Lo these many years ago, I worked for a company that used a Wang VS system. We were testing some voicemail thing they were trying to sell us. As I recall, the Wang system wasn't smart about detecting when someone hung up the phone and you were supposed to hit the "#" key on the keypad when you were done with it. We had a training class where one of the women in the department was going over the functions from the phone keypad and she said "Always pound off the Wang". I was snickering for the next week.
Actually, on the web UI there is an "Options" pull down when you're composing a message that allows you to toggle "Format as HTML" or "Format as plain text", so you don't even have to hit preferences.
We've still got a number of DEC Venturis 133Mhz Pentium systems on our manufacturing floor. They are now running Thinstation, talking RDP to Windows terminal servers. The things are built like a tank and they still work great.