Same problem here--possibly caused after I upgraded Firefox to version
3beta4. I changed the default browser in 'set program access and defaults' to
IE7 instead of Firefox and I found that I could open the hyper link from
Outlook 2007. Seems to work now, so hopefully problem fixed! When Firefox
releases version 3 again hopefully this problem will be rectified.
Hope this information will help others having the same problem.

"mobamoba" wrote:

SP1 automatically installed yesterday for Outlook 2007, and I now get
"This operation has been cancelled due to restrictions in effect on
this computer" whenever I try to click a hyperlink. I Googled this
problem and tried:

Resetting IE
Resetting IE via Access Defaults
Importing new reg key for HKLM/Software.../htmlfile

I'm out of tricks. Does anyone know of anything else I can do? It's
infuriating that Microsoft released an update that completely screws
with the way I work. My inclination is uninstall SP1 - but then who
knows what other problems that might cause. Anyone know anything I
can do? Thanks.