Mixed Mode Versus Native Mode

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The Exchange Server 2003 installation defaults to having Exchange Server 2003 running in mixed mode. Because this chapter deals with purely Exchange Server 2003 environments, you will likely want to switch over to native mode. Native mode offers many features that mixed mode does not.

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Mixed mode is used when there are Exchange 2000 Server or Exchange Server 5.5 servers present.

Native mode is used when all Exchange servers are running Exchange Server 2003. Native mode is also possible if Exchange 2000 servers are in use.


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Exchange modes do not correspond to Windows 2000 AD modes or Windows Server 2003 functional levels. This is a common misconception that Microsoft might play on in the exam.


We discuss mixed mode in more detail in Chapter 3, which deals with installing Exchange Server 2003 in a preexisting Exchange environment. The advantages of running your Exchange Server 2003 environment in native mode include the following:

  • The default routing protocol is SMTP.

  • Mailboxes can be moved between administrative groups.

  • Single routing groups can be made up of Exchange Server 2003 servers from more than one administrative group.

  • Exchange Server 2003 servers can be moved from one routing group to another.

  • Query-based distribution groups can be implemented.

  • Routing bridgehead servers use 8-bit MIME rather than 7-bit, reducing bandwidth utilization.

Exchange organizations can only be switched from mixed mode to native mode. They cannot be switched from native mode to mixed mode. To perform the switch, from the Exchange System Manager, right-click the organization, click Properties, and select Change Mode under Change Operation Mode. You then need to restart the Microsoft Exchange Information Store Service on all Exchange Server 2003 systems within the domain to have all available benefits of the shift to native mode. As with other Windows services, this service can be restarted via the Services console (services.msc).

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    Implementing and Managing Exchange Server 2003 Exam Cram 2 Exam 70-284
    MCSA/MCSE Implementing and Managing Exchange Server 2003 Exam Cram 2 (Exam Cram 70-284)
    ISBN: 0789730987
    EAN: 2147483647
    Year: 2004
    Pages: 171

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