old emails

I did not get the memo about migrating my old email. I did not know hotmail was going away. I thought this account was related to a different email of mine. In any case, I thought it would change seamlessly. So I now do not know where I stand. My problem is I do not know what contacts are using the hotmail account as their link to me. I do not know who to contact or where to send the new email, because I have no history. I don't think I have completed the new login set up process. Could I get opinions about my next step?