Coexisting with Previous Versions

Coexisting with Previous Versions

When your Microsoft Exchange 2000 Server organization includes connections to previous versions of Exchange and Microsoft Windows NT, you need to consider a variety of factors. You need to be familiar with how to administer your Exchange organization in mixed mode. In addition, you need to consider the management of Connection Agreements with servers that are not running Exchange 2000 using Active Directory Connector (ADC).

Another factor you will need to consider is the clean up of duplicate accounts in Active Directory, which can occur as a result of multiple directories being migrated or upgraded into Active Directory. These scenarios can include upgrading to Windows 2000, upgrading to Exchange 2000, using third-party mail connectors, and migrating from third-party e-mail systems.

This section contains the following topics:

Answers to Frequently Asked Questions

What is the difference between operating my Exchange organization in mixed mode versus native mode?

You can operate your Exchange 2000 organization in mixed mode or native mode. Native mode offers full Exchange 2000 functionality, while mixed mode offers interoperability between Exchange 2000 and previous versions of Exchange. When you install Exchange 2000 your Exchange 2000 organization is in mixed mode by default.

This default setting ensures future interoperability with previous versions of Exchange (for example, if you install a server running Exchange 5.5 at a later time), even if no Exchange 5.x servers exist at the time of installation. The concept of mixed mode and native mode in Exchange organizations is similar to the idea of mixed mode and native mode domains in Active Directory. For Exchange 2000, native mode and mixed mode can be selected only at an organizational level. More...

Do I manage my Exchange 4.x and 5.x mailboxes from Exchange Server Administrator or from Windows 2000 Active Directory Users and Computers?

You can manage users with mailboxes on Exchange 4.x and 5.x servers from Exchange Server Administrator or from Windows 2000 Active Directory Users and Computers. There are advantages to using Active Directory Users and Computers. More...

Do I manage my Exchange 4.x and 5.x servers from Exchange Server Administrator or from System Manager?

Although the configuration of an Exchange 5.5 organization is synchronized with Active Directory using a Configuration Connection Agreement, you must administer all 4.x and 5.x servers using Exchange Server Administrator.  More...

After installing Active Directory Connector to an existing Microsoft Exchange version 5.5 server and upgrading the Windows NT accounts domain to Windows 2000, it appears that there are multiple objects representing the same users, contacts, and groups in Active Directory. What is the reason for this?

Multiple objects can be created when multiple directories are migrated or upgraded into Active Directory. Active Directory Account Cleanup Wizard is a utility designed to merge duplicate objects into one account.

When duplicate accounts are merged into a selected destination account, Windows NT access and group and Distribution List memberships are preserved. In addition, the integrity of all other available attributes is maintained. More...

What deployment scenarios create duplicate accounts in Active Directory?

The following are three of the deployment scenarios that warrant the use of Active Directory Account Cleanup Wizard.