Hello, First of all sorry for my bad english. I decided to switch to Mac. But I have lots of questions: 1) What should I now before buying a Mac? 2) Do I need an Antivirus software for my Mac? 3) I am getting a 15'' MacBook Pro with retina, so how long is lifespan of battery 4) When will I need to replace battery? 5) How much does it costs to upgrade RAM or change battery after buying? 6) Is there a good alternative to Apple USB superdrive? 7) Can I watch blue-ray CDs if I connect a blue-ray drive to my Mac? 8) I am going to use it for a very long time (4-5 years). So will it able to run smoothly and run Apps and programs? 9) What are the tips and tricks for Macs? 10) Can I get OS X mountain lion ''feel'', like leather texture on iCal or old iOS folder texture, etc.? 11) Will iOS 7 design come to OS X 10.10? I don't liked iOS 7 design and I don't want to see that neon colours in my laptop. so will Apple bring iOS 7 design to Mac with OS X 10.10 (Syrah?) Thank you!