Enable Support for Administrative Groups
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It s time to start working hands-on with administrative groups so we can see how they operate We ll begin by enabling support for administrative (and routing) groups in System Manager This procedure simply reveals the two default containers created when our first Exchange 2000 server Box14 was installed Administrative (and routing) groups are hidden by default in System Manager to simplify the initial task of administering a new Exchange 2000 deployment To make them visible, start System Manager, rightclick on the Root (organization) container in the directory hierarchy or console tree (left-hand pane), and select Properties On the General tab, select Display Administrative Groups (Figure 121) We won t bother displaying routing groups at this juncture because we plan to discuss them in more detail in 21 Click OK to close the Properties Sheet and enable support for administrative groups in System Manager A message box appears with the test, You will need to exit and restart the Microsoft Exchange System Manager to view the results of these changes Click OK and exit System Manager
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Figure 121 Enabling support for administrative groups in System Manager
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Restart System Manager and you can see that the top-level containers in the console tree have changed (Figure 122) Specifically, instead of the original six top-level containers (Global Settings, Recipients, Servers, Connectors, Tools, and Folders), you now have only four (Global Settings, Recipients, Tools, and a new container called Administrative Groups) The three missing top-level containers (Servers, Connectors, and Folders) have simply been moved so that they are within the First Administrative Group container, which is within the new Administrative Groups top-level container Nothing has actually changed in Active Directory objects are merely displayed differently in System Manager
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Change the Operations Mode
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To use the full power of administrative groups your Exchange servers need to be running in native mode Exchange 2000 has two operations modes: native and mixed These modes are global settings and apply to
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Figure 122 The Administrative Groups container in System Manager
the entire Exchange organization, not to individual servers Let s take a moment to examine these two modes of operation
The terms native mode and mixed mode in Exchange mean something different than the same terms in Windows 2000 In Windows 2000, mixed mode means support for downlevel Windows NT backup domain controllers, and native mode means all the domain controllers are running Windows 2000
When you install your first Exchange 2000 server to deploy a new Exchange organization, this server by default is running in mixed mode The advantage of mixed mode is its interoperability with downlevel Exchange 55 and Exchange 50 servers, so you typically leave your Exchange 2000 deployment running in mixed mode until your migration from Exchange 55 is complete The disadvantage of mixed mode is that it makes administrative groups in Exchange 2000 effectively the same as sites in Exchange 55, that is, it enforces a one-to-one mapping between administrative and routing groups In other words, you cannot create multiple routing groups within an administrative group if you are running in mixed
mode each administrative group can contain only one routing group Mixed mode therefore forces the logical and physical topologies of the messaging system to be identical Another disadvantage of running in mixed mode is that you cannot move mailboxes from servers in one administrative group to servers in another In other words, maintaining interoperability with downlevel Exchange servers by remaining in mixed mode severely limits the administration options
Switching the Exchange 2000 organization to native mode provides much more flexibility in configuring and administering your messaging system Native mode allows you to create multiple routing groups for each administrative group, effectively allowing you to separate the physical and logical topologies of your messaging system and configure them differently for optimum performance and manageability You can easily move mailboxes between servers in different administrative groups The disadvantage of running in native mode is that, if there are any remaining Exchange 55 or Exchange 50 servers around, your Exchange 2000 servers won t even see them and you will be unable to migrate them You should only switch from mixed to native mode when you have migrated all your downlevel Exchange servers to Exchange 2000 And you should be aware that the switch from mixed to native mode is an irreversible step