MobileMe account and Apple ID are one and the same
Summary
Learn how MobileMe (or .Mac) accounts may be used to access Apple resources that use an Apple ID.
Products Affected
MobileMe Account
You can use your MobileMe (or .Mac) account name and password anywhere an Apple ID is required, such as in Apple Discussions, the online Apple Store, or the iTunes Store. When logging in to services other than MobileMe with your account, be sure to enter your account name as your full .Mac or MobileMe email address.
Additional Information
To login to My Info, where you may view and edit your Apple ID, click here.
To learn more about My Info and using an Apple ID, please see the Frequently Asked Questions.