Direct link to end your mail account. For closing your complete Microsoft account, there is a different link, see: http://www.accountkiller.com/en/delete-microsoft-account
If you can't find any contact info and still wish to ask something, for example a question about what exactly is deleted, about data retention, etc., you may contact the domain owners using this info.
If you signed up for Hotmail / Live using a third-party login such as Facebook or Twitter, you probably want to revoke all access from Hotmail / Live. Click the icon below to find out how.