Release Date: November 6, 1989.
WordPerfect Corporation released the program's most successful version, WordPerfect 5.1 for DOS, which was the first version (aside from the short-lived WordPerfect 5.0) to include (text-based) Macintosh-style, CUA-style, pull-down menus.
The data format used by WordPerfect 5.1 was, for years, the most common word processing file format.
All word processors could read (and convert) that format, and many conferences and magazines[which?] insisted that people ship their documents in 5.1 format.
With the release of later versions of WordPerfect (for Windows), and an accompanying change of file format, a presumably final update of 5.1 was released which could read and write to the new format.
The previous text-based versions used different colors or text color inversions to indicate various markups, and (starting with version 5.0) used a graphic mode only for an uneditable print preview that used generic fonts rather than the actual fonts that appeared on the printed page.
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