How do I find from kilometers to miles?? I am not sure. Thank you

I see about apple iphone
does anyone knows if it can use microsoft messenger msn?
here is the link
http://www.apple.com/iphone/

thank you

I will have to travel on airplane in few days. I will scare to travel. It is my first time experience. Can you explain to me about travel on airplanes? You who know or experience it before. Thank you.