Microsoft is making changes to your free storage on their OneDrive cloud service. They’re reducing it from 15GB to 5GB. If you’re a user of the service and this move will inconvenience you, you can fight for your 15GB as well as the additional 15GB if you opt-in to the Camera Roll Bonus. All you have to do is claim your storage from this link. The condition is you have to claim it before the end of January 2016. So, better click that link now.
Source: Droid Life