In my experience of using SyncML utilities mail folders are not accessed via SyncML at all. You need to setup a mail account on the phone, or through the Service Providers Blackberry Control Panel if it's a Blackberry. What kind of Phone do you have? I have seen compatibility issues with IMAP on iPhones. If you are able to setup an IMAP account on your phone then there might be a Subscribe facility for you to subscribe to Public Mail Folders.