I have a Mac running OS X Leopard with iPhoto 08. I know to use iCloud I have to upgrade to at least Lion, and if I want to use Photostream on my Mac upgrade iPhoto to iPhoto 11. My question is what photos can I actually use with photostream on the Mac. I know any photos I take with the iPhone or ipad will go in photostream, but what about the photos I already have in iphoto on my Mac, will they be in Photostream too? And what about photos from emails I save on my Mac, will they go into photostream? Thanks for the help in advance.