Your Apple ID was just used to purchase from Apple Online store on a device that had not previously been related with ID. You may also be getting this e-mail if you reset your password since your previous order.

If you made this purchase, you can ignore this e mail. It was only sent alert to you in case you did not make the purchase yourself.
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If you did not make this purchase, we recommend that you go to to modify your password, then see Apple ID: Security and your Apple ID for more support