Did you know that there are certain pre-defined limits of Active Directory? For example, there is a maximum on the number of objects (users, groups, computers, organizational units, group policies, etc.) that can exist in Active Directory; specifically
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Read the complete post at http://blogs.technet.com/activedirectoryua/archive/2008/11/17/check-out-the-maximum-limits-of-active-directory.aspx