Cleaning Server Manager

Hi,
I don't know a tool for this issue. I think that you must built your own strategy.
-consult DHCP database (if exist a DHCP server) and check the "Lease time". If for example this is 30 days, I can say that the computers registered in DHCP are your current computers!?
-consult WINS database (if exit a WINS server).
-make a script as logon script which will write the ComputerName as an event in Application log on your computer (use "logevent.exe" from resource kit).
-send a message: "power on all computers".
Maybe others have more ideeas.

Quite easy actually. But it couldn't be done in just one single step, or at least it would need your full attention.

If you look in Server Manager, then there are computers that are dim-lighted and there are several that are bright lighted. Dim-lighted means that the computer is not available (turned-off or no more available).

From this could you already filter out which one you should delete. Prior to deleting, make sure that ALL computers in which part you intent to delete are TURNED-ON, therefore making all existing computers bright-lighted.

Deleting would further affect only the registration of computers into domain. If one user would complain that his computer couldn't log-on, then you can add the computer back on.

vh_s

We have used the method found here: http://support.microsoft.com/search/preview.aspx?scid=kb;en-us;Q197478
This returns the age of the accounts and how long it has been since they were used. If an account has not been used in a year, you can be pretty sure it is no longer valid. Amazing how many junk accounts can accumulate over time if you are not diligent about the housekeeping, and who has time for that?