The Live Mesh team is working to expand the list of supported devices. If yours isn't on the list:http://social.microsoft.com/Forums/en/LiveMeshMobile/thread/acf3a446-54fd-4ee6-9261-5e8720532ef8 it isn't yet possible to use the installed client and you are limited to the web access via the phone's browser.
-steve
Microsoft MVP Windows Live / Windows Live OneCare & Live Mesh Forum Moderator