Apple is finally dropping support for logging into the iTunes Store, App Store, and iBookstore via an AOL username and password. The company has emailed users with AOL accounts attached to iTunes to indicate that login support will end on March 31, 2015. Here's how the entire email sounds like:
Apple has also added a support document to its website stating customers must convert their AOL username to an Apple ID account in order to maintain access following the deadline. You can follow the link at the end for the instructions on converting an AOL login to an Apple ID.
Users just need to login to iTunes with their AOL account and the conversion process will be offered. Also, you need to know that the conversion does not affect the main AOL account’s usage with AOL’s services.