Okay we're upgrading a clients server from Small Business Server 2008 running Exchange 2007 to Windows 2012 / Full Exchange 2013.
The 2012 has been joined up to the domain as a BDC (for now, yes I know its not recommended when running exchange) and Exchange 2013 is setup and running. We've been using the following as a guide:
Everything seems to be fine, right up to the point of migrating a test mailbox from 2007 > 2012, it just fails with the following error:
Unable to make connection to the server. (hr=0x80040115, ec=-2147221227)
Quick google suggests that the two servers cannot communicate because the 2012 cannot resolve the 2007 in DNS and NETBOIS. I've checked and ping works lovely between them using the FQDN and just the NETBIOS name.
I've turned off the firewall on the 2008 server but beyond this I'm a bit stuck. Ive been trying the mailbox move in EAC on the 2012 server - with both the destination DB name entered and without - still fails.
Is this a SBS anomilly? The co-existance is only short term until we migrate all the mailboxes to prevent downtime.
For what its worth, the 2007 Exchange was migrated from an SBS2003 server some years back and there may be some traces of that original schema in the setup.