i have an imac with os x 10.5.8 and want to upgrade. how do i upgrade to 10.6.8 or higher?
Click here, check that your Mac meets the requirements, buy and install the DVD, and then run Software Update.
If you are looking to upgrade so you can sync or register an iPhone or other Apple device, you only need to upgrade to OS X 10.6.8 so you can install iTunes 10.7.
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