I accidently created two e-mail addresses, and wanted to know if I can delete one of them.
Is it super important that you delete one? I'd just use the one I wanted, and whoever you signed up for email with will deal with the other eventually.
You do not need to delet the second address. I myself have 6 email addresses, at different sites, for different reasons.
A good way to keep them separate is to make one your primary email for business related things, and the second address for all your personal emails.
Managing multiple accounts becomes easy as pie with a client, like Outlook or Thunderbird. I really don't know how people get by with one account. It's like wearing one shoe. )