A PowerShell script to help manage user and machine accounts.

Get inactive / old computer in your domain as a simple CSV.

# Gets time stamps for all computers in the domain that have NOT logged in since after specified date

import-module activedirectory

$domain = “domain.mydom.com”

$DaysInactive = 90

$time = (Get-Date).Adddays(-($DaysInactive))

# Get all AD computers with lastLogonTimestamp less than our time

Get-ADComputer -Filter {LastLogonTimeStamp -lt $time} -Properties LastLogonTimeStamp |

# Output hostname and lastLogonTimestamp into CSV

select-object Name,@{Name=”Stamp”;

Expression={[DateTime]::FromFileTime($_.lastLogonTimestamp)}} | export-csv OLD_Computer.csv -notypeinformation

Source:

https://gallery.technet.microsoft.com/Get-Inactive-Computer-in-54feafde