HT201581: Find your Mac's serial number in About This Mac or System Information
Learn about Find your Mac's serial number in About This Mac or System Information
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Oct 13, 2013 6:32 AM in response to umme1201by Lexiepex,You have to upgrade first to SnowLeopard (paid CD), then update SL to 10.6.8, and then you can (internet Appstore) upgrade to MountainLion (paid, with apple ID) directly.
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Oct 13, 2013 6:34 AM in response to umme1201by Lexiepex,BTW: only the first Macbookair can not upgrade to MountainLion, the max is Lion 10.7.5 on that one. All other Macbookairs can upgrade to MountainLion.