First only for US, now all over the world. Here you may grab 100 GB extra storage for your OneDrive for 2 years.
|You may click on “more storage” and see your current storage for your selected Account
Then you click here
|Now you should read the next dialog in your language and answer with “yes”.
But you should read it !!
|and if you refresh the storage page you see:
100 GB extra storage for 2 years
You have more then one OneDrive Account? Then you must switch your Account (Log off and sign in with you another Account)