When opening a hyperlink from within Outlook (usually Outlook 2003), have you encountered the dialog box titled Locate link browser? I've encountered this irritation more than a few times in Firefox and finally found a solution.
Microsoft explains this as behavior that occurs when an error is returned by the default web browser when opening links from within Outlook. That may be so, but they do not include this simple fix. So much for interoperability.
<UL><LI>Open Folder Options from an Explorer window or the Control Panel
<LI>Click the File Types tab
<LI>In the list that appears, locate and click on URL:Hyper Text Transfer Protocol (this will be near the TOP of the list, not alphabetically sorted)
<LI>Click on Advanced
<LI>Clear the checkbox next to Use DDE
<LI>Click OK to return to the previous dialog
<LI>Click OK again to return to the Folder Options dialog
<LI>Repeat this for URL:Hyper Text Transfer Protocol with Privacy[/list]If you revisit these file associations later, you will notice that "Use DDE" is again checked, but now the correct association appears.