over high-bandwidth, permanent, and synchronous connections. All directory changes in a site are updated and replicated automatically. If you have the appropriate permissions, you can fully administer the site where you are logged on and view all other sites in the organization.
Within a site, you can group servers into locations. A location is a group of servers connected across a high-bandwidth network. Although you do not need to assign servers a location, both public folder access and mail routing will take advantage of location information if it is provided.
The Administrator program is a graphical interface that you use to configure and maintain your organization's sites and servers from a single location.