Although the fifth-generation Intel Core i5 processor and Force Touch trackpad are minor updates, this year's 13-inch Retina Apple MacBook Pro is still an easy top pick for high-end ultraportables.... Read the full review on pcmag.com
Essentially, an Apple ID is your passport to the Apple ecosystem of hardware and software. It is an important information that smooths the interaction between you, your hardware, software and services that Apple provides.
I enter my Apple id with password (which I use to log into iTunes store etc etc all the time without a problem) but when I try to add it in the Add Account, Mobile Me part it comes back and says unsupported Apple ID and that it requires an Apple ID which is an email address.