Configuring preferences and options in Outlook.com
Hello,
I appreciate your concern about the Hotmail to Outlook.com
Your Hotmail address and password, saved emails, contacts, calendars, and rules were automatically moved to your new Outlook.com inbox. You have the option to keep your @Hotmail address and/or get an @Outlook.com address.
Note: Once the account is upgraded there is no way it can go back to older interface.
Please post to us if you have any further queries to help you better.