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Vote for NetWrix Active Directory Change Reporter Free Edition
The product keeps tabs on what's going on inside your Active Directory, tracks changes to users, groups, OUs, and all other types of AD objects and fills major gaps found in native Microsoft tools. This is the newly updated freeware edition with enhanced reporting capabilities. E.g. now the modification events indicate "before" and "after" values for all modified settings (e.g. login name changed from one value to another)