Only Microsoft (who owns hotmail.com and thus registers the e-mail addresses) could possibly know.
So ask your lawyer if he thinks that what was done can be prosecuted, because only then they might be forced to tell the police what they now. I don't think they will tell you if you friendly ask them. But it's worth a try to call your local Microsoft office and discuss it with them.
Someone has set up a fake hotmail account in order to cause problems. This is part of an ongoing problem and the police will be informed. The email is very closely based on my actual email address. I am asking if there is any way to find out who set it up, i.e, who's first and last name they used to set it up and would they have been required to enter a validation code via a mobile phone number. We already suspect someone but proving it is difficult.