A report released by analyst house Forrester says that cloud computing does not represent the future of IT.

While many IT applications will be transferable to cloud based architecture, other will not. The future of IT will be represented by a mixed environment of cloud and physical on-site systems.

James Staten, an analyst at Forrester, said: "Not everything will move to the cloud as there are many business processes, data sets and workflows that require specific hardware or proprietary solutions that can’t take advantage of cloud economics. For this reason we’ll likely still have mainframes 20 years from now."