I have my original iTunes ID from 2003. It is also my Apple ID for the store. It is not an e-mail address. I also have a .mac address that is also a .me. That address is my iCloud ID. For those of you concerned that iTunes match requires an e-mail ID, rest assured that you old ID is fine. DO NOT convert old non-email ID's to e-mail. It is safe and wise to continue to use it. I have no legacy problems with the old ID. All my purchases link to one ID. Thus I have two separate ID's. One for iTunes Match and one for iCloud.