Inactive Users for Active Directory (System Utilities /System Maintenance) [Release Date 29.08.2005]
Identify, move and disable inactive users in your Active Directory Domain. All domain controllers are scanned for the lastLogon data, so you you can be sure the days of inactivity are accurate. Users that have never logged on are also indentified.

Inactive Computers for Active Directory (System Utilities /System Maintenance) [Release Date 29.08.2005]
Scan Active Directory for inactive computer accounts, then move, disable or delete them.