Hello, I just wanted confirmation that Windows 2003 server will not accept old samba (pre 3.0.x) SID format : - I tried to make a 2003 join a Samba 3.0.23d, upgraded from 2.x => failed - Tried to join a Samba 3.0.23d out of the box => ok Here is the SID format on "old" box : S-1-5-352321536-3979850313-2462592245-811329360-513 On the new one : S-1-5-21-3605046359-4294347824-417408769-513 Now it will really bother me to reinstall all the computers of my company so that the 2003 server can join the domain. Do you know a workaround to make 2003 accept the old format, like manually entering the domain and machine SID ? Thanks - Charles