Hi, my dad is finally willing to switch to mac due to his windows computer finally dying on him. A few questions do come up: 1. Should I recommend the upgrade to max memory? He will mainly be using this for email, Internet and iTunes. 2. Can he leave this running at all times? Or would he need to shut down when not in use? I'm only asking due to the small size, any overheating issues with leaving it on? 3. He got about 4-5 years out of his windows box based on his usage. Can he expect the same out of a mac mini? Again the reason I am asking is due to the size/heat issue. Thanks for all who take the time to read and respond.