WordStar, originally from MicroPro, was a popular word processor during the early 80s. It was ported to a number of CP/M architectures as well as Unix and PC/MS-DOS. It competed directly against many word processors, including WordPerfect, Microsoft Word for DOS, and Multimate. By the late 80s most business word processing had moved to WordPerfect. In the early 90s, Microsoft Word for Windows took over.