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

By default, the default email signature will show when sending a meeting invitation.

The end users can untick it if they don't need it, and IT can disable it company-wide for all users.

IT Pro: How to turn off company-wide (manifest version)

The add-in manifest version is required since you need to modify the XML.
Need remote help? > Pick our time slot (30 min.). 

1. Save a copy of your manifest XML before modifying it.
2. Remove the below 2 elements from the manifest XML to turn off auto-insert for appointments:
   
   

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

   
   

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

3. Deploy the updated manifest XML (remember it takes ~8+ hours).