Microsoft Exchange Server 2003 Deployment Guide- P31 doc

Switching from Mixed Mode to Native Mode Because Exchange 2000 Server and Exchange Server 2003 are structured to take advantage of Active Directory functionality, there are some limitati

Switching from Mixed Mode to Native Mode

Because Exchange 2000 Server and Exchange Server 2003 are

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 2000 Server or 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 that are necessary 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

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, however, 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

 Routing group membership consists only of servers that are installed

in the administrative groups

 You cannot move Exchange Server 2003 servers between routing groups

 Because many Exchange Server 2003 features are available only when you run your Exchange Server 2003 organization in native mode, it

is recommended that you switch from mixed mode to native mode

Running Exchange Server 2003 in native mode has the following

advantages:

 You can create query-based distribution groups A query-based

distribution group provides the same functionality as a standard

distribution group However, instead of specifying static user

memberships, with a query-based distribution group you can use an

LDAP query to build membership in the distribution group dynamically For more information about query-based distribution groups, see

"Managing Recipients and Recipient Policies" in the Exchange Server

2003 Administration Guide

 Your routing bridgehead server pairs use 8BITMIME data transfers instead of converting down to 7-bit This equates to a considerable

bandwidth saving over routing group connectors

 The Exchange store in Exchange Server 2003 ignores and removes zombie access control entries (ACEs) from the previous Exchange

Server 5.5 servers in your organization automatically These zombie

access control entries are security identifiers from previous Exchange Server 5.5 servers that have been removed from your organization

 Routing groups can consist of servers from multiple administrative groups

 You can move Exchange Server 2003 servers between routing groups

 You can move mailboxes between administrative groups

 Simple Mail Transfer Protocol (SMTP) is the default routing protocol

Removing Exchange Server 5.5 Servers

Before you can switch from mixed mode to native mode, you must

remove all Exchange Server 5.5 servers in your organization This

section guides you through the process of removing the Exchange

Server 5.5 servers from your organization

Removing an Exchange Server 5.5 Server

Before you remove an Exchange Server 5.5 server from your site, verify that there are no mail connectors on the server If there are, open a

connector on another server in the site, and then verify mail flow Next, remove the connectors on the server to be deleted Retest message flow For more information about removing your Exchange Server 5.5

connectors, see the Exchange Server 5.5 Help

For detailed steps about how to remove Exchange Server 5.5 servers,

Organization

Note:

Ensure that the account to which you are logged on has Exchange Full Administrator permissions, as well as Exchange Server 5.5 service

account administrator permissions for the site

Important:

If this is the first server in the site to be removed, see Microsoft

Knowledge Base article 152959, "XADM: How to Remove the First

Exchange Server in a Site"

(http://go.microsoft.com/fwlink/?linkid=3052&kbid=152959)

Removing the Last Exchange Server 5.5 Server

Before you can switch from mixed mode to native mode, you must

remove all Exchange Server 5.5 servers in your organization This

section guides you through the process of removing the last Exchange Server 5.5 server from your organization

For detailed steps, see How to Remove the Last Exchange 5.5 Server from Your Exchange 2003 Organization

Removing Site Replication Service

Site Replication Service (SRS) is a component that exchanges

configuration information between Active Directory and the directory in Exchange Server 5.5 In Exchange Server 5.5, SRS is necessary

because Exchange Server 5.5 configuration information can only be

exchanged between Exchange Server 5.5 servers and Exchange

Server 5.5 directories—not with Active Directory SRS mimics an

Exchange Server 5.5 directory so that other Exchange Server 5.5 servers can replicate information to it Using the configuration connection

agreement created by Exchange Setup, Active Directory Connector

replicates the configuration information in SRS into Active Directory

SRS runs only in a mixed-mode Exchange administrative group SRS also performs additional functions, such as detecting and reacting to

directory replication topology changes You cannot switch from mixed mode to native mode until you have removed all instances of SRS

SRS is enabled automatically in two situations:

 On the first Exchange 2000 Server or Exchange Server 2003

computer that you install in an Exchange site that is running only

Exchange Server 5.5 servers

 When you in-place upgrade to Exchange 2000 Server from an

Exchange Server 5.5 server that is the directory replication bridgehead server for a site

For detailed steps about how to remove Site Replication Service, see

How to Remove Exchange SRS After you complete these steps, you can convert the Exchange organization to native mode

Switching to Native Mode

For detailed steps about how to switch from mixed mode to native mode, see How to Convert from Mixed Mode to Native Mode in Exchange

After you switch your Exchange Server 2003 organization from mixed mode to native mode, you cannot switch the organization back to mixed mode Before you perform the following procedure, make sure that your Exchange Server 2003 organization will not have to interoperate with Exchange Server 5.5 in the future

To take full advantage of Exchange native mode, you must restart the Microsoft Exchange Information Store service on all of the Exchange servers in your organization You do not need to restart all of the

Microsoft Exchange Information Store services simultaneously, but you must restart the service on each server for the server to take advantage

of all Exchange native mode features Restart the service on your servers after the change to native mode has been replicated to your local

Windows domain controller

For detailed steps about how to restart the Microsoft Exchange

Information Store service, see How to Restart the Microsoft Exchange Information Store Service

Note:

In the <Organization Name> Properties dialog box, the Change

Mode button is unavailable if any Exchange Server 5.5 servers are

present or SRS exists in the organization

Uninstalling Exchange Server 2003

After ensuring that your organization meets certain prerequisites, you can run Exchange Setup to uninstall Exchange Server 2003 For detailed steps, see How to Uninstall Exchange Server 2003

How to Upgrade the Exchange 2000 Active Directory Connector

Before you can upgrade a server running Exchange 2000 Active Directory Connector to Exchange Server 2003, you must first upgrade the

Exchange 2000 version of Active Directory Connector to Exchange

Server 2003

Procedure

To upgrade an Exchange 2000 Active Directory Connector

1 On the server running the Exchange 2000 Active Directory

Connector, click Start, click Run, and then type

E:\adc\i386\setup.exe, where E is your CD-ROM drive

2 On the Welcome to the Active Directory Connector Installation Wizard page, click Next

3 On the Previous Installation Detected page, click Reinstall to

upgrade your Exchange 2000 ADC to the Exchange 2003 ADC

The Previous Installation Detected page