You might think it appears in the Help | About dialog box – but no.

The Product Key, as needed in the installation process, is not displayed by MS Office software. If you lose it, you’ll have to pay for another copy of Microsoft Office. However you got it, the Product Key is valuable. Usually it’s on the retail packaging or was notified to you as part of the online ordering process. The Microsoft Office Product Key is essential to install the software on any computer. Lost your Product Key? Here’s how to find it. Even if you think Office has disappeared from the computer, it’s worth a try.

If your computer is still running, you can retrieve the original Product Key from the settings. It’s worth keeping a copy with your other important records. Lose it and you have to buy another copy. We keep saying it – the MS Office Product Key is very valuable. Ideally, you’ve made a copy of the Product Key somewhere else but probably not. The install disk is replaceable the Product Key is unique and irreplaceable. Most people think that the install disk is the important part but it’s not – the Product Key is the most essential thing to find. Usually, the two are stored together (the Product Key is often on a sticker placed on the CD case). There are two things you need to recover – the installation files and the product key. Let’s say you’ve lost your Microsoft Office installation CD / DVD or even floppy disks from years ago – what can you do? What to do if you’ve lost your Microsoft Office install disks?

Office for mac 2007 missing installer