As usual don't click on links to sites that appear duplicitous or tricky in some way.
If you receive an email saying something like "Aprende a leer los historiales ocultos de tus contactos del MSN", well know that it's an ID theft scam.
They will take control of your msn account, steal information and your friends' email addresses as well.
The people sending it MAY not be aware of that, as their accounts are being controlled by others. So I don't think it's fair to report the email address I got it from on here, as the user may not be aware hisher email address is being used without hisher permission and wouldn't probably want it to be made public.
Anyway stay away from it