The Macintosh was too radical for some, who labeled it a mere "toy". Because the machine was entirely designed around the GUI, existing text-mode and command-driven applications had to be redesigned and the programming code rewritten; this was a challenging undertaking that many software developers shied away from, and resulted in an initial lack of software for the new system. In April 1984 Microsoft's MultiPlan migrated over from MS-DOS, followed by Microsoft Word in January 1985. In 1985, Lotus Software introduced Lotus Jazz after the success of Lotus 1-2-3 for the IBM PC, although it was largely a flop. Apple introduced Macintosh Office the same year with the lemmings ad, infamous for insulting potential customers. It was not successful.