http://www.macnn.com/articles/01/09/25/quark.5.5:/
Quark 5.5: native OS X version in development
updated 09:20 am EDT, Tue September 25, 2001
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A Macworld UK article reports that "Quark sources have already confirmed that XPress 5.5 – a Mac OS X-native version – is in development [and] will support Multiple Undos - a feature long desired by XPress users."
