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I would like to purchase OSX 10.8(Mountain Lion) using my apple account.

The question is am having two mac computers with snow leopard, Can I update both of my mac with the single purchase?

any help?

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Yes. With one purchase you can uptate all your macs that are linked to your iTunes account you own.

How to upgrade to 10.8 on

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They don't need to be under your iTunes account—you only need to "own or control" them. See this answer, which is applicable to ML: – zigg Jul 11 '13 at 15:46

If your macs are using the same iTunes account (i.e. same appstore) you can do multiple updates with one purchase.

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thank you so much,. – Murali Jul 11 '13 at 14:07

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