Hi,
I have one Exchange 2013 CU10 server and have deployed a single Exchange 2016 server. Exchange 2016 is configured and a valid SSL certificate is installed.
Namespaces still resolve to Exchange 2013 and as I understand it unlike previous versions I do not need to change the namespaces at this stage if I don't want to and Exchange 2013 should be able to proxy requests to Exchange 2016 for mailboxes that I move.
However, I get 404 page not found errors when accessing Exchange 2016 mailboxes via the 2013 CAS server. This also affects Outlook, Outlook won't connect to the mailbox (repeated password prompts). If I make hosts files entries to resolve namespaces to Exchange 2016 then I can open Outlook and OWA, I can also access 2013 mailboxes via the Exchange 2016 server. OA, EWS, OWA, ECP are configued the same across both servers i.e. same authentication methods.
Thanks.