When OS X Lion was released earlier this month, some users were inadvertently charged multiple times for the purchase.

[ad#Google Adsense 300×250 in story]In an email sent to customers on Saturday, Apple apologized for the error.

“We are contacting you with regard to your pay service account, which due to an error was charged multiple times,” reads the email sent to customers. “We have identified and refunded the charges to the payment source. The funds should be available within 3-5 business days. We are sorry for any inconvenience this situation may have caused you.”

If you were overcharged, you should receive one of these emails today.

The email also advises customers to visit the online Apple Store for their country if they have further questions about their account.