Last time I bought a "grey market" product key like this one, I paid around 25-30 USD. After upgrading MB & CPU, I had to get a new one (since these are ODM keys, meaning one-time use). I found this one, and the price was so ridiculous that I thought it wouldn't matter if it did not work. I'm really pleased to say that it worked perfectly! LOL! 3 EURO WTH!

I did not expect it for the 4 euro's to work but it did perfectly! It upgraded by windows 10 home version to pro and it didn't require any weird tools. Highly recommend.

Fue pagar y automáticamente me llegó al correo, cero problemas a la hora de activar el código muy recomendable

it worked perfectly, Thank you!

I was not expecting the code to work for this amazing price but i took a chance and bought a key. To my surprise it worked and the code was available instantly and my windows was activated successfully! Will definitely recommend this to anyone!