Apple has updated its Apple ID policy, so account holders can now use third-party email addresses as login credentials to switch to an Apple-provided email address. New customers have been sign up for an Apple ID for some time, using third-party email addresses like those from Google and Yahoo.
You could use your login to another third-party account, but not an Apple domain such as “@icloud.com.” That’s changed.
Before you change your Apple ID email address, you need to sign out of every Apple service and device that uses your Apple ID. If you want to use your iPhone, iPad, or iPod touch to change your Apple ID, stay signed in to your Apple ID on just that device. When you change your Apple ID, you can enter another third-party email address or an @icloud.com, @me.com, or @mac.com email address.