Function Set-UpdateToolsPolicy {
	<#
		.SYNOPSIS
			A function to change the update policy one or more VM's 
		.DESCRIPTION
			This script will change the VMware Tools Update policy 
			on one or many virtual machines
		.PARAMETER  VM
			The name of one or more virtual machines, this can be 
			passed from the pipeline
		.PARAMETER  Policy
			The policy setting - has to be be either manual (do not try 
			and upgrade tools on each boot cycle) or upgradeAtPowerCycle 
			(tools will be checked for upgrade at each power cycle)
		.EXAMPLE
			PS C:\> Get-VM foo | Set-UpdateToolsPolicy -Policy manual
		.EXAMPLE
			PS C:\> Set-UpdateToolsPolicy -VM foo -Policy upgradeAtPowerCycle
		.NOTES
			Author: Maish Saidel-Keesing
		.LINK
			http://technodrone.blogspot.com/2012/03/set-updatetoolspolicyfor-your-vms.html

	#>
	[CmdletBinding()]
	Param(
	[Parameter(Position=0,Mandatory=$True,ValueFromPipeline=$True)]
	[String]
	$VM,

	[ValidateSet("manual","upgradeAtPowerCycle")]
	[String]
	$Policy
	)
    
	begin {
	$config = New-Object VMware.Vim.VirtualMachineConfigSpec
	$config.Tools = New-Object VMware.Vim.ToolsConfigInfo
	$config.Tools.ToolsUpgradePolicy = $Policy
	}	
    Process
    {
        foreach ($vmobject in (Get-VM $VM)) {
			$vmobject.ExtensionData.ReconfigVM($config)
		}
    } 
}