So, as a paid user of MobileMe, Apple provided you with 20 GB of iCloud storage. Suddenly, in October ’13, Apple removed 15 GB of that, and you’re getting messages from Apple that your iCloud storage is getting full, or even the dreaded message, “Your iCloud storage is full… You can no longer send or receive messages with your iCloud email address…” Apple is strongly encouraging you to buy more storage. Do you have any other options?

As Apple suggests, go to System Preferences > iCloud > Manage > Mail. At that point, Apple recommends, “To free up storage used by Mail, erase messages in the Junk and Trash folders.”

That’s a good start, but that’s not nearly enough. If that shows that Mail really is the culprit in hogging your iCloud storage, try deleting the attachments from your received and sent mail! That can reduce your iCloud storage tremendously. (That alone cut mine down from about 4.8 GB to 1.2 GB).

To find your mail with attachments, in Apple Mail, you ca …

Source: Mac OSX Hints