Just got an MBA. I've used OSX pretty extensively during school and work but have never owned one myself so I've got a few basic (?) questions about the system. Firstly: how does iPhoto work. If I copy photos from an external drive or memory card onto the harddrive (and into a folder) then load them into iPhoto are they duplicated? Meaning is iPhoto simply organizing them or are they being stored in an iPhoto database with real copies of the photos. Can I delete the folder of photos from Finder or will this break them in iPhoto? Also, the photostream albums automatically generated (monthly) through my iCloud account: are they on my computer as actual files or are they deleted after 30 days like photos on the iOS photo stream? Next question: I've got a whopping 10gb of Mail stored on my MBA from my GMail IMAP account. How do I delete this and just read mail off the server?