Our new Mac computer

Ahhhhh. So we got a new computer, a Mac. It's super nice, but I'm totally annoyed with it right now! I have msn messenger, but I can only get the old version. That means I can't video message with anyone but Mac owners! How silly is that. Our computer came with a built in camera, but I'll never be able to use it cause no one else owns a mac!! If anyone knows something I don't know, please fill me in!!