I have an older version of exchange 2003 on a 2003 SBS server.. The company has since added a 2008R2 server with exchange 2007.

I would like to keep all of the setting for IIS and web service and just have IIS re-direct the incoming external mail requests to go to the new
mailboxes on the Exchange 2007. Is there a way to do this and if so do I need to install IIS on the 2007 exchange box.

any help would be great as they are getting up tight about not getting their mail on their phones.