When MobileMe closed its doors and we moved to iCloud, Apple rewarded paying customers 20GB of free storage for a limited time. That limited time is soon up as of September 30, and Apple is again sending out notes reminding on this fact, according to 9to5Mac:
As a thank you for being a former MobileMe member, you received a complimentary 20GB storage upgrade when you moved to iCloud. Your storage upgrade expires on September 30, 2013.
Further still, Apple reminds that should you be over the 5GB of free storage iCloud offers when the deal expires, iCloud Backup, Documents in the Cloud and iCloud Mail will stop working until you're under 5GB or purchase a sufficiently large paid iCloud storage plan.
So, if you're affected, you've got a week to get sorted. On top of your free 5GB, 10GB costs $20 per year, 20GB is $40 per year and the top tier of 50GB is $100 per year. For more information, head over to the Apple Support link below.