[Samba] Samba 3.0 PDC installing Exchange 5.5 SP4

[Mario]

We have a Samba 3.0 PDC and and Exchange 5.5 mail server, when we try to
upgrade the exchange server to SP4 a Dr. Watson error pops up

Dr. Watson
 Application exception occurred:
         App: exe\exupdate.dbg (pid=366)
         When: 11/10/2003 @ 10:17:16.218
        Exception number: c0000005 (access violation)


 The error does not occur on a native NT 4 domain, and poses no problem on a
Exchange server which has been upgraded on an NT4 domain and then transfered
to a Samba PDC. Any suggestions would be greatly appreciated.
Thanks