On its mobile iOS operating system, Apple has created a "closed garden" environment in which everything from apps to accessories has to be approved by Apple, as opposed to Google's more wide-open Android system.

CNN: Doug Gross,

Program Streamlines Content Development Environment and Expands the World of PlayStation to Open Operating System Based Portable Devices.

ENGADGET: PlayStation Suite's 'open beta' SDK available to download now

True, there have been some complaints from those who see the new operating system as an uneasy mix of the new mobile world and the old desktop environment, but Microsoft seems confident that all is going to plan.

BBC: Windows boss shown the door