This glosses over John's problem at SambaXP 2003. When we want to join

This glosses over John's problem at SambaXP 2003. When we want to join
a NT4 domain as a BDC with an existing workstation account (existing
bdc is fine), we fail. Print a friendly error message in this case.

The correct solution would probably be to delete the account and try
again. But even this makes us better than NT: NT4 fails in this
situation with an empty warning message box and an unusable BDC. It
has unsuccessfully tried to suck down the domain database, and thus
has no administrator account to log in after reboot....

Volker
(This used to be commit 1ddeea2179b11cedccf205c7ffea523ee6750b24)