Unlike previous versions, Exchange 2000 Server does not include
its own directory service. Exchange 2000 Server is now integrated
with the directory in Windows 2000, called Active
Directory. Active Directory provides functionality such
as the global address list, address book views, and offline address
books.
During directory synchronization, when connectors import user
information from other messaging systems into Exchange, they write
the information to Active Directory. Active Directory stores
information differently than the directory service used by Exchange
5.5. One important difference between the Exchange 5.5 and Exchange
2000 is that with Exchange 5.5, recipients from other messaging
systems are stored in Exchange as custom
recipients. Custom recipients cannot access Windows NT
resources. With Exchange 2000, you can choose to create either
contact or user objects in Active Directory; that is, you can
provide a logon account (and therefore, access to Windows 2000
resources) to recipients who have mailboxes on other messaging
systems.
Cleaning Duplicates in Active Directory
Duplicate accounts may be created by directory synchronization,
migration from another messaging system, or upgrading a Windows NT
domain. To help you manage duplicate user accounts, Exchange
provides
Active Directory Account Cleanup Wizard. The wizard searches a
Windows 2000 forest for possible duplicate Windows 2000 accounts
and allows you to merge duplicate accounts. Active Directory
Account Cleanup Wizard is located in the Support\Adclean\I386
directory on the Exchange compact disc. The file name is
Adclean.exe.