This script outputs a list of all VMs without VMware Tools or with VMware Tools that needs to be updated.

Get-OutdatedVMTools.ps1

#requires -Version 1
#requires -PSSnapin VMware.VimAutomation.Core

function Get-OutdatedVMTools {

    <#
            .SYNOPSIS
            No parameters needed. Just execute the script.

            .DESCRIPTION
            This script outputs a list of all VMs without VMware Tools or with VMware Tools that needs to be updated.
     
            .EXAMPLE
            Get-OutdatedVMTools

            Get a list of all VMs with outdated VMware Tools.
    
            .NOTES
            Author: Patrick Terlisten, patrick@blazilla.de, Twitter @PTerlisten
    
            This script is provided "AS IS" with no warranty expressed or implied. Run at your own risk.

            This work is licensed under a Creative Commons Attribution NonCommercial ShareAlike 4.0
            International License (https://creativecommons.org/licenses/by-nc-sa/4.0/).
    
            .LINK
            http://www.vcloudnine.de
    #>

    # Create empty hash table
    $OutputTable = @()

    # Get a list of all VMs
    $AllVMs = Get-VM

    try
   
    {
        # Loop to process each VM and fill the $OutputTable hash table
        ForEach ($VM in ($AllVMs | Get-View)) {
            $Output = ''| Select-Object -Property VM
    
            If (($VM.Guest.get_ToolsVersionStatus() -eq 'guestToolsNeedUpgrade') -or `
            ($VM.Guest.get_ToolsVersionStatus() -eq 'guestToolsNotInstalled')) {
                $Output.VM = $VM.Name
    
                $OutputTable += $Output
            }
        }
    }
   
    catch
   
    {
        "Error was $_"
        $line = $_.InvocationInfo.ScriptLineNumber
        "Error was in Line $line"
    }

    finally
   
    {
        # Output the filled hash table
        If ($OutputTable.Length -eq 0) {Write-Host -Object 'No VMs with outdated Tools found!'}

        else {$OutputTable}'I can do cleanup things here'
    }
}