Programming-wise, I think there's a big gap to jump between Windows and Android.
Maybe K-9 to pure Java would be easier?
Another possible option might be to install the Android SDK for Windows (or some other Android emulater) then run K-9 under that.
Anyway, on PCs, I prefer full-function mail clients like Mozilla Thunderbird or Pegasus Mail. The convenient ability to attach a file to an email using drag-and-drop doesn't exist on phones and tablets!
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David W. Jones
gnome...@gmail.comwandering the landscape of god
http://dancingtreefrog.comSent from my Android device with F/LOSS K-9 Mail.