Error “You’re currently signed in with an Office 365 email account, which can’t be used with Outlook.com”., “I’m willing to provide all the information needed to investigate this issue.”

Tried everything to fix this (tries, used 3 different browsers and 3 different computers. When I try to log in via: http://www.outlook.com/"your edu here" goes to essisi and wont let me log in either. my email address is *********@email.itt-tech.edu. when I type the email.itt-tech.edu after the / dosnt let me log in, if I type just itt-tech.edu it goes to the essisi but again wont let me in. I don't have office 2013 or 365 and don't want to buy them atm otherwise prob wouldn't b an issue lol. Just wanna log into my email by browser please help!!!!!!!!!! Ty tried everything Jen_c said to do too btw http://answers.microsoft.com/en-us/windowslive/forum/mail-signin/error-youre-currently-signed-in-with-an-office-365/64ea673f-6774-4988-bea8-f3b3d76322cd#_self