In April 2013, Microsoft decided to retire Windows Live Messenger, the old MSN Messenger, in favor of a more advanced communication system consisting of Skype (the popular VoIP software for calls over the Internet) and various online services, such as the Web-Mail Outlook.com. All of these services can be used by logging in with your old MSN account, so you need to protect everything with an extremely effective, hard-to-guess password.
If you haven't already, take five minutes and run straight to your door and find out how to change your MSN password with the instructions I'm going to give you. I know it is a tedious operation, but the use of insecure passwords can cause potential criminals to delete not only your old Messenger account, which is no longer available but also your Skype profile (if you decide to use the program through a Microsoft account) and your Outlook.com email account.