AD-GPO-Get-ADGPOReplication.ps1

function Get-ADGPOReplication
{
	<#
	.SYNOPSIS
		This function retrieve one or all the GPO and report their DSVersions and SysVolVersions (Users and Computers)
	.DESCRIPTION
		This function retrieve one or all the GPO and report their DSVersions and SysVolVersions (Users and Computers)
	.PARAMETER GPOName
		Specify the name of the GPO
	.PARAMETER All
		Specify that you want to retrieve all the GPO (slow if you have a lot of Domain Controllers)
	.EXAMPLE
		Get-ADGPOReplication -GPOName "Default Domain Policy"
	.EXAMPLE
		Get-ADGPOReplication -All
	.NOTES
		Francois-Xavier Cat
		@lazywinadm
		lazywinadmin.com
	
		VERSION HISTORY
		1.0 2014.09.22 	Initial version
						Adding some more Error Handling
						Fix some typo
	#>
	#requires -version 3
	[CmdletBinding()]
	PARAM (
		[parameter(Mandatory = $True, ParameterSetName = "One")]
		[String[]]$GPOName,
		[parameter(Mandatory = $True, ParameterSetName = "All")]
		[Switch]$All
	)
	BEGIN
	{
		TRY
		{
			if (-not (Get-Module -Name ActiveDirectory)) { Import-Module -Name ActiveDirectory -ErrorAction Stop -ErrorVariable ErrorBeginIpmoAD }
			if (-not (Get-Module -Name GroupPolicy)) { Import-Module -Name GroupPolicy -ErrorAction Stop -ErrorVariable ErrorBeginIpmoGP }
		}
		CATCH
		{
			Write-Warning -Message "[BEGIN] Something wrong happened"
			IF ($ErrorBeginIpmoAD) { Write-Warning -Message "[BEGIN] Error while Importing the module Active Directory" }
			IF ($ErrorBeginIpmoGP) { Write-Warning -Message "[BEGIN] Error while Importing the module Group Policy" }
			Write-Warning -Message "[BEGIN] $($Error[0].exception.message)"
		}
	}
	PROCESS
	{
		FOREACH ($DomainController in ((Get-ADDomainController -ErrorAction Stop -ErrorVariable ErrorProcessGetDC -filter *).hostname))
		{
			TRY
			{
				IF ($psBoundParameters['GPOName'])
				{
					Foreach ($GPOItem in $GPOName)
					{
						$GPO = Get-GPO -Name $GPOItem -Server $DomainController -ErrorAction Stop -ErrorVariable ErrorProcessGetGPO
						
						[pscustomobject][ordered] @{
							GroupPolicyName = $GPOItem
							DomainController = $DomainController
							UserVersion = $GPO.User.DSVersion
							UserSysVolVersion = $GPO.User.SysvolVersion
							ComputerVersion = $GPO.Computer.DSVersion
							ComputerSysVolVersion = $GPO.Computer.SysvolVersion
						}#PSObject
					}#Foreach ($GPOItem in $GPOName)
				}#IF ($psBoundParameters['GPOName'])
				IF ($psBoundParameters['All'])
				{
					$GPOList = Get-GPO -All -Server $DomainController -ErrorAction Stop -ErrorVariable ErrorProcessGetGPOAll
					
					foreach ($GPO in $GPOList)
					{
						[pscustomobject][ordered] @{
							GroupPolicyName = $GPO.DisplayName
							DomainController = $DomainController
							UserVersion = $GPO.User.DSVersion
							UserSysVolVersion = $GPO.User.SysvolVersion
							ComputerVersion = $GPO.Computer.DSVersion
							ComputerSysVolVersion = $GPO.Computer.SysvolVersion
						}#PSObject
					}
				}#IF ($psBoundParameters['All'])
			}#TRY
			CATCH
			{
				Write-Warning -Message "[PROCESS] Something wrong happened"
				IF ($ErrorProcessGetDC) { Write-Warning -Message "[PROCESS] Error while running retrieving Domain Controllers with Get-ADDomainController" }
				IF ($ErrorProcessGetGPO) { Write-Warning -Message "[PROCESS] Error while running Get-GPO" }
				IF ($ErrorProcessGetGPOAll) { Write-Warning -Message "[PROCESS] Error while running Get-GPO -All" }
				Write-Warning -Message "[PROCESS] $($Error[0].exception.message)"
			}
		}#FOREACH
	}#PROCESS
}