Apple gave former MobileMe members a complimentary twenty gigabytes of free cloud storage upgrade after moving to iCloud between October 12, 2011 and August 1, 2012. The company's been sending email notices ahead of the cut-off deadline a few times now.
Unfortunately, today marks the day when your complimentary storage expires. Yours truly used to be a paid MobileMe member and today my iCloud storage got automatically adjusted to the free entry-level 5GB iCloud tier. Here's what you need to know about the change and how to avoid service interruption...