Recently I had some problems with my 2009 Macbook and ended up getting it completely erased and reinstalled the operating system at the Apple Store. I have everything else back to normal, but I can't figure out how to install Microsoft Office (word, powerpoint, excel) without haveing to buy it again. I do not have the Product Key nor the original disk from which the initial installation was done a few years ago (I was formerly using Office 2008). The only information I have is the name holding the license and the product ID number which I found on another computer with the same license and program. Please Help!