If you can call that "natively export". If I were the judge, I would not accept an evidence thus obtained without asking additional questions. What I call a native export is something like a PC suite for backing up your PIM, with an export functionality. I am not aware of any platform that got it right since Palm OS (but then, I have no clue about WM, iOS and BB). Nokia has tried but did not quite succeed. Jolla has not even tried.
I think you've misspelt "independent developers". Modrana and Poor Maps come to mind.