Currently Being ModeratedDec 2, 2012 4:07 PM (in response to lakeside_michele)
If you already have an Apple ID and email ending @mac.com or @me.com from previous Apple Web services you already have an “appleid”@cloud.com address that goes to the same e-mail box.
All three can be used at the same time
Currently Being ModeratedDec 3, 2012 12:10 AM (in response to lakeside_michele)
You can only have one email account attached to a single iCloud account. You can setup additional @icloud.com email aliases within your existing iCloud account, but they won't be independent email accounts, just email addresses that point to the same account.