How to turn on the email signature when sending a meeting invitation

End users can tick the signature option if they need it, and IT admins can disable it company-wide for all users.

IT Pro: How to disable company-wide (from manifest)

This requires modifying the manifest XML.
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1. Save a backup of your current manifest XML before making any changes.
2. Add the following two elements from the manifest XML to stop the auto-insert of signatures in calendar invitations:
   
   

   <LaunchEvent Type="OnNewAppointmentOrganizer"
                FunctionName="insertDefaultSignature" />
       

   <LaunchEvent Type="OnAppointmentFromChanged"
                FunctionName="onMessageFromChanged" />
       

3.  Deploy the updated manifest XML  (Allow approximately 8+ hours for rollout).