I am working on a transition to Exchange 2010 from SBS 2008 and Exchange 2007 SP3. I have Exchange 2010 installed with CAS, HT, and Mailbox roles up and running. I'm sending messages across and everything appears to be working from that point. My problems start with OWA. I only have 1 external URL and want to setup Exchange 2010 as the CAS server for my network for the mailbox transition. I'm trying to get Exchange 2010 to proxy connections to mailboxes on teh 2007 server.
My experience is that when trying to log in I get the FBA page for 2010 OWA, and after logging in I get redirected to the Internal URL of my 2007 OWA. I have followed various articles and posts so that I have copied over the 2007 binaries for OWA, I have removed the external url for OWA in 2007, I have made sure that the OWA virtual directory has only integrated authentication on.
Hopefully I'm missing something easy?