The history of computer word processing applications can be divided into three main periods, each tied to a specific platform transition. In the first period–the late 1970s and early 1980s when CP/M machines dominated the microcomputer market–WordStar was the gold standard. After the IBM PC came along and MS-DOS displaced CP/M, WordPerfect similarly overtook WordStar. Then, as Windows was finally accepted by the masses at the start of the 1990s, Microsoft’s Word usurped WordPerfect as the one word processor to rule them all. (And if we extend things to the present, in the post-PC age there is effectively a commercial word processing duopoly with Microsoft 365 and Google Workspace.)