From now on every user in Hotmail will be automatically redirected to the latest full version of user account. However if you miss the good old Hotmail inbox, you can actually do some easy tweaking to switch / revert it to the classic old version of MSN Hotmail Login Page. Here’s how it is done:

Login to your Hotmail account. After that choose the ‘Option’ button on the top right corner. There will be a drop down menu, in which you will need to click on the “More” option. You shall see this message if you do it correctly.

You are using the classic version of Windows Live Hotmail.
Have a fast connection and want more features? Try the full version to see message previews in your inbox. (It’s free, too.)
You can also Switch to MSN Hotmail.

Yeah, no more full version of Hotmail, just the classic old version of MSN Hotmail