Outlook: start an application with a trigger (rule)

The problem:

Recently Microsoft has removed this option for security reasons with this update: May 2, 2017, update for Outlook 2016 (KB3191883) but luckily we can restore it with a simple registry hack. Before this update we can create a new Rule for the inbox mail in which specify that if a mail meets certain criteria (sender, subject, …) than Outlook can start an application on our computer (simple, without parameters, I think….).

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