According to a study conducted by Ferris Research in 2008 i Microsoft Exchange Server holds approximately 65 percent market share in email and communications across all organizations. In healthcare organizations with more than 5,000 employees, it enjoys 75 percent penetration; in telecommunications organizations with at least 1,000 employees, it does even better, garnering a 90 percent penetration rate. Small businesses, too, are particularly drawn to Exchange Server: In the Ferris Research survey, nearly all organizations with up to 49 employees currently use Exchange Server 2007.

With such a broad distribution across organizations of different sizes and throughout multiple industries, the effect of core changes on the Exchange Server 2010 architecture is significant when it comes to migration. It is no longer possible to simply replace existing installations and migrate mailboxes from one version to another. Instead, changes to Exchange Server 2010 architecture make it necessary to employ a migration strategy that includes re-evaluation of the supporting network architecture.

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