Use Start-> Default Programs to reset your default browser.
Setting Internet Explorer as the default and then Firefox again also should
do the trick.

Signature
Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
Outlook FAQ, HowTo, Downloads, Add-Ins and more
http://www.msoutlook.info/
Real World Questions, Real World Answers
-----
> I am running Firefox 2 (my default browser), Outlook 2003, and Internet
> Explorer 7. Suddenly, when I click on a hyperlink in an Outlook message, I
[quoted text clipped - 10 lines]
> So, I'm pretty much stuck. Any other suggestions would be most
> appreciated.
LJL - 23 Mar 2008 01:32 GMT
Thanks very much for the help. Setting IE as the default browser and then
Firefox as the default browser solved the problem. -- Lee
> Use Start-> Default Programs to reset your default browser.
> Setting Internet Explorer as the default and then Firefox again also should
[quoted text clipped - 14 lines]
> > So, I'm pretty much stuck. Any other suggestions would be most
> > appreciated.
Roady [MVP] - 23 Mar 2008 14:00 GMT
You're welcome! :-)

Signature
Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
Outlook FAQ, HowTo, Downloads, Add-Ins and more
http://www.msoutlook.info/
Real World Questions, Real World Answers
-----
> Thanks very much for the help. Setting IE as the default browser and then
> Firefox as the default browser solved the problem. -- Lee
[quoted text clipped - 21 lines]
>> > So, I'm pretty much stuck. Any other suggestions would be most
>> > appreciated.