music old ID
Previous ID has an email not longer in use
How can I update apps that were downloaded with that ID -using that email not longer available?
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Even thought the email address is no longer in use, you should be able to sign in, and update apps downloaded with that ID.
Or you can change your Apple ID email address on that Apple ID so you retain access to your data and prior purchases. Note the restrictions in the article.
Make sure you turn off Find My Phone before signing out of the old ID. Once signed out and Find My Phone is off, then sign in with the new ID, then turn Find My Phone back on.
What to do after you change your Apple ID or password - Apple Support * I suggest doing this before you change your Apple ID or password.