Hello,
I recently migrated to Exchange 2013, autodiscover.domain.com and mail.domain.com are pointing to CAS 2013 for external and internal access. For EX013 users, Outlook establishes connection with both CAS 2010 and CAS 2013 which is fine. For EX2010 users, Outlook establishes the connection only with CAS 2010 for both internal and external access. My understanding is that CAS 2013 should proxy the connection to CAS 2010, but it doesn't and also after the migration I have to remove and add the profile again for the changes to take effect for the migrated users. I haven't changed the namespaces, its the same. Any suggestions would be much appreciated.