Are you searching for Active Directory Scalability information?
If you are looking for Active Directory scalability information for Windows Server 2003 or Windows Server 2008, you should check out the Active Directory Maximum Limits (http://technet.microsoft.com/en-us/library/cc756101.aspx) document. This may answer some of your questions, or at least give you some warnings about the recommended maximum number of domain controllers in a domain, maximum number of users supported by NTDS.DIT (Active Directory database), and recommended maximum number of users in a group. See Active Directory scalability for information on the scale limitations of Active Directory.
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