sygnus21 said:
What many will find out is though the activation of a questionable key may work the first time. The second or third time reality hits that the key was a fraud when it no longer activates.

There are plenty of posts online about how an Office product key worked and now suddenly doesn't. The prevailing issue is that the keys came from questionable sources.

I say again, get your software from legitimate sources... your PC security and personal information may depend on it.

My two cents.
I have several cheap Office keys which still work after several years. If one stops working I'll just buy another cheap key,