… provided you also installed Microsoft's Active Directory Client Extensions (DSClient.exe) for Windows NT4.

For more information about Microsoft's Active Directory ClientExtensions, please refer to Microsoft's website.

Active Directory Client Extensions for Windows 95/98 and Windows NT4.0

http://www.microsoft.com/windows2000/server/evaluation/news/bulletins/adextension.asp

Exchange:

Exchange 2000 support is provided in version 4 and above within DNTU's …