Outlook 2003 - Hyperlinks always open in new instance of IE

[mrp]

In Outlook 2002, when I clicked multiple hyperlinks in email messages, all
the links used the same IE explorer window. I could click multiple links in
a set of messages and then navigate back through the links using the back
button on my browser. But after upgrading to Outlook 2003, if I click
multiple hyperlinks, I end up with multiple, separate browser windows. I
have my browser (IE 6.0) set to reuse windows for launching shortcuts, but
Outlook 2003 seems to disregard this. Any thoughts on how to set Outlook so
that it uses a single instance of IE for all hyperlinks?

Thanks for any suggestions!