Password synchronization Lotus & iSeries

Back in version 5.x, there was a AS/400 single signon that I could change a Lotus password and it would carry through to the iSeries. With the upgrade to 6.5 is there anything that will allow this to continue to happen. I believe we lost this function in version 6.0. We have many users that hate changing passwords multiple times…is there something that will allow us to change the iSeries password that can carry through to Lotus or vice-versa. Diane