Currently Being ModeratedFeb 18, 2013 1:17 PM (in response to JUnwin)
Was this originally a MobileMe address? If so, did you migrate it to iCloud before 1 August last? If it was, and you didn't, the contents of your MobileMe account (including all the store emails) have been deleted and are not recoverable by any means.
If you did migrate the account you can sign in with the address in System Preferences>iCloud (Lion 10.7.2 minimum required) and enable Mail in the checklist there; you will then be able to access its contents.