Question about Outlook Express

Hello, my father's email address has been hacked since Thursday, October 17, 2013 and cannot access his contacts nor his email. The hacker changed the password, contact emails, and is currently sending spam messages to his contacts under his name. The contact emails have an UK address which none of us possess as well as newly registered email account (az*****@hotmail.com). The message that has been sent out is as follows: 

How are you doing? I really did not want to disturb you with this but I had no one else to turn to. I am in Madrid, Spain to see my cousin who lives here. He is critically ill and needs family support. He was diagnosed with Acute Myeloid Leukaemia and has been undergoing treatment since. The chemotherapy treatment was going fine until last week when the doctor noticed that the disease has relapsed and the only way he can survive is by undergoing a BMT (Bone Marrow Transplantation). My sister whose marrow matched his has agreed to be the donor and he shall be undergoing the transplant soon at the Hospital USP San Camilla (Madrid). The estimate for the transplant is $12,000. I have already spent approx. $8,500 towards his treatment. I travelled with little money due to the short time I had to prepare for this trip and I never expected things to be the way it is right now, I need you to support me with a loan of $3,500. I will refund the loan back to you by 29 October 2013, if you can help, please let me know. Since I do not know your financial status at the moment, any amount you can afford to loan out to me will be deeply appreciated. Your help and support will give him a chance to live a normal life once again. There is nothing called a small help when the heart giving it is big. Any amount will be accepted with gratitude and paid back after the surgery. Please let me know how much you can loan to me and I will provide you with the details to get the money.

Regards,

xxx

I have received this message on Tuesday, October 22, 2013. Please disable this account from sending further messages. Additionally, please provide a temporary access link to recover the contacts as well as emails. 

My father has been directed through the online verification process but to no avail. Several service tickets have been opened and closed without resolve. After contacting customer support via phone, they have recommended that I ask a question here and seek the help of the moderator team in order to resolve this issue. He has also raised the question of how he can verify that he is the genuine owner of this said account.