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The best way is to block the URL access at user desktop level. CAS redirection or proxying will still allow them to access the US OWA website.
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The best way is to block the URL access at user desktop level. CAS redirection or proxying will still allow them to access the US OWA website.

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The problem with that is they may not be at one of my devices. &nbsp;Blocking the URL will only work if it's my device. &nbsp;I need to block it at the OWA or authentication level.
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The problem with that is they may not be at one of my devices.  Blocking the URL will only work if it's my device.  I need to block it at the OWA or authentication level.

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That sounds like a good idea. &nbsp;I'll give that a try. &nbsp;I could just use domain users instead of authenticated users. &nbsp;Domain users would limit the users allowed to sign on just to my domain. &nbsp;Thank you
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That sounds like a good idea.  I'll give that a try.  I could just use domain users instead of authenticated users.  Domain users would limit the users allowed to sign on just to my domain.  Thank you

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I have multiple domains in an Exchange 2010 setup. &nbsp;One domain is in Europe and one is in the US. &nbsp;How can i stop a European user from going to the US OWA server and logging in ? &nbsp;Currently, if a European user goes to the US OWA site and enters europeandomain/username and his password, he connects. &nbsp;I want to change this so only US users can log into the US OWA server using the US domain. &nbsp;Thanks
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I have multiple domains in an Exchange 2010 setup.  One domain is in Europe and one is in the US.  How can i stop a European user from going to the US OWA server and logging in ?  Currently, if a European user goes to the US OWA site and enters europeandomain/username and his password, he connects.  I want to change this so only US users can log into the US OWA server using the US domain.  Thanks

Exchange 2010 -

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.