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Outlook 2010/2013 can not connect to Exchange 2013 in a coexistence scenario with Exchange 2010

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Hi all,

i have very big problems and no one solution found in the internet help me.

Environment:

Root Domain: "germany.local" hosted on 2 sites (1 DC in Munich, 1 DC in Frankfurt)
 - The 4 new exchange servers (2 on every site) (everyone with Mailbox and Access Roles) installed in this Root Domain.
 - SSL Certificates are created with Enterprise CA on the Root Domain for each Exchange 2013 server.

Child Domains: "muc.germany.local" (site Munich) and "ffo.germany.local" (site Frankfurt).
 - on every site in the child domains located the Exchange 2010 Servers (2 CAS in Array and 2 Mailbox servers on each site)

All our Users are managed and hosted in the child Domains.

I installed the new exchange 2013 servers in the root, because we need to have the feasibillity to failover mailboxes to the other site for our BCP Planning.

After i installed Exchange 2010 SP3, Exchange 2013 + CU1 it looks all very fine.

I created a test account on "muc.germany.local" and created a mailbox on a new exchange 2013 server on munich site.
 - OWA works!
 - ECP works!

- But Outlook 2010 (last SP) and Outlook 2013 wont connect if i setup the new created user Profile in the outlook wizzard.

- totaly confused in the username resolution on outlook wizzard take my exchange 2010 cas array servername.

i dont know why!!! Please help me.

Additional Infos:

Exchange Certificates hold DNS entries:
- autodiscover.germany.local
- SERVERNAME (the NetBios name)
- servername.germany.local
- germany.local

Our Exchange Servers are not connected / reachable from the internet for clients.
For sending / recieving Mails (to/from outside) we using E-Mail Gateways configured as smarthosts on our exchange servers.

Every Site have an own ip range.

Please help me please!

Thanks a lot!!!


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