We have Exchange 2013/2010 environment(coexistence). 2 CAS and 2 MBX( in DAG) servers for every Exchange version. One AD site. Ex 2013 CAS servers are published to the Internet. DNS names(virtual folders and mail flow) links to Cas 2013. In Exchange 2010 we have the same name for virtual folders and for RPC connection (mail.domain.com). Therefore we have nlb cluster, cas array, rpcclientaccessserver (on databases) as mail.domain.com.
Now when we move mailbox from Exchange 2010 to Exchange 2013 Outlook says to restart it and after restart it is disconnected. Profile server is not changed to GUID. If we create a new profile using autodiscover all works as expected.
MS test connectivity is also fine. How should we proceed to migrate users without outlook interruption?