Borland Delphi has long been regarded as the most advanced and most productive integrated development environment for Windows. As the first solution to bring an object- oriented language to mainstream corporate development, Delphi and Delphi developers have long blazed a trail toward rapid application development (RAD). Since the first release of Delphi in 1994, Borland has added many new features that streamline development of Microsoft ® Windows ® API-based applications, culminating in Delphi 7. Now, Delphi 8 brings these same capabilities – and many more – to the Microsoft ® .NET Framework. This paper outlines how the latest versions of Delphi enable the highest productivity for both Windows API and .NET Framework development, and how Delphi delivers a smooth transition between these two worlds. Delphi 7, designed for Microsoft ® Windows XP, ® includes many significant innovations to streamline application development, including new IDE options, an updated compiler, new project types and remote debugging. For significantly improved productivity, Delphi 7 Architect includes model-driven development, which can dramatically cut the time needed to create and maintain systems.