Cloud computing allows companies to move from expensive in-house IT infrastructure and staff to using cloud services provided over the Internet by large companies. It is forecast that by 2014, a third of organizations will provide cloud services to customers or partners. Mobile-optimized cloud services will also become important as half of IT executives believe they will be the primary customer interface by 2014. Cloud services can be delivered in public, private, or hybrid models and through software, platform, or infrastructure-as-a-service.