Last Updated on 2017-08-06.
[:en]Using Windows 10 1703, it seems to be impossible to persistantly use a combination of IE11 and Outlook 2010.
Even if both applications are set as default, if you click an HTTP link in an Outlook email, the user is asked to choose a browser. Even if the user chooses to permanently save the setting, the dialog comes up again.
Create a registry entry:
If key “shell” does not exist, create it. Do the same for key “opennew”.
Then edit the “Default” value for key “opennew”:
rundll32.exe url.dll,FileProtocolHandler %1
Also make sure you set the associations via the “old” way, Control Panel -> Default Associations, not via the “modern” menu.