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+---
+slug: "powershell-active-directory-computers-filtering"
+title: "PowerShell: Filter Active Directory Computers"
+date: 2024-08-07
+comments: true
+tags: [powershell, active directory]
+---
+I recently worked on a client project, where I had to do some work around Active Directory Computers. I used PowerShell and some light filtering and processing. And now I share those examples, and hopefully someone finds them interesting or helpful. Maybe it will be me, who finds it interesting in the future. In that case: Moin Andi! 👋
+
+## Example 1: Filter Computer by Operating System Version
+
+The AD attribute `OperatingSystemVersion` holds the OS version with the build number in a format like this: `10.0 (19041)`
+
+I needed to find some older devices, but it's not possible to compare with a "less than" operator against the attribute value. So I only extracted the actual build number in the parenthesis using the `-match` operator and a Regular Expression. If the RegEx matches, the extracted result is extracted into the automatic variable `$Matches`.
+
+```powershell
+$ADComputers = Get-ADComputer -Filter * -Properties OperatingSystemVersion
+
+foreach($ADComputer in $ADComputers) {
+    if($ADComputer.OperatingSystemVersion -match "\d+\.\d? \((\d+)\)") {
+        if($Matches[1] -lt 19042) {
+            Add-ADGroupMember -Identity "My-Group-with-old-devices" -Members $ADComputer.DistinguishedName
+            $ADComputer.Name # just outputting this, so I know where I'm currently at
+        }
+    }
+}
+```
+
+## Example 2: Retrieve only Windows Client Computers
+
+Since the client also had Windows Servers and other non-Windows devices joined to AD, I used the following code to retrieve only Windows **Clients**:
+
+```powershell
+$ADComputers = Get-ADComputer -Filter "OperatingSystem -notlike '*Server*' -and OperatingSystem -like '*Windows*'" -Properties OperatingSystemVersion,OperatingSystem
+```
+
+## Example 3: List all Computers which are not managed by Intune
+
+I also wanted to compare which devices from AD are not managed via Microsoft Intune. I exported a list of Windows devices from Intune, using the Intune Admin Center. 
+
+[![Export Windows Devices list via Intune in CSV format](/images/2024/2024-08-07-Intune-Export-Devices.jpg "Export Windows Devices list via Intune in CSV format")](/images/2024/2024-08-07-Intune-Export-Devices.jpg)
+
+Then I imported that list (CSV format) into PowerShell and compared it against a list of AD computers using the `-notin` operator. All devices that are returned then, are **not** in Intune, but only in Active Directory.
+
+```powershell
+$IntuneDevices = Import-Csv IntuneExportDownloadedFromThePortal.csv
+$NonIntuneDevices = foreach($ADComputer in $ADComputers) {
+    if($ADComputer.Name -notin $IntuneDevices."Device name") {
+        $ADComputer | Select-Object -Property Name,Enabled,OperatingSystem,OperatingSystemVersion
+    }
+}
+$NonIntuneDevices | Export-Csv -Path .\NonIntuneDevices.csv -NoTypeInformation -Encoding utf8
+```
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