Migrate from 8.1 w/LDAP to 9.x?

Has anyone had any experience on migrating from DOORS 8.1 w/LDAP connection setting to DOORS 9.x? Since 8.1 didn't use TDS for LDAP connection, I am very curious about how to upgrade and migrate the stuffs over. Really appreciate if you have anything you can share with me. Thank you in advance.
denny.chiang - Wed Nov 17 16:13:50 EST 2010