param(
    [Parameter(Mandatory = $true)][string]$InputDocx,
    [Parameter(Mandatory = $true)][string]$OutputPdf
)

$ErrorActionPreference = 'Stop'
$word = $null
$doc = $null
try {
    $inputPath = (Resolve-Path -LiteralPath $InputDocx).Path
    $outputPath = [System.IO.Path]::GetFullPath($OutputPdf)
    $outputDir = [System.IO.Path]::GetDirectoryName($outputPath)
    [System.IO.Directory]::CreateDirectory($outputDir) | Out-Null

    $word = New-Object -ComObject Word.Application
    $word.Visible = $false
    $word.DisplayAlerts = 0
    $doc = $word.Documents.Open($inputPath, $false, $false)

    foreach ($toc in $doc.TablesOfContents) {
        $toc.Update() | Out-Null
    }
    $doc.Fields.Update() | Out-Null
    $doc.Save()
    $doc.ExportAsFixedFormat($outputPath, 17)
}
finally {
    if ($null -ne $doc) {
        $doc.Close(0)
        [void][System.Runtime.InteropServices.Marshal]::ReleaseComObject($doc)
    }
    if ($null -ne $word) {
        $word.Quit()
        [void][System.Runtime.InteropServices.Marshal]::ReleaseComObject($word)
    }
    [GC]::Collect()
    [GC]::WaitForPendingFinalizers()
}