About a year or so ago microsoft did away with hotmail and created outlook.com. This change however did allow you to keep all of the information in your old acccount. The account being converted did not erase previous email or contacts.
In some cases it did take up to 24 hours for the mail to show up in the newly coverted outlook account. The thing is your account looks brand new as if you just created it today. If you went through a process of entering a bunch of information and choosing the name again then that means you created a new account with your old name. This would mean your old account was removed because you did not use it in a long time so they deleted it and made the name available for use again.
If you did not create this account today what I would suggest is that you wait and see if this new outlook.com account populates with your old information.
If it does not it is possible that account was marked as inactive and the information was removed. If it had been long enough it would let you use the address again however your inbox contents would be gone.
You may want to contact microsoft on their forums, a moderator will gave toold available to closer at the account and see what happened. It is difficult to get in touch with them however I will provide you instructions.
Go to the following link and click Participate and then click Ask a question on the menu at the top. A box will appear. In that box explain what has happened. Remember to be very polite and give as much information as you can. Here is the link to the forums:http://answers.microsoft.com/en-us/outlook_com/
I hope the above helps you get the emails back.
I would kindly ask you to remember when you are asked to rate my service you are rating me personally. You are not rating hotmail or their procedures or your frustration with the situation which I know is difficult.