When I last upgrade my iPhone 4 to iOS 5, I later had to install another version of iTunes on my macbook to synchronize my files between my computer and my iPhone. This new version of iTunes required a new version of Quick Time, which took me a long time to find available on the internet.
Now my iPhone says that I need to upgrade to iOS 6. My macbook runs on Mac OS X leopard (10.5.8).
Which issues should I be aware of when upgrading to iOS 6, given my macbook's limitations?