I have been searching the web for a way to do this but no such luck. My goal is to save a meeting agenda template into an email signature which would be inserted into every meeting invite created by me.
Looking for some clues on how to do this?
Outlook 2010 and newer include the form designer.
File -> Options -> Customize Ribbon, then, in the Right Side pane, click to turn on the Developer Tab.
From there you can design Meeting Request template to your specification.
Then, to use it, you will select:
New -> Meeting Request Using -> (Your Custom Template) from the Outlook Home tab.