Fortunately I don't need to ponder this question any longer. Today I received an email which simply would not have had the same impact back in the old days of low-tech correspondence.
The email started out with the following, which is a direct quote:
Starting IMMEDIATELY - ZERO TOLERANCE for any and all non compliance of the following process!
It looks pretty menacing in ASCII text, but thanks to Microsoft Exchange and its mind-blowing capabilities to allow more effective self-expression I was able to receive that motivational phrase in a 24-point underlined red font.
I have to admit, it's difficult to fully realize the gravity of the phrase without gratuitous aesthetic enhancement. Let's face it, it would take a PowerPoint attachment to more effectively intimidate me.