Microsoft are giving away an extra 100GB of free storage (which is your for 2 years) for OneDrive users who are Bing Rewards members in the US. However, if you don’t live in the US, then you can also do this as well by following the steps below:
If you are in the US, then just go here and sign up for the rewards Program.
If you don’t live in the US, then using Chrome as your browser, download the Hola extension for Chrome and enable it.
Click on the Hola icon and select US as your country.
Now follow this link and sign up to the rewards program
Next follow this link and click, Get my storage.
Accept the terms & Conditions
You should now see the message stating that you were successful
Now your OneDrive storage should read 100GB better off.
Note, mine states 228GB as Microsoft did a similar thing last year.