EndnoteX2 upgrade

I have endnote X1 student version. I’m thinking of upgrading to X2.

Can I upgrade with the Academic upgrade version? 

Furthermore what benifits of X2 version over the X1 version?

I’ve only used X2 and am an Endnote novice, but I remember reading their upgrade features and I was glad that I didn’t have to mess with X1.  That’s probably no help, but X2 is easy to use.