Since I don't have a single IM program on any of my computers
I guess I fail the grade
Thankfully 
Really?!!! Holy Cow! OS, ...do you know what that makes you? ...you're a "IM virgin"
When you use IM, ...it'll be like the first time you got a microwave.
You'll say, how on earth did I ever get things done before it. (depending on what you use it for)
If I had to pick up a phone and dial out, or answer a phone, or send an eMail, everytime I wanted to leave a quick message of quick note for someone, or for me to receive a quick note from someone, I'd be pulling my hair out. With IM, I can type in a quick message, ...and if the recipient is online, they can see it and respond immediately, ...or if it's not too urgent, can see & respond when they come online. It's a lifesaver when dealing with people across different time zones.
I just wonder which one of the guys here will be the first to break your IM cherry?
