Exchange 2013 and Outlook 2013 - no connection

Hi, I set up a new Server with Exchange 2013 and a new DC server.
from a Windows 8 Computer all works fine: I can connect Outlook 2013 to Exchange
from a Windows 7 Computer only OWA works, Outlook with the common error: " Connection to Exchange server...

-> DNS is set up
-> Certificate is copied to all Computers (is a private one as this will be a small environment)
-> Outlook Anywhere is working

This is urgent - please help.
Thank you,
Who is Participating?
Simon Butler (Sembee)ConsultantCommented:
Even on a small environment, you should be using a trusted certificate.
The self signed certificate created by Exchange is not supported for use with ActiveSync and Outlook Anywhere. When you can get a certificate for less than $80/year, trying to get self signed certificates to work is rarely worth the hassle. You also don't have to tell users to ignore SSL warnings when accessing OWA.

As Exchange 2013 is all web services, the most common problems are due to SSL certificates, along with getting the DNS settings incorrect, wrong host names or host names not resolving etc.

David Johnson, CD, MVPOwnerCommented:
Run the analyser from that machine
Wolfi_Author Commented:
Hmm, Simon, think you are right...

I tested some other things posted here but nothing helped at the end.
Will get a Certificate and try again.

Thanks for help.

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