Even though cloud services delivered by major IT service providers hold potential promise for long-term value, they are currently awash in a frenzy of irrational exuberance. Forrester's data shows that a growing number of enterprise clients are implementing or seriously investigating cloud IT services delivered by major IT service providers. But cloud services still have to clear technical and business hurdles to be enterprise-ready for many firms. Decision-makers who monitor how these key issues play out over the next months will be in a stronger position to leverage value from cloud services near-term and in the future. Forrester surveyed 11 major global IT service providers to provide sourcing decision-makers with the provider perspective on barriers to cloud services adoption in the enterprise.