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Microsoft® Exchange Server 2010: Best Practices by Joel Stidley, Siegfried Jagott

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Upgrading from and Coexisting with Exchange Server 2003

Because many organizations have not yet implemented Exchange Server 2007, upgrading from Exchange Server 2003 to Exchange Server 2010 is a very common upgrade scenario. As in any upgrade, unless you have a user base that you can move in a single, acceptable period of downtime, there will be a period of coexistence with the legacy (Exchange Server 2003) environment until all resources are upgraded to Exchange Server 2010. This section discusses the factors to consider when planning your coexistence strategy.

This section builds on the scenarios presented in Chapter 2. Contoso is a company of 750 users running an Exchange Server 2003 environment centralized in Seattle. A logical view of their ...

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