tests/Test-CmClientOldVersion.ps1

function Test-CmClientOldVersion {
    [CmdletBinding()]
    [OutputType()]
    param (
        [parameter()][string] $TestName = "Old Client Versions",
        [parameter()][string] $TestGroup = "operation",
        [parameter()][string] $TestCategory = "CM",
        [parameter()][string] $Description = "Check for clients with version older than site version",
        [parameter()][hashtable] $ScriptParams
    )
    try {
        $startTime = (Get-Date)
        [System.Collections.Generic.List[PSObject]]$tempdata = @() # for detailed test output to return if needed
        $stat   = "PASS" # do not change this
        $except = "WARNING"
        $msg    = "No issues found" # do not change this either
        $query = "SELECT DISTINCT fcm.Name,
sys.Client_Version0 as ClientVersion,
fcm.Domain,
sys.User_Name0 as UserName,
fcm.SiteCode,
st.Version as SiteVersion
FROM v_FullCollectionMembership_Valid fcm
INNER JOIN v_R_System_Valid sys ON fcm.ResourceID = sys.ResourceID
INNER JOIN v_Site st ON st.SiteCode = fcm.SiteCode
WHERE fcm.CollectionID = 'SMS00001' AND sys.Client_Version0 < st.Version"

        $res = Get-CmSqlQueryResult -Query $query -Params $ScriptParams
        $siteversion = $res.SiteVersion
        if ($res.Count -gt 0) {
            $stat = $except
            $msg  = "$($res.Count) devices have a client installed older than site version: $($siteversion)"
            Write-Log -Message $msg
            $res | Foreach-Object {
                $tempdata.Add(
                    [pscustomobject]@{
                        ComputerName = $($_.Name)
                        SiteCode     = $($_.SiteCode)
                        Version      = $($_.ClientVersion)
                        SiteVersion  = $($_.SiteVersion)
                        UserName     = $($_.UserName)
                    }
                )
            }
        }
    }
    catch {
        $stat = 'ERROR'
        $msg = $_.Exception.Message -join ';'
    }
    finally {
        Set-CmhOutputData
    }
}