Default Font for Client/User

Is it possible to change the default font and color using the client per user? We are running GroupWise 14 and our executive director would like to use a different font and color. I know where to change it on each email, but cannot find a place where it can be set at the default. She is under the impression that I have already "programmed" this once, but that isn't true as I have no idea how do even do that :)

Not sure what's wrong with plain old black on white, nice and easy to read IMO.