Are our Windows 2003 servers actually used?

We have several thousand Windows 2003 servers. Experience tells me many will no longer be used. What tool will help us to identify if a server is actually used?
SQL,IIS and core infrastructure such as AD,DNS,WINS,File Servers are probably easy but still leaves us with loads of servers not running any of these types of services.
The usual answer seems to be "switch the server off for a couple of weeks" but hat's not really an acceptable solution ...
Thanks.

We have several thousand Windows 2003 servers. Experience tells me many will no longer be used. What tool will help us to identify if a server is actually used?
SQL,IIS and core infrastructure such as AD,DNS,WINS,File Servers are probably easy but still leaves us with loads of servers not running any of these types of services.
The usual answer seems to be "switch the server off for a couple of weeks" but hat's not really an acceptable solution ...
Thanks.
There is a few things you can do, yes one is AD where you can use LDFDE,ADUC and Powershell to export objects for reference.
There is other options as well:
Check what roles the server has installed and view the usage of those services.
View the open ports which will give an idea of the roles it has.
You can use a network analyzer like WireShark or AIrmon-ng to view what types of traffic are coming from the servers, easier if you have servers on their own subnets like SANs etc.
Use Syslogging software like Splunk, requires installing agents on the servers.
View the SRV records on the DNS servers.
The first two are ideal, although it would be useful to map-out your network for future reference.
Also don’t just switch off the server to see if it’s in-use or not, that’s rogue and bad advice.

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