When an external user tries to access OWA that is published in ISA Server 2006, the user does not receive the OWA forms-based authentication page

The below Microsoft article explains that when using validation methods such as RSA SecurID with the OWA Forms-based Authentication, users do not receive the OWA logon form.

For more information and to find out how to correct this issue, refer to

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Will tablet and Smart phone use be a big part of your OWA 2013 deployment?