How can I find all computer accounts in my Active Directory domain that have been inactive for x days using PowerShell?
This would give you all computer accounts that have no activity for the last 365 Days.
Search-ADAccount -AccountInactive -ComputersOnly -TimeSpan 365.00:00:00
This would sort it for you by lastlogondate.
Search-ADAccount -AccountInactive -ComputersOnly -TimeSpan 365.00:00:00 | Sort-Object lastlogondate | Ft name,lastlogondate -auto
This would give you disabled computer accounts.
Search-ADAccount -AccountDisabled -ComputersOnly