Organisations underestimate the cost of cloud computing:-

Moving IT to the public cloud could cost IT departments more than running services in-house, research from analyst firm Ovum has revealed.
Despite claims from suppliers that cloud computing will inevitably cut costs, businesses could find themselves having to pay more, said senior analyst Laurent Lachal.
"Every time you talk to a service provider, they tell you buy my stuff because it will lower your cost and boost your profit. It might be the case but you better do your calculations first," he said.
In reality, IT departments will need to invest heavily to integrate cloud services into their own IT structures, if they are to benefit from the flexibility the cloud offers.