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Microsoft Exchange Server 2003 Deployment Guide- P21:Your Exchange Server 2003 deployment plan should reflect your understanding of how Exchange and Microsoft Windows Server™ operating systems interoperate. It should encompass the relationships between Windows Server 2003 and Microsoft Windows® 2000 Server sites and domains, domain controllers, global catalog servers, and Exchange 2003 administrative and routing groups. | 201 Switching from Mixed Mode to Native Mode Because Exchange Server 2003 is structured to take advantage of Active Directory functionality there are some limitations when Exchange Server 2003 coexists in the same organization with Exchange Server 5.5. When Exchange Server 2003 servers coexist with Exchange Server 5.5 your organization must run in mixed mode. Running in mixed mode limits the functionality of Exchange Server 2003. Therefore after migrating from Exchange Server 5.5 to Exchange Server 2003 it is recommended that you switch from mixed mode to native mode. This section discusses the advantages of a native-mode Exchange organization and provides the steps to switch from mixed mode to native mode. You are ready to change your Exchange Server 2003 organization to native mode if Your organization will never require interoperability between your Exchange Server 2003 servers and Exchange Server 5.5 servers in the same organization. Your Exchange Server 5.5 servers exist in an organization that is separate from your Exchange Server 2003 servers. 202 Note After you switch your Exchange Server 2003 organization from mixed mode to native mode you cannot switch the organization back to mixed mode. Make sure that your Exchange Server 2003 organization will not have to interoperate with Exchange Server 5.5 in the future before you switch from mixed mode to native mode. First you should determine in which mode your Exchange organization is currently running. For detailed steps see How to Determine if You Are Running Exchange in Mixed or Native Mode. Exchange Server 2003 Considerations for Mixed and Native Mode As mentioned earlier after you migrate from Exchange Server 5.5 to Exchange Server 2003 by default your organization runs in mixed mode. Running Exchange Server 2003 in mixed mode has the following disadvantages Exchange Server 5.5 sites are mapped directly to administrative groups. Administrative groups are mapped directly to Exchange Server 5.5 sites. 203 .
