Anyone managed to get an original Kindle to download and display .mobi files?

As I managed to download quite a few free/public domain eBooks recently (in .mobi format) I tried to download them from my Piratebox to my iPad and was pleased when then iPad offered to open them in the Kindle app.

I then tried the same using an original Kindle which has a browser, and it connected to the Piratebox successfully. However, when I clicked on a .mobi file, it claimed to have downloaded it, but in fact I ended up with a 0-byte file in the Kindle, which of course couldn't be opened.

Has anyone else managed to get a Kindle to download from a Piratebox successfully?

Really interested into this one.
Would be nice to have some kinddle files in order for the people to get some ebooks!

I avoid buying kindle books or if not possible to get it into a different format (epub, epub .. epub!!), I convert it to myself using calibre, I think.
I don't want to register my Reader at Adobe nor I want a Kindle....

ebook sharing works surprisingly well.

regards Matthias