"Do I still enter imap-mail.outlook.com and change the port to 993"
Only if your account has been transitioned over. Have you logged in and checked the background color of the "Outlook" logo in the top left? If black/navy then yes. Note: You aren't "changing" anything. You can't change the settings of your current WLM profile. You have to create a new one as if it was a new email provider, because in essence, they are.
"Instead of email@example.com I enter firstname.lastname@example.org, correct?"
Incorrect. AFAIK you use the same email and password as you do for hotmail. New users to Outlook.com need to create outlook.com email address, but the older hotmail.com email address are still grandfathered in. The difference now is how you are accessing that hotmail account. See here for a complete break down for explanation. It is natural to be confused, the whole thing is FUBAR.
Since you have other email providers, have you thought of forwarding the hotmail email to another account? Maybe put a forward and message rule telling people your "new" gmail/other email just so you don't have to deal with Microsoft anymore. See here for instructions. I have a feeling this is going to get even worst as Microsoft transfers from IMAP back to exchange support once all hotmail users have been integrated into Microsoft servers.
Edited by Trikein, 28 August 2016 - 11:33 AM.