Migrating from Exchange Server 4.0 to Exchange 5.0—or from Exchange 5.0 to Exchange 5.5—is a relatively simple endeavor. However, when Exchange 2000 Server debuted, we faced a steep learning curve as we struggled to grasp the complexities of an Exchange 5.5—to—Exchange 2000 migration. You might think that a migration from Exchange 5.5 to Exchange Server 2003 would involve even more complexity, but the truth is that it's no more difficult than a migration to Exchange 2000 and, if anything, is slightly more straightforward.

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