Converting .msg to .pdf using powershell

I am using powershell to convert .msg to .pdf. Below is the code i am using

 $docFullName = $msgFullName -replace '\.msg$', '.doc'
 $pdfFullName = $msgFullName -replace '\.msg$', '.pdf'

 $msg = $outlook.CreateItemFromTemplate($msgFullName)
 $msg.SaveAs($docFullName, 4)

 $doc = $word.Documents.Open($docFullName)
 $doc.SaveAs([ref] $pdfFullName, [ref] 17)

 $doc.Close()

But when the pdf is getting generated, it is coming with with red text including underline text. Can you please suggest what i am missing.