samba - Feb 2006 - Samba MS Small Business Server 2003

I have a Linux server running as a PDC.
Has anybody out there successfuly set up a MS Small Business Server 2003 
to run as domain controller on the same domain name ?
Or is there any way to have the 2003 running as a server for more than 
the 7 days provided for the migration purposes ?

Thanks,
Alex