[xmind2006]

You need to have a java emulator installed, such as Intent's Midlet Manager or Esmertec's Java emulator. Once you have either of them installed, when you click on the download file (should be a *.jad file I believe), Intent or Esmertec will automatically start up, download the rest of the java application (believe it is *.jar file), and install it. Now to use the gmail app you can open up the java emulator you have installed and click it from that menu or create your own shortcut with the correct parameters (don't know what they are) so it is a "one-click" operation.