I am getting this message:

You're currently signed in with an Office 365 email account, which can't be used with Outlook.com. Please click here to sign out of your Office 365 account, then use another Microsoft account to sign in to Outlook.com (for example, your hotmail.com, live.com, or msn.com account).

All I want to do is sign in to my outlook account using my Microsoft account id. I don't have a 365 account, never have, never used 365. So how can I sign out of it?