First only for US, now all over the world. Here you may grab 100 GB extra storage for your OneDrive for 2 years.
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You may click on “more storage” and see your current storage for your selected Account
Then you click here |
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Now you should read the next dialog in your language and answer with “yes”.
But you should read it !! |
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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)
Hans Brender's Blog 
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