Did you ever get this fixed? I am having a similar issue with OWA 2007. If I use Basic Auth, I do get logged into OWA fine, but if I click a URL or even click Logoff, I am prompted to login. I know that this is happening in OWA outside of the SA, too. If we login with domain\username, it is fine. It is when you login with just username that it requires that second authentication. I'm playing around with different RemoteSSO settings, but nothing has worked yet.
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