DFS Namespaces or DFSN management command line tools are available on Windows Server 2008 and also on Windows Vista SP1 as part of the Microsoft Remote Server Administration Tools (RSAT). The three available tools are Dfsutil.exe, Dfscmd.exe and Dfsdiag
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Read the complete post at http://blogs.technet.com/filecab/archive/2008/06/26/dfs-management-command-line-tools-dfsutil-overview.aspx