issues with OWA in multiple sites Exchange 2003/2007 environment

[rwvoss]

I am partially through an upgrade from Exchange 2003 to Exchange
2007. My main site is pretty much completely moved over to Exchange
2007 except for the exchange 2003 server still being around for mail
flow.

I recently installed an Exchange 2007 server at the remote site and
put 1 test account on it. I was testing OWA I am having an issue with
the client access server proxy. Below is my basic setup:

CHS01 - Client Access/Hub Transport on main site
EXMB01 - Mailbox on main Site

Remote01 - Client Access/Hub Transport/Mailbox server at remote site

Currently we have a redirect so http://exchange.company.com goes to
https://exchange.company.com/exchange so it will automatically
redirect 2003 to the old OWA and 2007 to the new. However, when I try
to log into the mailbox on the server in the remote site, I get an 403
error. If I manually go to https://exchange.company.com/owa, it
works.

I do not have an external url set for remote1. I have also set it up
to use integrated authentication. Does anyone know what I need to do
to get this to work or is it a lost cause?