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I use three different accounts for downloading from the App Store, each in a different country.

When there is an update, I have to connect to the correct App Store to download the update, but sometimes I can't remeber from which store an app was downloaded and so I need to connect to each one in turns.

I would like to be able to find the account I used to download an app so that I can connect to the correct App Store immediately. Also, this would enable me to verify if the app already exists in the App Store of my main account and buy/download it from there.

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up vote 5 down vote accepted

In iTunes you can simply right click the app in question and choose Get Info. On the summary tab you can see the account used to purchase the app. alt text

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I would log in to each account and check your purchase history. That seems like the most direct way to me. This Apple article has details on how to do this.

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I was hoping the information was available somewhere inside the iTunes Library, just not displayed at the GUI, and that I could find that reading some file. – lpacheco Jan 15 '11 at 23:22
And the purchase history is separated in invoices, repeats the app for each update I downloaded and mixes iOS apps with OSX apps. – lpacheco Jan 15 '11 at 23:26

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