Looking at the date of this post, I know that it's extremely old, but I'm suprised at the responses provided. Netscape receives the interface from Exchange in standard HTML format. When you use IE, Exchange OWA detects this and attempts to use an ActiveX control for the IE interface. Most company firewalls will lock down port 3389 (which is what the ActiveX control uses) so you'll get a blank page when you get to the inbox or any folder. This can be changed via a registry on the server, however, the activeX control can't be changed to match the new port number, so it's useless.
