Nerval's Lobster writes "Companies are rushing to lock customer data into their specific walled gardens, Rackspace CTO John Engates argued in an interview after a Cloud Expo keynote in Silicon Valley. That makes it more important than ever to ensure that the cloud undergirding all the various functions of daily life remains open. 'These companies have grown up in the era of enterprise software and they're addicted to enterprise software margins, magnitudes more profitable than what we make as a hosting company,' he said. 'Now you have software companies embracing cloud computing and taking the same enterprise-software playbook they've had for years and trying to run it in the cloud.' Ultimately, he added, cloud computing needs to adopt the Linux model. 'Linux opened it up and gave you vendor choice, with numerous vendors bringing their own strengths to the table.'"