In the process of migrating from Exchange 2010 to Exchange 2016.
Exchange 2010 currently has all our production mailboxes and is working with ActiveSync, Outlook Anywhere, and OWA.
When I move a mailbox from the Exchange 2010 server to the Exchange 2016 server I am unable to connect to ActiveSync as I normally would. I assume this is because Exchange 2010 cannot read Exchange 2016 mailboxes.
What would be the best way to move mailboxes from Exchange 2010 to Exchange 2016 and allow ActiveSync to still work without having to reconfigure our devices to point to a different mail server internet domain for the Exchange 2016 server? Is this possible without reconfiguring the end user ActiveSync devices or moving all of our mailboxes at the same time to the Exchange 2016 server and keeping the same domain settings, just changing the internal routing to the Exchange 2016 server?
I haven't tested Outlook on the LAN to see if autodiscover will pick up the Exchange 2016 server and work that way nor have I tested Outlook Anywhere yet. I assume getting ActiveSync to work will be a similar process for autodiscover and Outlook Anywhere (pointing the mail server domain to the Exchange 2016 server).