I recently found two synchronizers that may just work with lotus organizer 6.1 through mobile 5 and mobile 6 devices.
1). laplink PDASYNC
http://www.laplink.com/pdasync/
2). Nokia Intellisync Handheld Edition
http://www.sync.com/is_desktop_main.html?p=g&ag=9&a=1&gclid=CIPb_qu8hI8CFSOPgQodKANkww