Exchange 2010-2016 migration outlook issue

Brass Contributor

Exchange 2010 configured with CAS fqdn pointing to Exchange 2010 servers.

Added exchange 2016 DAG nodes.

Autodiscovery URL of all the servers set to exchange 2016.

Enabled OutlookAnywhere on exchange 2010 and set URL to exchange 2016

OWA,ECP,Activesync  of ALL servers set to exchange 2016


only CAS FQDN still referring to Exchange 2010.

Tested mailbox migration on one test user.

The problem is that with this configuration.
- Mailbox migrated to exchange 2016 are not able to connect.
- Mailbox still on Exchange 2010 still connects.
If I set the CAS FQDN( on the file hosts in the user pc )  to point to exchange 2016
- Mailbox Migrated to EX2016 are able to connect
- Mailbox still on EX2010 do not connect

What can be the issue ?



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