here on how to move your client over, however if you're not very tech minded, or you prefer a more automatic approach, I've made a little tool called Escargot Migrater which should help you out.
The tool does all the hard work for you, finding and modifying the appropriate files based on your version of MSN/WLM and your system architecture.
If you'd like to try the tool, you can learn about the tool and download it here.