I want to report that my email account has been hacked into and my contact list stolen. I know this because some of my contacts have told me they've had spurious emails with links to websites in them. I have an outlook account with a hotmail email address. I normally access my email via Windows Live Mail. I have changed my password, reverified my account, and warned everyone on my contact list to delete any mail they receive from me that is of this spurious nature. I am concerned about what other personal information may have been stolen. 

Is there any particular person/group/company I should have reported this to?