OWA failing in certain CLients

Just recently we deployed exchange 2003. Everything works great except a few
issues with OWA.  If I log on to OWA I am able to see and read my emails
just fine.  However, when I open an email and try to reply to it, I get a
window with an red X on the upper left hand side corner. I can't type
anything and when I hit send nothing happens.

 

Any ideas?

Thanks,

Juan

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