I have a Web Application, that works perfect on Netscape Navigator, but when I use the method "POST" in a JSP, and use Internet Explorer as Browser, then the application stops working.

I have encountered the same problem when submitting multipart/formdata via POST to a secure webserver (i.e. https). I verified this on Server side, with different CGI's and a test servlet, and submitted a Bug report. However, the bad news is that nobody cared, and there is nothing that can be done about it, despite checking the Microsoft Knowledge Base and waiting for updates to MSIE.

The only real way to react is not to buy or use any of such products, however, we all know that this is hardly possible.