But some guys has reported that they want old UI of Hotmail back in their Live account. If you too want that old UI back then you can do this very easily.
Login to your Outlook account and once your page has loaded just click on Gears/ Setting button at the top-right corner and then click on Switch Back To Hotmail option.
It will ask reason for your switching, you can skip it and then you will get your old Hotmail UI. If in future you wanna upgrade then just visit Outlook.Com and login and you will be upgraded.