Both Paradox for Windows and Quattro Pro for Windows, a closely related project, started development under beta versions of Windows 3.0, in the spring of 1990. Paradox/Windows ended up delayed about a year beyond its original plan, shipping in early 1993. The reasons were many, but not entirely surprising for a major rewrite, in an OO language with new tools, shifting to a GUI paradigm, on what was essentially a first version operating system. Still it was a big problem for the company and Microsoft managed to ship Access a couple of months ahead of Paradox for Windows, a major marketing win for Microsoft.