Here is a Powershell script that will get you the list on your Domain Controller:
Get-ADUser -Filter {Enabled -eq $TRUE} -SearchBase $OU -Properties Name,SamAccountName,LastLogonDate | Where {($_.LastLogonDate -lt (Get-Date).AddDays(-30)) -and ($_.LastLogonDate -ne $NULL)} | Sort | Select Name,SamAccountName,LastLogonDate