Mailboxes are on Exchange 2007 in forest A, we have Exchange 2010 in forest B: There is a two-way trust between them.
We will eventually migrate mailboxes into the resource forest B but users will stay in A. Would I would like to do before the mailbox migration is redirect all OWA traffic to the Exchange 2010 CAS servers in forest B and then have the CAS server direct to the 2007 CAS OWA. I have forms based authentication on the 2010 cas server and when I put in my username and password, I get an error Access is denied. The Active Directory resources couldn't be accessed. They may be because the Active Directory object doesn't exist, or the object has become corrupted, or because you don't have correct permissions.
Is what I am trying to do possible? If so, I would also like the redirect to go to a specific 2007 cas server OWA instance.
Thanks
