Hi,

I've been using Microsoft Office on my Macbook even since i bought it last year in 2014. I used Word, Powerpoint and Excel but have never used Outlook before. Now when i open Outlook, it says to enter my product key. I don't know where i placed my product key. And when i tried to login using my Microsoft account, it says my account is invalid. 

Regards,

Dinn Sahar