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Microsoft donates the Mono Project to the Wine team
(www.gamingonlinux.com)
This is a most excellent place for technology news and articles.
Ah yeah. Mono didn't support WPF, but Mono did support running WinForms apps natively on Linux without using Wine.
The problem with WinForms is that at least serious 3rd party libraries do a lot of direct API calls I guess, hence Wine.