what's tied to my Apple IDs?
Unfortunately I have two Apple IDs. Given that there seems to be no hope for merging them, is there a way to determine what licenses and files are associated with each?
To confirm which ID was used to purchase a file, right-click on one of your apps, tracks or other purchases in iTunes, then select "Get Info". That will display which account was used to purchase the selected item.
You you can also log into a particular Apple ID account and check your purchase/billing history.
