Outlook client behavior when migrating from exchange 2010 to 2013

Hi Everyone,

I have two questions about exchange server migration. When I migrate a mailbox from exchange 2010 to 2013 server, I get an error in the outlook client saying that the administrator has made a change and outlook needs to be restarted(no big deal, I can live with that).

When outlook is restarted it fails to connect to the new exchange server. The fix is quite easy, I open up the account settings and hit repair:

What I notice after this(outlook is restarted and it connects successfully) is that the mail server ID has changed to a random string rather than "exchange.domain.com"

So two questions:

1. Why is my mail server ID like that. Have I setup something wrong in AD?(the old mail server has it's DNS name)
2. Is there a way to make it so outlook doesn't have to be "repaired"

Other than this, everything appears to be working fine. Users still on exchange 2010 can email 2013 users and vice versa.

I am running Exchange 2010 SP3, and Exchange 2013 CU6. Outlook 2013 client is version: 15.0.4569.1506

Thanks!