Please bear with me as I struggle to explain why I think I have a DNS
problem. I'll start with some background first.

Our DNS servers are Windows 2003 server.  One of the DNS servers was
upgraded from Windows 2000 the other was a native install of Windows 2003.  
DNS has been running as it is currently for years.  To me and my limited
knowlege of DNS everything looks good.  All our computers are in there with
the associated records and ip address in the forward and reverse lookup
zones.  The two DNS servers seem to talk to each other just fine.  There
arent' any DNS errors in the event log.  All this time everything seemed fine
to me.

A few weeks ago we had some email come back to us as undeliverable.  I have
been working on it for a long time, and have made some progress.  That is
what has lead me to a possible DNS problem as it was pointed out to me while
troubleshooting email.  #1 our internal domain is bsu.com.  In the outside
world we do not own bsu.com.  In the outside world we are bsu.us.  In the
outside world our DNS is mail.bsu.us NOT mail.bsu.com.  Now, it used to be I
could go out to the web and type in www.bsu.com and if I remember correctly
it used to pull up Ball State University.  In any case, in trying to fix my
email problem, it was suggested that we should put an entry in DNS for
bsu.us.  So I created a new zone, put two records in there that pointed to
our internal email server ip address. The records were mail.bsu.us and
syssb0007.bsu.us, the latter being the server name.  Once I did that I could
no longer browse to www.bsu.us.  The MSN search site came up.  I deleted the
zone and viola, I could find www.bsu.us.  --I thought that if an internal DNS
server doesn't have the info it then goes out and queries for it.  I don't
understand why when that zone was there we could not get to our website,
which is hosted outside.  Going back to bsu.com, I can't pull anything up for
that either now.  The MSN search site comes up for that as well.  Not that we
need to get to that site, it's just I think it's because bsu.com is part of
our internal DNS and it's messing us up.

So, what do I do from here?  It was also suggested we change our internal
domain from bsu.com to bsu.local.  I don't mind doing that I just don't know
what the reprecussions are.  Anyone have any ideas or thoughts on this?  
Thanks in advance!