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Microsoft® Exchange Server 2003 Administrator's Companion by Walter Glenn, Bill English

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Chapter 3. Understanding Exchange Server Routing Architecture

One of the most significant differences between Microsoft Exchange Server 5.5 and Microsoft Exchange Server 2003 lies in the basic architecture of an Exchange system. The message routing topology in Exchange Server 5.5 is based on sites. As you’ll recall, a site is a logical grouping of servers that enjoy permanent, high-bandwidth connectivity. Architecturally, each site defines three distinct boundaries: the boundary for single-hop routing, the administrative unit, and a namespace hierarchy in the directory structure.

In Microsoft Exchange 2000 and ...

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