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The Active Directory Connector (ADC) Service Pack 1 (SP1) has its own Setup program in the ADC\i386 folder of the service pack. The installation of Microsoft Exchange 2000 Server SP1 or later does not automatically update the ADC. When you run the ADC Setup program, the ADC is actually reinstalled from the original released version to the SP1 version. In some cases, not all the files are updated correctly, and you are prompted by the ADC Setup program to abort, retry, or ignore. If you select Retry, the Setup program does not succeed, and if you select Ignore, the files are not updated correctly.
The four files that are not updated are Exchmem.dll, Address.dll, Escprint.dll, and Maildsmx.dll.
This behavior may occur if the Active Directory Users and Computers snap-in is running when you run the Setup program, because the Active Directory Users and Computers snap-in uses the files that are listed in the "Symptoms" section of this article.
To resolve this behavior, close all Exchange-related Microsoft Management Console (MMC) snap-ins before you run any type of Exchange setup or update program.