When I clicked to open links in my outlook I encountered this error :
“This operation has been canceled due to restrictions in effect on this computer. Please contact your system administrator”.
I searched and most of the solutions were for resetting default programs. Change default programs and reset IE to default . None of them did help me .
I found new solutions here.
The second solution about changing a registry key helped me. but I found the html key not in HKEY_CURRENT_USER but in
HKEY_LOCAL_MACHINE
> Software > Classes
find .htm & .html
in both change the Default String values ( in my case there were Opera.html ) to HTMLFile
save and close and after restarting outlook , links opens fine in IE. 
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