Exchange 2013 OWA reverts to "Outlook Mobile"

Hello
We have a customer recently moved to Exchange 2013 and some of their users experience an odd issue whereby remote workers at a major blue-chip organisation cannot access the normal OWA interface, instead it keeps reverting to Outlook Mobile interface see attached pic.
These users work in a very secure system any nothing can be changed therefore wondered whether we can force OWA normal mode in any way via URL or otherwise.
This issue occurs in all browsers IE,Chrome & firefox and we think it could be a proxy modifying headers to hide the browser version unfortunately no ability to touch this either.
Exchange 2010 OWA worked fine just issues after migration to 2013.
Thanks
nmxsupportAsked:
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nmxsupportAuthor Commented:
pic attached
Untitled.png
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Simon Butler (Sembee)ConsultantCommented:
If you look at your IIS logs for connection then you should be able to confirm the browser type being sent by the client.

You can adjust the URL to modify the view.

This will give you the two column view:
https://host.example.com/owa/?layout=twide

Simon.
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nmxsupportAuthor Commented:
Yes I expect a proxy server is anonymising the browser but is there a URL that will force OWA rather than mobile access?
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Simon Butler (Sembee)ConsultantCommented:
That is what I have given you.
On Exchange 2013 it is a single URL for all variants.

Simon.
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nmxsupportAuthor Commented:
Ok I see what you mean from this article http://www.looselytyped.net/2013/05/23/handy-outlook-web-access-2013-tips/ is there any way to force Desktop/Laptop mode (3-wide) by default?
Thanks
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Simon Butler (Sembee)ConsultantCommented:
Not that I am aware of.
OWA is designed to auto detect. Unfortuantely the site you are working with believes in security by obsecurity (which will not help and just makes life awkward).

The best thing Ic an suggest is to put a redirect on the root.

http://exchange.sembee.info/2010/cas/default-page.asp

However change the URL to include the variable.

Simon.
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