Microsoft has announced radical changes to its OneDrive cloud storage service, ending unlimited storage for Office 365 users. Free storage is also being decreased from 15GB to 5GB for all users. The reason for the scaling back of storage comes after Microsoft found that a few customers were using up to 75TB of cloud storage from a single account:
Since we started to roll out unlimited cloud storage to Office 365 consumer subscribers, a small number of users backed up numerous PCs and stored entire movie collections and DVR recordings. In some instances, this exceeded 75 TB per user or 14,000 times the average.