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This article describes issues that you should consider if you want to move an Exchange organization to an Exchange 2000 native-mode environment.
NOTE: After you move an Exchange organization to an Exchange 2000 native-mode environment, it cannot be switched back to a mixed-mode environment.
When to Switch an Exchange Organization to a Native-Mode EnvironmentAfter you switch an Exchange 2000 organization from mixed mode to native mode, the organization is no longer interoperable with Microsoft Exchange Server 5.5-based systems. Exchange organizations operating in native mode can contain servers that are running Exchange 2000. You can switch an Exchange organization to native mode only when all of the Exchange-based servers in the site are running Exchange 2000.
You should change your Exchange organization to native mode in the following scenarios:
Advantages of Native ModeRunning an Exchange organization in native mode gives you the full flexibility of Exchange 2000 when you manage your messaging system.
For additional information about the advantages of Native Mode, click the article number below to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/270143/EN-US/ )XADM: Mixed Mode vs. Native Mode