Can I Use the MS Office 2013 Product Key Free for Activation?

I found a website that offers an MS Office 2013 product key for free, but I’m a little skeptical about its legitimacy. I want to activate my Microsoft Office 2013 without purchasing a key, but I’m unsure if this free key will work. Has anyone tried this free key and had success with activation?

Here’s the link to the guide: MS Office 2013 Product Key Free. Does it work for activation, or should I be cautious about using it?