Outlook 2007 and default browser

Hi,

1- My default browser is set up to Firefox.
But when I have a link in Outlook 2007 Beta2, and when I click on it, it
opens it in IE.
How to change it?

2- When I click in the link
(http://hqteamtrack/tmtrack/tmtrack....&I=98602&T=1000) it comes in IE
with a 'page cannot be displayed. If I click on refresh, then, it displays
the page correctly. If I'm using webmail, it's working fine.

Any idea?
Cheers