a) Application Message Open
b) Inbox Widget
Make sure your settings for the widget has M3 Application Messages enabled.
Note the neither option A or B automatically refresh, in my view this makes them more pull than push.
In my opinion this is the best option. In this case it is truly a push event. You receive an email when the event occurs. Clicking on the link will launch Smart Office if it is not already started, otherwise it will launch the program on the correct panel, in the correct mode and positioned to the correct field.