I just discovered one of our MS OfficeXP SBE Discs has gone "missing" It's an OEM ver that came with a Dell computer. I only noticed it because I needed to use it for Office Update. Luckily, I have 4 more, but I wanted to know if there is a way to reverse engineer the key from the product ID. should I have to re-install this machine, I'll need a key. I know, I should have recorded all the keys into a file. I kept all the software bundled together in separate manilla folder for each computer and kept them on my bookshelf.