I have running samba 2.2.2 with Exchange 5.5. The samba is PDC (configured like suggested in Samba-PDC-Howto). All works fine. -- best regards Uwe Melcher o3sis IT AG Systemmanagement Olper Str. 33 D - 51491 Overath Fon: +49 2204 747 254 Fax: +49 2204 747 222