Macworld
When you first register for an Apple Account (formerly Apple ID), you can use either a new email address provided by Apple (with an @icloud.com address) or one you already have. You can have multiple email addresses associated with your Apple ID, but only one primary address—the core address you’ll use to log in and to which important Apple Account-related emails would be delivered.
It used to be a pain to change this, involving a multi-step process that you can only do on the web. Читать дальше...