samba - Oct 2008 - Users Profile PDC.name instead of DOMAIN.name

I'm not sure if this is a problem or not.

When a user logs into our domain the user profile in Windows is listed 
as PDC.name where PDC is the name of our domain controller and login 
server. It seems to me the user should be listed as DOMAIN.user, just 
like it is in all of the domain query utilities. Samba 3.0.28a Ubuntu 
8.05 LTS

I'd appreciate any insight in to this anyone can give me.
-- 
Robert Steinmetz, AIA
Principal
Steinmetz & Associates