Been doing a lot of research and getting ready to upgrade to SSD. However, I couldn't find an exact answer to my situation. I do not have the ML OS discs nor did I purchase it off of the Apple store. I do have ML currently installed on the iMac HDD because I purchased it that way. Also, I have Microsoft Office, etc. Do I need to purchase ML for my new SSD to boot from and install? How do I keep my Microsoft Office as well?