exchange 2010, exchange 2013

I having 2 separate problems in two offices.

In one office

1) outlook web app works but outlook client does not connect to exchange 2013 server
2) outlook does connect to exchange 2010 but outlook web app doesn't work in exchange 2013

in 2nd office
1) outlook web app works but outlook client does not connect to exchange 2010 server
2) outlook does connect to exchange 2010 but outlook web app doesn't work in exchange 2010

If you can share your views.
pramod1Asked:
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Nathan HawkinsTechnical Lead - Network SecurityCommented:
The outlook not connecting to the exchange server in both cases can be a certificate issue. The SSL certs must be trusted (either from a commercially trusted CA or you import the cert into the computers trusted root CA folder).

OWA access, is a permissions thing. Somewhere the permission isnt set right for the user(s) that cannot access OWA. Has anything changed in either environment?
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mark brownCommented:
In Outlook, click the "File" menu option and see if there is a check mark beside "Offline". If there is, click "Offline" in the File menu to allow the client to connect again.
Screenshot-1.jpgalso Check the below link to troubleshoot connectivity issues.

https://testconnectivity.microsoft.com/
and
http://www.techrepublic.com/blog/smb-technologist/troubleshoot-outlook-connectivity-with-these-quick-tips/
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Timz0rCommented:
You should have both Exchange URLs (internal/external) within the local DNS at each office.
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Nathan HawkinsTechnical Lead - Network SecurityCommented:
@Timz0r - Great point. You need to go to the virtual directories tab and insure that all of your internal/external URLs are set correctly. That in addition to improper DNS records could add up to the way things are connecting (or not connecting...)
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