Make sure Firefox is set as your default browser: Make Firefox your default browser

What happens when you attempt to hope a link with Firefox?

It's possible that you have not set Firefox as your default internet browser, which would make your computer open a link in another browser. See Make Firefox your default browser for information on how to make Firefox the default internet browser on your system.

Firefox is set as my default

What happens when you attempt to open a link within Outlook?

I get " This operation has been cancelled due to restrictions in effect on this computer. Please contact your system admin.

Microsoft has some more information on this issue. Refer to their Hyperlinks are not working in Outlook page.

I tried the fix (download) on the page you referenced. Installed- rebooted and IE had taken over. No trace of Firefox. I re-downloaded FF and installed, made it the default and the links within Outlook now work. I don't know why but it worked. Thank you for your help. Now if I could figure out how to get a shortcut of FF (only) on my desktop!

I am glad to hear that your problem has been resolved. If you haven't already, please select the answer that solves the problem. This will help other users with similar problems find the solution more easily.

Thank you for contacting Mozilla Support.