OWA:Unable to display mails in IE 5.0 .

Using Outlook Web Access I am unable to view mails,contacts, sent mail etc except the Calander. However, I can view all information if I use Internet Explorer4.0.
I have checked and cross checked all features
in IE 5.0 that would allow me display the pages. I installed IE 5.5,then 6.0 and still
have the same experience. Within my intranet
everything works fine.Over the internet ,the
superior browser would not work.
What could be the snag? Please help.
Edem
Edem@demsen,com