function Get-WindowsServiceUser {
<#
.SYNOPSIS
    Returns the username which runs a particular service
#>
    param(
        [string]$ServiceName
    )

    $service = Get-Service -Name $ServiceName -ComputerName . -ErrorAction SilentlyContinue

    if ($null -eq $service) {
        Write-Warning ("Service [{0}] could not be located." -f $ServiceName)
        return $null
    }

    $serviceAccount = (Get-CIMInstance Win32_Service -Filter ("Name = '{0}'" -f $service.Name)).StartName;

    return $serviceAccount
}