HT and Exchange 2003 Interoperability

I am running Exchange 2003 and transitioning my organization to Exchange
2007. I have already installed the CAS servers, applied SP1 and now trying
to install the Hub Transport Servers.

Questions:
1. Does the HT require SMTP to be installed?
2. I receive an error message when I apply SP1 stating that the installation
could not find a SMTP connector for *.*. or SMTP service. Do I need to
create a connector on 2007 or shouldn't the HT be able to route mail via the
existing Exchange 2003 routing group it is in and the SMTP Exchange 2003
connectors which are governing this routing.

Rustom
Tue Mar 04 13:40:03 CST 2008

Exact Error

Summary: 1 item(s). 1 succeeded, 0 failed.
Elapsed time: 00:00:08


Hub Transport Role Prerequisites
Completed

Warning:
Setup cannot detect an SMTP or Send connector with an address space of '*'.
Mail flow to the Internet may not work properly.


Elapsed Time: 00:00:08



"Rustom" wrote:

> I am running Exchange 2003 and transitioning my organization to Exchange
> 2007. I have already installed the CAS servers, applied SP1 and now trying
> to install the Hub Transport Servers.
>
> Questions:
> 1. Does the HT require SMTP to be installed?
> 2. I receive an error message when I apply SP1 stating that the installation
> could not find a SMTP connector for *.*. or SMTP service. Do I need to
> create a connector on 2007 or shouldn't the HT be able to route mail via the
> existing Exchange 2003 routing group it is in and the SMTP Exchange 2003
> connectors which are governing this routing.