This is a photocopy of the original. You will see the cc: highlighted. That means that "carbon copy" (or just a copy) went to the cc'd person. That is IF that really is a true cc to someone. I could make a photo copy of the original tomorrow and add some written initials and highlight them too. IN either case it still would not be the original written signature of Michael. The original letter would have the signature on it.
The seller explained in item description that it was original with money back guarantee if not pass PSA. He has also put other MJ autograph for sales, which I think it is not real.