I just bought a macbook pro. 15.4 monitor with i7 processor. Bought it because I want to get into app development. Hopefully the transition will go smoothly. I have been a pc user since 95. I can only say why didn't i switch later. I have a few questions. Will i need a anti spyware or virus checker? Can i leave the laptop plugged in when not in use? Can i leave it on with the lid closed when not in use?