Right : so I have a Primary Domain controller based on Windows 2003 Server,which also acts as File&Print Server and DNS server. The domain name is (i won't give the real name,just example) VOO , all users log on to VOO.

The company has a website VOO.RO and email on the VOO.RO domain.

Any computer OUTSIDE the LOCAL/INTERNAL network can access VOO.RO website and email,but when a computer INSIDE the LOCAL network (pc's logging to VOO domain controller) tries to access the VOO.RO email or website,there is an error "page not found". Any other domain is accesible,any email account EXCEPT for VOO.RO (so there is nothing wrong with the ISP,etc) . I cannot use the public IP address of the VOO.RO instead of the DNS,as I have multiple domains hosted on one external physical server...

What is wrong? How can i fix the local pc's to be able to access website and email of VOO? There is something related to the DNS,but what?

Most likely you need to set up a local address in your DNS entries. That way those on the local intranet can access the site. I'm not that experienced, but it's a suggestion that might help.

You broke it.

Contact whoever runs the external server.