The most immediate change for long-time users was the user interface (UI). Macromedia products had historically possessed floating panels and a distinct aesthetic. Flash CS3 adopted the "Adobe Standard"—docked, collapsible panels and a sleek, dark gray aesthetic consistent with Photoshop and Illustrator. This reduced the learning curve for designers crossing over from print to web design.
In 2007, the mobile web was beginning to explode, but it was a fragmented landscape of different screen sizes and operating systems. Flash CS3 shipped with Adobe Device Central, an emulator that allowed developers to test their Flash content on various mobile skins (mostly feature phones and early smartphones). It was Adobe’s first serious attempt to push Flash beyond the desktop browser.