A MobileMe account that you did not move to iCloud is still valid for the following Apple services:
- iTunes Store purchases
- iTunes Store authorization or deauthorization
- Game Center
- Apple Store purchases
- iPhoto purchases
- Apple support pages
When used as an Apple ID, your username includes the @me.com (or @mac.com) of your MobileMe account. You can learn more about Apple IDs.
If you continue using your MobileMe account as an Apple ID for any of the above services, you need to update the email information for that Apple ID to continue receiving email updates related to the account, such as invoices, receipts and other notifications, especially if you make purchases from the Apple Store or iTunes Store. You can change the email address associated with your Apple ID on your Apple ID account page. You can also make other updates, such as changes to your password, address and subscription features, on your Apple ID account page.
Changes you make to your Apple ID are also recognized by other applications where you use the same Apple ID (for example, the Apple Store Online, iTunes Store, or iPhoto). You may be asked to verify your information the next time you use your Apple ID to purchase something in another application.