Current domain in Windows 2003. The internal domain name is xx.com (xx=their public domain name). There are approx 50 computers on the domain.
I know for creating new internal domain names, it is not recommended to use the public domain name (this was setup many years ago before this was known to be a future issue).
I am not sure if I should just ignore the "delegation for this dns server cannot be created" message and continue using the public domain name as the internal domain name (has never been a problem) or should I change the internal name from xx.com to sub.xx.com which I know is recommended by Microsoft. Trying to avoid this path due to the obvious disruption and the amount of work involved.