Would like to know if it is a totally absurd exercice to try and go through the following steps:
1. install a build environment for Zimbra-J2ME-client
2. use the phone to recognise your settings. This can be done with the application available from the website of J2MEPolish edition. This will upload the features of your phone to their website.
3. recompile everything with the makefiles set for your device. If you take a device, which is not too different from the ones currently available there should not be an enormous problem.
4. upload to your device and obviously test. Myself I have got Nokia E71, E61 should be similar and is available.
Or maybe I am just dreaming and missing something,
there must be a way of compiling for more than a handfull of devices.