The long term goal is to have native clients for all major platforms. We started with Windows as it is the one platform that needed a more secure client the most. Sadly Windows doesn't have the best choice of UI APIs after we elminated Qt for various reasons. A pure win32 interface is being worked on and will yield a much leaner client, though it will take a lot more time.
Care to elaborate on why you ditched Qt? Also, why did you go with Forms and not WPF when you decided to do .Net, and not use Qt in .Net?
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Thomas