How to fix Outlook and Windows if it removes the ‘+’ from your International phone numbers

Another piece of brilliance from Microsoft where if you accidentally triple click on a phone number and bring up the dialing verification screen, Windows decides that you are using their own dialing rules and unhelpfully removes the ‘+’ from all of your phone numbers.  In order to fix this, you need to go to the Control Panel (search ‘Dialing Rules’).  From there, set the dialing region to ‘International Freephone Service’.