Windows - Retrieve Server Operating Systems that are active in Active Directory

IT Managers and system administrators should be aware of exactly what Server Operating Systems are in use across their environment, if you are unsure you can quickly understand/audit what OS's are running within your Active Directory estate by running the following Powershell commands;

On a domain controller, search for and run "Active Directory Module for Windows Powershell"

If you do not have it installed, you can add it using the following command;

Add-WindowsFeature RSAT-AD-PowerShell

To get the filtered list showing the Server Name, Operating System and Operating System Version run the following command;

Get-ADComputer -Filter 'operatingsystem -like "*Windows server*" -and enabled -eq "true"' -Properties  Name, Operatingsystem, OperatingSystemVersion | Sort-Object -Property Operatingsystem | Select-Object -Property Name, Operatingsystem, OperatingSystemVersion | ft -Wrap -Auto

If you then want to output this to a CSV file use the following command;

Get-ADComputer -Filter 'operatingsystem -like "*Windows server*" -and enabled -eq "true"' -Properties  Name, Operatingsystem, OperatingSystemVersion | Sort-Object -Property Operatingsystem | Select-Object -Property Name, Operatingsystem, OperatingSystemVersion | ft -Wrap -Auto >> C:\Temp\ServerList.csv

If this list returns Server 2008 R2 or older, these need to be addressed as soon as possibly as they are End of Life products and are a risk to your environment.