To unblock your Hotmail account you have to see what type of problem has caused the blocking. If you had sent to many mails from your Hotmail account or a single mail to a large number of users in a short period of time, your account can get blocked because Hotmail considers this as violation of its terms of use. If this is the problem you will have to wait for at least 12 hours to get your account unblocked. However if the problem is due to security reasons you can make use of two-step verification check and get back to your account. Get in touch with the Hotmail customer support team if you are not able to unblock your account despite every effort.