1. Overview
(a) Sites are logical groupings of one or more Exchange server. Even though resources reside on different server in the site, the site groups all those resources without reference to their locations. This grouping makes using resources in the site very easy. For example, let us say that a certain mailbox physically resides on site server A. that site server is called the mailbox home server. Senders do not need to know the physical location of the mailbox in order to send messages to it. They simply see the mailbox in the site listing, and send it a message. The same principle applies to public folders in a site. The particular server a public folder is stored on is of no concern to the users wanting to access it. They simply see the public folder listed in their site and access it. This is called location transparency. From the user’s perspective a site creates a transparent messaging environment.
(b) Exchange server comprises the final main structure in the Exchange hierarchy. These computers run the Windows NT server operating system and the Exchange server software. The Exchange servers are the physical location for mailboxes, folders, and other data and information for the site. Individual servers, while inheriting certain configuration parameters from the site (the parent), can also be individually configured. For example, even though recipients can be managed at the site level, they can also be managed at the server they were created on, their home server. All Exchange objects, as well as all related process, are created and managed by the software components that make up the Exchange product.
2. Exchange Server Core Components. The Exchange components are executable programs that perform the exchange functions. Some are in the form of EXE files, others are in the form of Dynamic Link Libraries (DLLs). They are referred to as core components because they are necessary for Exchange to be operational. They are also referred to as services, because they run as services on the Microsoft Windows NT server operating system. The core components include the following :-
(a) Directory Service (DS)
(b) Information Store (IS)
(c) Message Transfer Agent (MTA)
(d) System Attendant (SA)
3. Exchange Server Additional Components. The additional components also called as Optional Components. As the name implies, are not necessary for the basic operation of Exchange. But these components could be needed for additional functionality in your Exchange environment. Optional components include the following :-
(a) Connectors or gateways
(b) Outlook Web Access
(c) Chat Service
(d) Scripting Agent
(e) Key Management
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