Hello everyone. Finally I've made a decision to buy MBA. After many deliberations I resigned from X220. The thing is which size and resolution would be appropriate for me? I'll be using MBA for typing in Word (90% of time) and web browsing (10%). Another doubt is a battery life. X220 is able to keep 9 hours. I'm going to type for about 6 hours/day without charging... It will be my first Mac. Ps. How about .doc files created on Lion? Are they compatible with the windows' version?