Hotmail.co.uk to Outlook.com upgrades: Your questions answered
My Hotmail account has been changed to Outlook.com. How do I switch it back?
Unfortunately, you can’t. When Microsoft launched the preview version of Outlook.com last summer, users that trialled the service were given the option to switch back to Hotmail.
Since Microsoft officially retired the Hotmail brand (along with its familiar user interface), this option has been revoked, meaning if you’ve been automatically upgraded to Outlook.com you're stuck with it.