Why did Adobe change the name of Flex Builder to Flash Builder?
We changed the name of Flex Builder to reflect the expanded role that it plays in developing mobile, web, and desktop applications for the Flash Platform. While Flex developers will use Flash Builder to build and test Flex applications, ActionScript developers will use Flash Builder to write, edit, and test ActionScript in the creation of interactive content and applications for mobile devices. The Flex framework is also expanding its role in the Flash Platform, now providing the underlying framework for both Flash Catalyst and Flash Builder. Using Flash Builder, developers can code in ActionScript as well as MXML, so this name change more accurately reflects the tool’s language options. At the same time, we have renamed our Professional Edition so it is now Flash Builder 4.5 Premium Edition. We made the change to Premium so people would not get confused between Flash Professional and Flash Builder Professional.