Hi all,
I am in the midst of a migration from a single Exchange 2010 server to a two-server Exchange 2013 environment (both servers are CAS and MBX with DAG). Everything seems to work fine. I can access OWA on 2013 for mailboxes already moved to 2013, I use ActiveSync successfully but I cannot for the life of me figure out how to enable OWA 2010 proxying through 2013. I have checked many websites, forums etc. for it, I changed Authentication Methods back and forth and did everything I can think of but still... when trying to access OWA with a mailbox that is still on 2010 it fails with the following error:
:-(
something went wrong
A problem occurred while you were trying to use your mailbox.
X-OWA-Error: Microsoft.Exchange.Data.Storage.NotSupportedWithServerVersionException
X-OWA-Version: 15.0.913.21
X-FEServer: <name of 2013 server>
X-BEServer: <name of 2013 server>
Maybe I should add that the new 2013 servers are installed in a completely different AD site which is connected through VPN to the 2010 site. In the new site I also have a loadbalancer in front of the 2013 servers.
Actually I am still not sure if I need a different address in Exchange 2013 for OA, OWA and so on then in Exchange 2010. If I understood correctly there is no need for a legacy namespace anymore so I used the same URL for OA, OWA ... in both environments. This seems to be in conflict with the requirement that the OA URL in Exchange 2010 should point to the 2013 URL?!?
Any help is greatly appreciated!
Best regards
Daniel