Read a ton on this topic and may have confused myself now. The specific question is what IP Address should my Public DNS point at for legacy.MyCompany.com would it be different than the IP Address for owa.MyCompany.com so that owa points at the new
Exchange 2010 and the legacy points at the old Exchange 2003?
Currently all three DNS entries point at the same Public IP Address, is that wrong?
owa.MyCompany.com points at 205.xxx.xxx.xxx
legacy.MyCompany.com is a CNAME for owa
autodiscover.MyCompany.com is a CNAME for owa