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In page WordPerfect:

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Once OpenOffice.org appeared in 1999, there was little demand for a proprietary, closed-source project like WordPerfect.[citation needed] On top of this, WordPerfect 9.0, which was released as part of the WordPerfect Office 2000 for Linux package, was not a native Linux application like WP 6–8, but derived from the Windows version using Corel's own version of the Wine compatibility library, and hence had performance problems.