AD Usernamen in CSV Vergleichen

Import-Module ActiveDirectory

$users = Get-ADUser -filter *

$userCSV = "U:\export3.csv"  
Import-Csv $userCSV -delimiter ';' | Foreach-Object{  
        $csvuser= $_
        if($users | Where-Object {$_.SamAccountName -eq $csvuser.SAMAccountName}) {
            New-Object psobject -Property @{
                SamAccountName = $csvuser.SAMAccountName
                Status = 'im AD vorhanden'   
            }|export-csv U:\export_final.csv -NoType -Delimiter ';' -Encoding UTF8  
        } 
        else {
            New-Object psobject -Property @{
                Name = $csvuser.SAMAccountName
                Status = 'nichtmehr im AD, nur in der Liste'   
                
            }|export-csv U:\export_final.csv -NoType -Delimiter ';' -Encoding UTF8  
           
        } 
}

Import-Module ActiveDirectory


$Ausgabepfad = "U:\export_final.csv"  
$users = Get-ADUser -filter *

$userCSV = "U:\export3.csv"  
Import-Csv $userCSV -delimiter ';' | Foreach-Object{  
        $csvuser= $_
        
        if($users | Where-Object {$_.SamAccountName -eq $csvuser.SAMAccountName}) {
            New-Object psobject -Property @{
                SamAccountName = $csvuser.SAMAccountName
                Status = 'im AD vorhanden'   
            }
        } 
        else {
            New-Object psobject -Property @{
                Name = $csvuser.SAMAccountName
                Status = 'nichtmehr im AD, nur in der Liste'   
                
            }
            $arr=@(Get-Process) -is [array]
            $arr += $csvuser
            $arr += "Status"  
            echo $arr            |export-csv $Ausgabepfad  -NoType -Delimiter ';' -Encoding UTF8   
           
        } 
}

Import-Module ActiveDirectory
$OU_ADUSER="OU=Benutzer,OU=X,OU=X,DC=X,DC=de"  
$userCSV="U:\export3.csv"  
(Import-Csv $userCSV -delimiter ';'-Encoding ) | ?{!(Get-aduser $_.SAMAccountName -SearchBase $OU_ADUSER -EA SilentlyContinue)} | export-csv -path "U:\user.csv" -Delimiter ";" -NoType -Encoding UTF8  

$inFile = "U:\export3.csv"  
$outFile = "U:\export_final.csv"  

$aUsers = Import-Csv $inFile

foreach($aUser in $aUsers){
    #$aUser.SAMAccountName
    #$aUser | Out-File $outFile -Append
    $oADUser = Get-ADUser $aUser.SAMAccountName -ErrorAction SilentlyContinue
    if(-not ($oADUser)){
        $aUser.SAMAccountName | Out-File $outFile -Append
        $aUser.SAMAccountName + " does not exists!"  
    }else{
        $aUser.SAMAccountName + " does exists!"  
    }
    $oADUser = $null
}