To be honest Rich, I would stick with IE, and Outlook Express, we know the bugs, and can download the patches for them.
Netscape is a poor alternative, I am not sure I like the look of Firefox, and it's e-mail sister Thunderbird.

Why are you having to keep reloading IE % OE I wonder?.

Some firewall interact with both IE % OE, but I reckon this should be the same with other browsers.
In answer to your question, I have tried both, and prefare IE.

There may be a problem with OE soon, Microsoft I believe are stopping supporting it.

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Ern