All mailboxes is on the Exchange 2010, and all is working fine.
I have installed an Exchange 2013, and they can see each other, and everything looks fine.
I have migrated a couple of test mailboxes to the Exchange 2013, and they cant connect through Outlook 2007.
The error is that there is no connection to Microsoft Exchange, and that Outlook has to be online.
If I on the LAN connect to the Exchange 2013 OWA with the moved users I can send and receive mail - the Exchange 2010 is still the HUB Transport server.
Off course I cant move the users mailboxes before this is solved, so please help me solve this.